Ford Escape Manuals
Ford Escape 2020-2022 Service Manual / Electrical / Climate Control System / Climate Control System - General Information / Diagnosis and Testing - Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC)/Electronic Automatic Temperature Control (EATC)

Ford Escape: Climate Control System - General Information / Diagnosis and Testing - Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC)/Electronic Automatic Temperature Control (EATC)

Diagnostic Trouble Code (DTC) Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

NOTE: Network communication or missing network DTCs may result from intermittent concerns, such as damaged wiring or low battery voltage occurrences. Additionally, vehicle repair procedures may set these DTCs. To avoid repeat network concerns, follow all Workshop Manual (WSM) guidance for the code. Test the vehicle battery.


  Diagnostic Trouble Code Chart


Module   DTC Description Action
  ACCM B11EE:19 A/C Compressor: Circuit Current Above Threshold   GO to Pinpoint Test AA
  ACCM B11EE:41 A/C Compressor: General Checksum Failure   GO to Pinpoint Test AI
  ACCM B11EE:4B A/C Compressor: Over Temperature   GO to Pinpoint Test AA
  ACCM B11EE:92 A/C Compressor: Performance or Incorrect Operation   GO to Pinpoint Test AA
  ACCM P0562:00 System Voltage Low: No Sub Type Information   GO to Pinpoint Test AA
  ACCM P0563:00 System Voltage High: No Sub Type Information   GO to Pinpoint Test AA
  ACCM P0AFA:16 Hybrid/EV Battery System Voltage Low: Circuit Voltage Below Threshold   GO to Pinpoint Test AA
  ACCM P0AFB:17 Hybrid/EV Battery System Voltage High: Circuit Voltage Above Threshold   GO to Pinpoint Test AA
  ACCM P0AFB:1C Hybrid/EV Battery System Voltage High: Circuit Voltage Out of Range   GO to Pinpoint Test AA
  ACCM U0001:88 High Speed CAN Communication Bus: Bus Off   GO to Pinpoint Test AF
  ACCM U0100:00 Lost Communication with ECM/PCM "A": No Sub Type Information   GO to Pinpoint Test AB
  ACCM U0111:00 Lost Communication With Battery Energy Control Module "A": No Sub Type Information   GO to Pinpoint Test AC
  ACCM U0140:00 Lost Communication With Body Control Module: No Sub Type Information   GO to Pinpoint Test P
  ACCM U3000:04 Control Module: System Internal Failure   GO to Pinpoint Test AI
  ACCM U3000:42 Control Module: General Memory Failure   GO to Pinpoint Test AI
  ACCM U3000:49 Control Module: Internal Electronic Failure   GO to Pinpoint Test AI
  BCMC P2611:00 A/C Refrigerant Distribution Valve "A" Control Circuit/Open: No Sub Type Information   GO to Pinpoint Test AJ
  BCMC P2612:00 A/C Refrigerant Distribution Valve "A" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test AJ
  BCMC P2613:00 A/C Refrigerant Distribution Valve "A" Control Circuit High: No Sub Type Information   GO to Pinpoint Test AJ
  HVAC B1081:07 Left Temperature Damper Motor: Mechanical Failure   GO to Pinpoint Test G
  HVAC B1081:11 Left Temperature Damper Motor: Circuit Short To Ground   GO to Pinpoint Test G
  HVAC B1081:12 Left Temperature Damper Motor: Circuit Short To Battery   GO to Pinpoint Test G
  HVAC B1081:13 Left Temperature Damper Motor: Circuit Open   GO to Pinpoint Test G
  HVAC B1082:07 Right Temperature Damper Motor: Mechanical Failure   GO to Pinpoint Test H
  HVAC B1082:11 Right Temperature Damper Motor: Circuit Short To Ground   GO to Pinpoint Test H
  HVAC B1082:12 Right Temperature Damper Motor: Circuit Short To Battery   GO to Pinpoint Test H
  HVAC B1082:13 Right Temperature Damper Motor: Circuit Open   GO to Pinpoint Test H
  HVAC B1083:07 Recirculation Damper Motor: Mechanical Failure   GO to Pinpoint Test I
  HVAC B1083:11 Recirculation Damper Motor: Circuit Short To Ground   GO to Pinpoint Test I
  HVAC B1083:12 Recirculation Damper Motor: Circuit Short To Battery   GO to Pinpoint Test I
  HVAC B1083:13 Recirculation Damper Motor: Circuit Open   GO to Pinpoint Test I
  HVAC B1086:07 Air Distribution Damper Motor: Mechanical Failure   GO to Pinpoint Test J
  HVAC B1086:11 Air Distribution Damper Motor: Circuit Short To Ground   GO to Pinpoint Test J
  HVAC B1086:12 Air Distribution Damper Motor: Circuit Short To Battery   GO to Pinpoint Test J
  HVAC B1086:13 Air Distribution Damper Motor: Circuit Open   GO to Pinpoint Test J
  HVAC B10AF:11 Blower Fan Relay: Circuit Short To Ground   GO to Pinpoint Test N
  HVAC B10AF:12 Blower Fan Relay: Circuit Short To Battery   GO to Pinpoint Test O
  HVAC B10AF:13 Blower Fan Relay: Circuit Open   GO to Pinpoint Test N
  HVAC B10AF:15 Blower Fan Relay: Circuit Short To Battery or Open   GO to Pinpoint Test N
  HVAC B10AF:15 Blower Fan Relay: Circuit Short To Battery or Open   GO to Pinpoint Test O
  HVAC B10B3:11 Right Panel Air Discharge Temperature: Circuit Short To Ground   GO to Pinpoint Test V
  HVAC B10B3:15 Right Panel Air Discharge Temperature: Circuit Short To Battery or Open   GO to Pinpoint Test V
  HVAC B10B4:11 Right Floor Air Discharge Temperature: Circuit Short To Ground   GO to Pinpoint Test V
  HVAC B10B4:15 Right Floor Air Discharge Temperature: Circuit Short To Battery or Open   GO to Pinpoint Test V
  HVAC B10B5:11 Left Panel Air Discharge Temperature: Circuit Short To Ground   GO to Pinpoint Test V
  HVAC B10B5:15 Left Panel Air Discharge Temperature: Circuit Short To Battery or Open   GO to Pinpoint Test V
  HVAC B10B6:11 Left Floor Air Discharge Temperature: Circuit Short To Ground   GO to Pinpoint Test V
  HVAC B10B6:15 Left Floor Air Discharge Temperature: Circuit Short To Battery or Open   GO to Pinpoint Test V
  HVAC B10B8:63 Push Buttons: Circuit / Component Protection Time-Out   GO to Pinpoint Test Z
  HVAC B10B9:12 Blower Control: Circuit Short To Battery   GO to Pinpoint Test N
  HVAC B10B9:14 Blower Control: Circuit Short To Ground or Open   GO to Pinpoint Test N
  HVAC B10B9:14 Blower Control: Circuit Short To Ground or Open   GO to Pinpoint Test O
  HVAC B11E5:11 Left HVAC Damper Position Sensor: Circuit Short To Ground   GO to Pinpoint Test G
  HVAC B11E5:15 Left HVAC Damper Position Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test G
  HVAC B11E6:11 Right HVAC Damper Position Sensor: Circuit Short To Ground   GO to Pinpoint Test H
  HVAC B11E6:15 Right HVAC Damper Position Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test H
  HVAC B11E7:11 Air Distribution Damper Position Sensor: Circuit Short To Ground   GO to Pinpoint Test J
  HVAC B11E7:15 Air Distribution Damper Position Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test J
  HVAC B11F0:11 Air Intake Damper Position Sensor: Circuit Short To Ground   GO to Pinpoint Test I
  HVAC B11F0:15 Air Intake Damper Position Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test I
  HVAC B12CA:11 Start/Stop "Eco-Start" Status Indicator: Circuit Short To Ground   GO to Pinpoint Test Y
  HVAC B12CA:15 Start/Stop "Eco-Start" Status Indicator: Circuit Short To Battery or Open   GO to Pinpoint Test Y
  HVAC B1A61:11 Cabin Temperature Sensor: Circuit Short To Ground   GO to Pinpoint Test E
  HVAC B1A61:15 Cabin Temperature Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test E
  HVAC B1A63:11 Right Solar Sensor: No Sub Type Information   GO to Pinpoint Test U
  HVAC B1A63:15 Right Solar Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test U
  HVAC B1A64:11 Left Solar Sensor: No Sub Type Information   GO to Pinpoint Test U
  HVAC B1A64:15 Left Solar Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test U
  HVAC B1A69:11 Humidity Sensor: Circuit Short To Ground   GO to Pinpoint Test E
  HVAC B1A69:15 Humidity Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test E
  HVAC B1A69:92 Humidity Sensor: Performance or Incorrect Operation   GO to Pinpoint Test E
  HVAC B1B71:11 Evaporator Temperature Sensor: Circuit Short To Ground   GO to Pinpoint Test F
  HVAC B1B71:15 Evaporator Temperature Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test F
  HVAC C1B14:11 Sensor Supply Voltage A: Circuit Short to Ground   GO to Pinpoint Test X
  HVAC C1B14:12 Sensor Supply Voltage A: Circuit Short to Battery   GO to Pinpoint Test X
  HVAC U0100:00 Lost Communication with ECM/PCM "A": No Sub Type Information   GO to Pinpoint Test AB
  HVAC U0140:00 Lost Communication With Body Control Module: No Sub Type Information   GO to Pinpoint Test P
  HVAC U0151:00 Lost Communication With Restraints Control Module: No Sub Type Information   GO to Pinpoint Test Q
  HVAC U0155:00 Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub-Type Information   GO to Pinpoint Test R
  HVAC U0253:00 Lost Communication With Accessory Protocol Interface Module: No Sub Type Information   GO to Pinpoint Test S
  HVAC U0401:00 Invalid Data Received from ECM/PCM A: No Sub-Type Information   GO to Pinpoint Test AG
  HVAC U0401:82 Invalid Data Received from ECM/PCM A: Alive / Sequence Counter Incorrect / Not Updated   GO to Pinpoint Test AG
  HVAC U0422:68 Invalid Data Received from Body Control Module: Event Information   GO to Pinpoint Test AG
  HVAC U0422:81 Invalid Data Received from Body Control Module: Invalid Serial Data Received   GO to Pinpoint Test AG
  HVAC U0452:82 Invalid Data Received From Restraints Control Module: Alive / Sequence Counter Incorrect / Not Updated   GO to Pinpoint Test AG
  HVAC U1000:00 Solid State Driver Protection Active -Driver Disabled: No Sub Type Information   GO to Pinpoint Test T
  HVAC U2024:51 Control Module Cal-Config Data: Not Programmed   GO to Pinpoint Test AH
  HVAC U2100:00 Initial Configuration Not Complete: No Sub Type Information   GO to Pinpoint Test AH
  HVAC U3000:41 Control Module: General Checksum Failure   GO to Pinpoint Test AI
  HVAC U3000:49 Control Module: Internal Electronic Failure   GO to Pinpoint Test AI
  HVAC U3003:16 Battery Voltage: Circuit Voltage Below Threshold   GO to Pinpoint Test AD
  HVAC U3003:17 Battery Voltage: Circuit Voltage Above Threshold   GO to Pinpoint Test AE
  PCM P0532:00 A/C Refrigerant Pressure Sensor A Circuit Low: No Sub Type Information   GO to Pinpoint Test A
  PCM P0533:00 A/C Refrigerant Pressure Sensor A Circuit High: No Sub Type Information   GO to Pinpoint Test A
  PCM P0645:00 A/C Clutch Relay Control Circuit: No Sub Type Information   GO to Pinpoint Test B
  PCM P06A0:00 Variable Compressor Control Circuit: No Sub Type Information   GO to Pinpoint Test C
  PCM P1464:00 A/C Demand Out Of Self Test Range: No Sub Type Information   GO to Pinpoint Test M
  PCM P193E:00 A/C Clutch Request Signal: No Sub Type Information   GO to Pinpoint Test W
  PCM P2183:00 Engine Coolant Temperature Sensor 2: Circuit Range/Performance   GO to Pinpoint Test AQ
  PCM P2184:00 Engine Coolant Temperature Sensor 2: Circuit Low   GO to Pinpoint Test AQ
  PCM P2185:00 Engine Coolant Temperature Sensor 2: Circuit High   GO to Pinpoint Test AQ
  PCM P2186:00 Engine Coolant Temperature Sensor 2: Circuit Intermittent/Erratic   GO to Pinpoint Test AQ
  PCM P2600:00 Coolant Pump "A" Control Circuit/Open: No Sub Type Information   GO to Pinpoint Test D
  PCM P2601:00 Coolant Pump "A" Control Circuit Performance/Stuck Off: No Sub Type Information   GO to Pinpoint Test D
  PCM P2602:00 Coolant Pump "A" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test D
  PCM P2603:00 Coolant Pump "A" Control Circuit High: No Sub Type Information   GO to Pinpoint Test D
  PCM P26BD:00 Engine Coolant Bypass "D" Control Circuit Open: No Sub Type Information   GO to Pinpoint Test AR
  PCM P26BE:00 Engine Coolant Bypass "D" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test AR
  PCM P26BF:00 Engine Coolant Bypass "D" Control Circuit High: No Sub Type Information   GO to Pinpoint Test AR
  PCM P26C1:00 Engine Coolant Bypass "D" Range Performance: No Sub Type Information   GO to Pinpoint Test AR
  SOBDMC P01EB:96 Engine Coolant Heater "A" Control Circuit Performance: Component Internal Failure   GO to Pinpoint Test AP
  SOBDMC P0531:00 A/C Refrigerant Pressure Sensor "A" Circuit Range/Performance: No Sub Type Information   GO to Pinpoint Test A
  SOBDMC P0534:00 A/C Refrigerant Charge Loss: No Sub Type Information   GO to Pinpoint Test A
  SOBDMC P0D6D:00 A/C Compressor Motor Voltage "A" Low: No Sub Type Information   GO to Pinpoint Test AA
  SOBDMC P0D6F:00 A/C Compressor Motor Current High: No Sub Type Information   GO to Pinpoint Test AA
  SOBDMC P0D71:00 A/C Compressor Control Module Internal Temperature Sensor Performance: No Sub Type Information   GO to Pinpoint Test AA
  SOBDMC P2611:00 A/C Refrigerant Distribution Valve "A" Control Circuit/Open: No Sub Type Information   GO to Pinpoint Test AJ
  SOBDMC P2612:00 A/C Refrigerant Distribution Valve "A" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test AJ
  SOBDMC P2613:00 A/C Refrigerant Distribution Valve "A" Control Circuit High: No Sub Type Information   GO to Pinpoint Test AJ
  SOBDMC P26FD:00 A/C Compressor Internal Control Module Performance: No Sub Type Information   GO to Pinpoint Test AA
  SOBDMC P2D41:00 A/C Compressor Motor Voltage "B" Performance: No Sub Type Information   GO to Pinpoint Test AA
  SOBDMC P2D42:00 A/C Compressor Motor Voltage "B" Low: No Sub Type Information   GO to Pinpoint Test AA
  SOBDMC P2D44:00 A/C Compressor Motor Performance: No Sub Type Information   GO to Pinpoint Test AA
  SOBDMC P2DA4:00 Coolant Heater "A" Internal Control Module Performance: No Sub Type Information   GO to Pinpoint Test AP
  SOBDMC P2DA5:00 Coolant Heater "A" Supply Voltage Circuit: No Sub Type Information   GO to Pinpoint Test AP
  SOBDMC P2DA6:00 Coolant Heater "A" Over Temperature: No Sub Type Information   GO to Pinpoint Test AS
  SOBDMC P2DA7:00 Coolant Heater "A" Internal Control Module Control Module System Voltage: No Sub Type Information   GO to Pinpoint Test AP
  SOBDMC U069E:81 Lost Communication With Coolant Heater "A": Invalid Serial Data Received   GO to Pinpoint Test AP
  SOBDMC U069E:87 Lost Communication With Coolant Heater "A": Missing Messages   GO to Pinpoint Test AP

Global Customer Symptom Code (GCSC) Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).


Symptom Action
Comfort & Entertainment > Climate Control > Air Distribution > Inaccurate GO to Pinpoint Test G
Comfort & Entertainment > Climate Control > Air Distribution > Inaccurate GO to Pinpoint Test H
Comfort & Entertainment > Climate Control > Air Distribution > Inaccurate GO to Pinpoint Test O
Comfort & Entertainment > Climate Control > Air Distribution > Inaccurate GO to Pinpoint Test AN
Comfort & Entertainment > Climate Control > Air Distribution > Inoperative GO to Pinpoint Test N
Comfort & Entertainment > Climate Control > Function/Operation > Poor Heating GO to Pinpoint Test K
Comfort & Entertainment > Climate Control > Function/Operation > Poor Heating GO to Pinpoint Test AL
Comfort & Entertainment > Climate Control > Function/Operation > Poor Heating GO to Pinpoint Test AT
Comfort & Entertainment > Climate Control > Function/Operation > Poor Cooling GO to Pinpoint Test C
Comfort & Entertainment > Climate Control > Function/Operation > Poor Cooling GO to Pinpoint Test L
Comfort & Entertainment > Climate Control > Function/Operation > Poor Cooling GO to Pinpoint Test AM
Comfort & Entertainment > Climate Control > Function/Operation > Poor Cooling GO to Pinpoint Test AU
Comfort & Entertainment > Climate Control > Function/Operation > Inoperative GO to Pinpoint Test G
Comfort & Entertainment > Climate Control > Function/Operation > Inoperative GO to Pinpoint Test H
Comfort & Entertainment > Climate Control > Function/Operation > Inoperative GO to Pinpoint Test N
Comfort & Entertainment > Noise > Climate Control > Always GO to Pinpoint Test AO
Safe & Secure > Smoke/Odor > Underhood > Hot GO to Pinpoint Test AK

Symptom Charts

Symptom Chart – Climate Control Systems

NOTE: Some Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs) may inhibit Air Conditioning (A/C) operation. If any Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs) are retrieved, diagnose those first. Refer to the Diagnostic Trouble Code (DTC) Chart.

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Condition Actions
A module does not respond to the diagnostic scan tool  
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).
Externally Controlled Variable Displacement Compressor (EVDC) Performance Check with or without DTC P06A0   GO to Pinpoint Test C
Insufficient Air Conditioning (A/C) cooling   GO to Pinpoint Test AM
The A/C is always on — A/C mode always commanded on NON HEV   GO to Pinpoint Test M
The A/C is inoperative - No Diagnostic Trouble Codes (DTCs) - NON HEV   GO to Pinpoint Test L
The A/C pressure relief valve is discharging   GO to Pinpoint Test AK
ACCM A/C ELECTRIC COMPRESSOR INOPERATIVE   GO to Pinpoint Test AA
The air inlet door is inoperative   GO to Pinpoint Test I
The blower motor is inoperative   GO to Pinpoint Test N
The blower motor does not operate correctly   GO to Pinpoint Test O
Incorrect or erratic direction of airflow from outlets   GO to Pinpoint Test J
Insufficient, erratic or no heat with no diagnostic trouble codes (DTCS) - except plug-in hybrid electric vehicles   GO to Pinpoint Test K
Insufficient, erratic or no heat with no diagnostic trouble codes (DTCS) - plug-in hybrid electric vehicles   GO to Pinpoint Test AT
Reduced outlet airflow   GO to Pinpoint Test AN
The temperature control is inoperative or does not operate correctly – driver side   GO to Pinpoint Test G
The temperature control is inoperative or does not operate correctly – passenger side   GO to Pinpoint Test H
The electric booster heater is inoperative or does not operate correctly   GO to Pinpoint Test AL
A/C System NVH   GO to Pinpoint Test AO
Refrigerant leak detection   GO to Pinpoint Test AU

Pinpoint Tests


PINPOINT TEST A: P0531, P0532, P0533, P0534

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

A/C Pressure Transducer, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
SOBDMC P0531:00 A/C Refrigerant Pressure Sensor 'A' Circuit Range/Performance: No Sub Type Information The A/C pressure transducer inputs a feedback voltage to the SOBDMC . This DTC sets if the feedback voltage is lower than expected.
PCM P0532:00 A/C Refrigerant Pressure Sensor 'A' Circuit Low: No Sub Type Information The A/C pressure transducer inputs a feedback voltage to the PCM . This DTC sets if the feedback voltage is lower than expected.
PCM P0533:00 A/C Refrigerant Pressure Sensor 'A' Circuit High: No Sub Type Information The A/C pressure transducer inputs a feedback voltage to the PCM . This DTC sets if the feedback voltage is greater than expected.
SOBDMC P0534:00 A/C Refrigerant System 'A' Charge Loss: No Sub Type Information The A/C pressure transducer inputs a feedback voltage to the SOBDMC . This DTC sets if the feedback voltage is lower than expected.

Possible Sources

  • Wiring, terminals or connectors
  • A/C pressure transducer
  • PCM or SOBDMC

Visual Inspection and Pre-checks

  • Inspect for loose or corroded A/C pressure transducer connections.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

A1 COMPARE THE PCM (POWERTRAIN CONTROL MODULE) PRESSURE SENSOR (ACP_PRESS) PID (PARAMETER IDENTIFICATION) WITH THE MANIFOLD GAUGE SET READINGS

NOTE: The following pinpoint test step is tested in ambient temperature of approximately 21.1°C (70°F). As ambient temperatures near 38°C (100.4°F), the pressure value difference increases above ± 15 psi (103 kPa) range

  • Allow the A/C system to stabilize to the outside ambient temperature.
  • Ignition ON.
  • Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).
  • With the manifold gauge set connected, compare the pressure readings of the manifold gauge set and the PCM ACP_PRESS PID .

Are the pressure values of the manifold gauge set and the ACP_PRESS PCM PID , dependent upon the ambient temperatures, within ± 103 kPa (15 psi)?
Yes If DTC P0534:00 is present, or refrigerant pressures are low, INSPECT the A/C system for a leak. GO to Pinpoint Test AU
IGNORE the Diagnostic Trouble Codes (DTCs). REFER to the Symptom Chart in this section.
No GO to A2

A2 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect PCM C175B (1.5L), C1551B (2.0L) or C1381B (2.5L).
  • Disconnect A/C pressure transducer C1260 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1260-1   Ground
      C1260-2   Ground
      C1260-3   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to A3

A3 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1260-1   Ground
      C1260-2   Ground
      C1260-3   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to A4
No REPAIR the circuit.

A4 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors

      1.5L


    Positive Lead Measurement / Action Negative Lead
      C1260-1   C175B-26
      C1260-2   C175B-30
      C1260-3   C175B-13

    Click to display connectors

      2.0L


    Positive Lead Measurement / Action Negative Lead
      C1260-1   C1551B-26
      C1260-2   C1551B-30
      C1260-3   C1551B-13

    Click to display connectors

      2.5L


    Positive Lead Measurement / Action Negative Lead
      C1260-1   C1381B-30
      C1260-2   C1381B-44
      C1260-3   C1381B-29

Are the resistances less than 3 ohms?
Yes GO to A5
No REPAIR the circuit.

A5 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR CIRCUITS FOR A SHORT TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1260-1   C1260-2
      C1260-1   C1260-3
      C1260-2   C1260-3

Are the resistances greater than 10,000 ohms?
Yes INSTALL a new A/C pressure transducer.
REFER to: Air Conditioning (A/C) Pressure Transducer - 1.5L EcoBoost (132kW/180PS) – I3 (Y1) (412-00 Climate Control System - General Information, Removal and Installation).
REFER to: Air Conditioning (A/C) Pressure Transducer - 2.0L EcoBoost (177kW/240PS) – MI4 (412-00 Climate Control System - General Information, Removal and Installation).
REFER to: Air Conditioning (A/C) Pressure Transducer - 2.5L Duratec – Hybrid (121kW/164PS) (BG) (412-00 Climate Control System - General Information, Removal and Installation).
CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the PCM self-test. TEST the system for normal operation. If the concern is still present, GO to A6
No REPAIR the circuits.

A6 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all PCM electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all PCM electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,
   VIN required to access Guided Routine (PCM)
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST B: P0645:00

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

When A/C is requested and A/C line pressures allow, the PCM grounds the clutch control circuit that is hardwired to the A/C clutch control input processing in the BCMC . For additional information on A/C Request, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0645:00 A/C Clutch Relay Control Circuit: No Sub Type Information Sets when the PCM grounds the relay circuit and more current than expected is detected on the relay circuit. The DTC also sets when the relay circuit is off and voltage is detected on the relay circuit.

Possible Sources

  • Fuse
  • Wiring, terminals or connectors
  • A/C clutch relay (non-serviceable, part of the BJB )
  • PCM

Visual Inspection and Pre-checks

  • Make sure BJB fuse 12 (10A) is OK

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

B1 CHECK THE A/C (AIR CONDITIONING) CLUTCH RELAY COIL CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect PCM C175B (1.5L) or C1551B (2.0L).
  • Disconnect BJB C1035A .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1035A-3   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to B2

B2 CHECK THE A/C (AIR CONDITIONING) CLUTCH RELAY COIL CONTROL CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1035A-3   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to B3
No REPAIR the circuit.

B3 CHECK THE A/C (AIR CONDITIONING) CLUTCH RELAY COIL CONTROL CIRCUIT FOR AN OPEN
  • For vehicles equipped with a 1.5L engine, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1035A-3   C175B-62
  • For vehicles equipped with a 2.0L engine, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1035A-3   C1551B-62

Is the resistance less than 3 ohms?
Yes CLEAR codes and CARRY OUT the PCM self-test. If the concern is still present, GO to B4
No REPAIR the circuit.

B4 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all PCM electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all PCM electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,
   VIN required to access Guided Routine (PCM)
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST C: EXTERNALLY CONTROLLED VARIABLE DISPLACEMENT COMPRESSOR (EVDC) PERFORMANCE CHECK WITH OR WITHOUT DTC (DIAGNOSTIC TROUBLE CODE) P06A0

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The externally controlled variable displacement compressor is electronically controlled by the PCM . The PCM pulse width modulates the ground to the externally controlled variable displacement compressor to change the displacement of the A/C compressor. REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P06A0:00 Variable A/C Compressor Control Circuit: No Sub Type Information This DTC sets when the PCM senses unexpected voltage on the sensor feedback circuit, indicating a short to voltage, an open circuit or an open sensor.

Possible Sources

  • Fuse
  • Wiring, terminals or connectors
  • Low refrigerant charge
  • A/C compressor
  • PCM

Visual Inspection and Pre-checks

  • Inspect for loose or corroded A/C compressor connections.
  • Make sure BJB fuse 8 (15A) is OK.
  • Verify the A/C compressor belt is OK.
  • Verify the A/C compressor clutch is engaged/operating.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

C1 EXTERNALLY CONTROLLED VARIABLE DISPLACEMENT COMPRESSOR (EVDC) PERFORMANCE CHECK WITH THE AC COMPRESSOR ELECTRONIC CONTROL VALVE TESTER

NOTE: Make sure the Air Conditioning (A/C) Compressor clutch is on or is engaged in this step.

NOTE: Proper Air Conditioning (A/C) system diagnosis on a vehicle's compressor is dependent on correct refrigerant system charge and tested in ambient temperatures above 21.1°C (70°F).

NOTE: Make sure the EVDC100 Tester, the EVDC101 valve harness module, (and the connector adapter EVDC102, if required) are properly connected per the instruction manual and the operation video.

  • Test the EVDC compressor displacement, following the instructions in the user manual supplied with the Model EVDC®100 A/C Compressor Electronic Control Valve Tester and the EVDC 100 Tester Operation video found on the Ford PTS Home tab, Technical Support Videos.

Did the suction low side pressure decrease or the high side pressure increase?
Yes The Externally Controlled Variable Displacement Compressor (EVDC) is able to change the displacement. Do not replace the compressor.
If DTC P06A0 is present, GO to C2
If DTC P06A0 is not present, CHECK refrigerant charge amount.
REFER to: Refrigerant System Tests - 1.5L EcoBoost (132kW/180PS) – I3 (Y1) (412-00 Climate Control System - General Information, General Procedures).
REFER to: Refrigerant System Tests - 2.0L EcoBoost (177kW/240PS) – MI4 (412-00 Climate Control System - General Information, General Procedures).
No If the A/C compressor clutch does not operate, GO to Pinpoint Test L
If the A/C compressor clutch was on or engaged, GO to C2

C2 CHECK FOR VOLTAGE TO THE A/C (AIR CONDITIONING) COMPRESSOR CONTROL SOLENOID
  • Ignition OFF.
  • Disconnect Externally Controlled Variable Displacement Compressor (EVDC) C100B .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C100B-2   Ground

Is the voltage greater than 11 volts?
Yes GO to C3
No VERIFY BJB fuse 8 (15A) is OK.
If OK, REPAIR the circuit.
If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

C3 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR DISPLACEMENT CONTROL VALVE CIRCUIT FOR A SHORT TO VOLTAGE
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C100B-1   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to C4

C4 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR DISPLACEMENT CONTROL VALVE CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Disconnect PCM C175B (1.5L) or C1551B (2.0L).
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C100B-1   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to C5
No REPAIR the circuit.

C5 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR DISPLACEMENT CONTROL VALVE CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Measure:
    Click to display connectors

      1.5L


    Positive Lead Measurement / Action Negative Lead
      C100B-1   C175B-59

    Click to display connectors

      2.0L


    Positive Lead Measurement / Action Negative Lead
      C100B-1   C1551B-59

Is the resistance less than 3 ohms?
Yes If the Externally Controlled Variable Displacement Compressor (EVDC) is able to change the displacement as tested in step 1, Do Not Replace the compressor. CLEAR the DTC and REPEAT the PCM self-test. If the DTC returns, GO to C6
If the Externally Controlled Variable Displacement Compressor (EVDC) is not able to change the displacement as tested in step 1 , CLEAR the DTC and GO to C7
CLEAR the DTC and REPEAT the PCM self-test. If the DTC returns, GO to C6
No REPAIR the circuit.

C6 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all PCM electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all PCM electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,
   VIN required to access Guided Routine (PCM)
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

C7 CHECK AIR CONDITIONING COMPRESSOR CONNECTOR PINS
  • Ignition OFF.
  • Disconnect and inspect all electrical connectors on the compressor
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all Compressor electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new A/C compressor.
REFER to: Air Conditioning (A/C) Compressor - 1.5L EcoBoost (132kW/180PS) – I3 (Y1) (412-00 Climate Control System - General Information, Removal and Installation).
REFER to: Air Conditioning (A/C) Compressor - 2.0L EcoBoost (177kW/240PS) – MI4 (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST D: P2600:00, P2601:00, P2602:00, P2603:00

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Cabin Heater Coolant Pump, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P2600:00 Coolant Pump 'A' Control Circuit/Open: No Sub Type Information This DTC sets when the PCM senses an open on the cabin heater coolant pump circuits.
PCM P2601:00 Coolant Pump 'A' Control Circuit Performance/Stuck Off: No Sub Type Information
  • This DTC sets when the PCM senses any of the following conditions:
  • Dry-Run leads to cabin heater coolant pump running without resistance
  • Over Temperature
  • Over/Under Voltage
  • Impeller Stall
  • Impeller Speed below minimum speed
  • Internal Error
  • Pump communication signal unrecognized
PCM P2602:00 Coolant Pump 'A' Control Circuit Low: No Sub Type Information This DTC sets when the PCM senses low voltage on the PWM circuit when commanding it, indicating a short to ground to the cabin heater coolant pump.
PCM P2603:00 Coolant Pump 'A' Control Circuit High: No Sub Type Information This DTC sets when the PCM senses high voltage on the PWM circuit when commanding it, indicating an open circuit to the cabin heater coolant pump.

Possible Sources

  • Wiring, terminals or connectors
  • Low coolant or air in the coolant system
  • Cabin heater coolant pump
  • PCM

Visual Inspection and Pre-checks

  • Make sure BJB fuse 8 (15A) is OK.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

D1 CHECK THE ENGINE COOLANT LEVEL

NOTE: Allow the engine to cool before checking the engine coolant level.

  • Make sure that the vehicle is on a level surface.
  • Make sure that the steering wheel is set to the straight ahead position.
  • Ignition OFF.
  • Visually inspect the engine coolant level at the degas bottle.

Is the coolant level within specifications?
Yes GO to D2
No DIAGNOSE the low coolant condition.
REFER to: Engine Cooling (303-03A Engine Cooling - 1.5L EcoBoost (132kW/180PS) – I3 (Y1), Diagnosis and Testing).
, REFER to: Engine Cooling (303-03B Engine Cooling - 2.0L EcoBoost (177kW/240PS) – MI4, Diagnosis and Testing).
or REFER to: Engine Cooling (303-03C Engine Cooling, Diagnosis and Testing).

D2 CHECK FOR AND CLEAR PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES AND COMMAND THE CABIN HEATER COOLANT PUMP ON
  • Ignition ON.
  • Using a diagnostic scan tool, CARRY OUT the PCM self-test. Record the PCM Diagnostic Trouble Codes (DTCs). CLEAR all PCM Diagnostic Trouble Codes (DTCs).
  • Using the diagnostic scan tool, active command the cabin heater coolant pump on and allow it to run for a minimum of 5 minutes and monitor the status of the cabin heater coolant pump status PID . Confirm if the cabin heater coolant pump is running by feeling or hearing the pump for vibration.
  • Access the  PCM  and control the  COOLANT_PMP_A  PID

  • Access the  PCM  and monitor the  COOLPMP_A_STAT  PID


Is DTC P2600, P2601, P2602 or P2603 received or is the coolant pump not running?
Yes GO to D3
No GO to D6

D3 CHECK THE CABIN HEATER COOLANT PUMP CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect BJB fuse 8 (15A).
  • Disconnect PCM C175B (1.5L), C1551B (2.0L) or C1381B (2.5L).
  • Disconnect Cabin heater coolant pump C1030 (1.5L/2.0L).
  • Disconnect Cabin heater coolant pump C163 (2.5L).
  • Ignition ON.
  • Measure:
    Click to display connectors

      1.5L/2.0L


    Positive Lead Measurement / Action Negative Lead
      C1030-2   Ground
      C1030-3   Ground

    Click to display connectors

      2.5L


    Positive Lead Measurement / Action Negative Lead
      C163-2   Ground
      C163-3   Ground

Is there any voltage present?
Yes REPAIR the circuit.
No GO to D4

D4 CHECK THE CABIN HEATER COOLANT PUMP CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors

      1.5L/2.0L


    Positive Lead Measurement / Action Negative Lead
      C1030-2   Ground
      C1030-3   Ground

    Click to display connectors

      2.5L


    Positive Lead Measurement / Action Negative Lead
      C163-2   Ground
      C163-3   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to D5
No REPAIR the circuit.

D5 CHECK THE CABIN HEATER COOLANT PUMP CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors

      1.5L/2.0L


    Positive Lead Measurement / Action Negative Lead
      C1030-1   Ground

    Click to display connectors

      1.5L


    Positive Lead Measurement / Action Negative Lead
      C1030-3   C175B-20

    Click to display connectors

      2.0L


    Positive Lead Measurement / Action Negative Lead
      C1030-3   C1551B-20

    Click to display connectors

      2.5L


    Positive Lead Measurement / Action Negative Lead
      C163-1   Ground

    Click to display connectors

      2.5L


    Positive Lead Measurement / Action Negative Lead
      C163-2 BJB fuse 8 (15A) socket (component side)

    Click to display connectors

      2.5L


    Positive Lead Measurement / Action Negative Lead
      C163-3   C1381B-28

Are the resistances less than 3 ohms?
Yes GO to D6
No REPAIR the circuit.

D6 CHECK FOR CORRECT CABIN HEATER COOLANT PUMP OPERATION
  • Ignition OFF.
  • Disconnect Cabin heater coolant pump C163 .
  • Repair:
    • corrosion (replace connector or terminals – clean module pins)
    • damaged or bent pins – replace terminals/pins
    • pushed-out pins – replace pins as necessary
  • Connect all disconnected connectors-components. Make sure they seat and latch correctly.
  • Ignition ON.
  • Using a diagnostic scan tool, CLEAR all PCM Diagnostic Trouble Codes (DTCs) and CARRY OUT the PCM self-test.
  • Using the diagnostic scan tool, active command the cabin heater coolant pump on and allow it to run for a minimum of 5 minutes and monitor the status of the cabin heater coolant pump status PID . Confirm if the cabin heater coolant pump is running by feeling or hearing the pump for vibration.
  • Access the  PCM  and control the  COOLANT_PMP_A  PID

  • Access the  PCM  and monitor the  COOLPMP_A_STAT  PID


Does the cabin heater coolant pump run?
Yes If the cabin heater coolant pump runs for 10 seconds on and 10 seconds off for the first 2 minutes, and tries to restart every 10 seconds, BLEED the air from the coolant system. REFER to the appropriate Engine Cooling System Draining, Vacuum Filling and Bleeding General Procedure in Group 303-03.
If the cabin coolant pump runs continuously, the system is operating correctly at this time. The concern may have been caused by pump connections. ADDRESS the root cause of any connector or pin issues.
No INSTALL a new cabin heater coolant pump.
REFER to: Cabin Heater Coolant Pump - 1.5L EcoBoost (132kW/180PS) – I3 (Y1) (412-00 Climate Control System - General Information) .
REFER to: Cabin Heater Coolant Pump - 2.0L EcoBoost (177kW/240PS) – MI4 (412-00 Climate Control System - General Information) .
REFER to: Cabin Heater Coolant Pump (412-03 Supplemental Climate Control, Removal and Installation). CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the PCM self-test. TEST the system for normal operation. If the concern is still present, GO to D7

D7 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the PCM connectors.
  • Repair:
    • corrosion (replace connector or terminals – clean module pins)
    • damaged or bent pins – replace terminals/pins
    • pushed-out pins – replace pins as necessary
  • Connect the PCM connectors. Make sure they seat and latch correctly.
  • Operate the system and verify the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,
   VIN required to access Guided Routine (PCM)
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST E: B1A61:11, B1A61;15, B1A69:11, B1A69:15, B1A69:92

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

In-Vehicle Temperature and Humidity Sensor, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC B1A61:11 Cabin Temperature Sensor: Circuit Short To Ground Module senses lower than expected voltage on the temperature sensor feedback circuit, indicating a short to ground.
HVAC B1A61:15 Cabin Temperature Sensor: Circuit Short To Battery Or Open Module senses unexpected voltage on the circuit for the cabin temperature sensor.
HVAC B1A69:11 Humidity Sensor: Circuit Short To Ground Module senses no voltage on the circuit for the humidity sensor, indicating a short to ground.
HVAC B1A69:15 Humidity Sensor: Circuit Short To Battery Or Open Module senses a short to battery or an open for the humidity sensor.
HVAC B1A69:92 Humidity Sensor: Performance Or Incorrect Operation Module senses the wrong humidity sensor value.

Possible Sources

  • Wiring, terminals or connectors
  • In-vehicle temperature and humidity sensor
  • HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

E1 CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect HVAC control module C228A .
  • Disconnect HVAC control module C228B .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228B-29   Ground
      C228B-25   Ground
      C228B-19   Ground
      C228B-26   Ground

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-3   Ground
      C228A-2   Ground

Is any voltage present?
Yes REPAIR the circuit in question.
No GO to E2

E2 CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228B-29   Ground
      C228B-25   Ground
      C228B-19   Ground
      C228B-26   Ground

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-3   Ground
      C228A-2   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to E3
No REPAIR the circuit in question.

E3 CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR CIRCUITS FOR AN OPEN CIRCUIT
  • Disconnect In-vehicle temperature and humidity sensor C910 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228B-29   C910-1
      C228B-25   C910-2
      C228B-19   C910-4
      C228B-26   C910-6

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-3   C910-3
      C228A-2   C910-5

Are the resistances less than 3 ohms?
Yes INSTALL a new in-vehicle temperature and humidity sensor.
REFER to: In-Vehicle Temperature and Humidity Sensor (412-00 Climate Control System - General Information, Removal and Installation).
CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the HVAC control module self-test. TEST the system for normal operation. If the concern is still present, GO to E4
No REPAIR the circuit in question.

E4 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST F: B1B71:11, B1B71:15

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Evaporator Temperature Sensor, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC B1B71:11 Evaporator Temperature Sensor: Circuit Short To Ground Module senses lower than expected voltage on the sensor feedback circuit, indicating a short to ground.
HVAC B1B71:15 Evaporator Temperature Sensor: Circuit Short To Battery Or Open Module senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage or an open circuit or sensor.

Possible Sources

  • Wiring, terminals or connectors
  • Evaporator temperature sensor
  • HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

F1 CHECK THE EVAPORATOR TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect HVAC control module C228A .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-2   Ground
      C228A-19   Ground

Is any voltage present?
Yes REPAIR the circuit in question.
No GO to F2

F2 CHECK THE EVAPORATOR TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-2   Ground
      C228A-19   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to F3
No REPAIR the circuit in question.

F3 CHECK THE EVAPORATOR TEMPERATURE SENSOR CIRCUITS FOR AN OPEN
  • Disconnect Evaporator temperature sensor C296 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-2   C296-1
      C228A-19   C296-2

Are the resistances less than 3 ohms?
Yes GO to F4
No REPAIR the circuit in question.

F4 CHECK THE EVAPORATOR TEMPERATURE SENSOR CIRCUITS FOR A SHORT TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C296-1   C296-2

Is the resistance greater than 10,000 ohms?
Yes INSTALL a new evaporator temperature sensor.
REFER to: Evaporator Temperature Sensor (412-00 Climate Control System - General Information, Removal and Installation).
CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the HVAC control module self-test. TEST the system for normal operation. If the concern is still present, GO to F5
No REPAIR the circuits.

F5 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST G: THE TEMPERATURE CONTROL IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY - DRIVER SIDE

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Temperature Door Actuator - Driver Side, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

During an actuator calibration cycle, the HVAC control module drives the temperature door until the door reaches both internal stops in the HVAC case. If the temperature blend door is temporarily obstructed or binding during a calibration cycle, the HVAC control module can interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be the expected temperature.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC B1081:07 Left Temperature Damper Motor: Mechanical Failures Module senses the temperature door actuator motor control is awake, no actuator drive, stall before achieving target position within 15 seconds.
HVAC B1081:11 Left Temperature Damper Motor: Circuit Short To Ground Module senses lower the expected voltage on the temperature door actuator motor circuit when voltage is applied to drive the motor, indicating a short to ground. The motor can move only in one direction.
HVAC B1081:12 Left Temperature Damper Motor: Circuit Short To Battery Module senses a short to voltage on the temperature door actuator circuits when motor movement is commanded.
HVAC B1081:13 Left Temperature Damper Motor: Circuit Open Module senses an open on the temperature door actuator circuits when motor movement is commanded.
HVAC B11E5:11 Left HVAC Damper Position Sensor: Circuit Short To Ground Module senses a short to ground on the temperature door actuator circuits when motor movement is commanded.
HVAC B11E5:15 Left HVAC Damper Position Sensor: Circuit Short To Battery Or Open Module senses a short to voltage or an open on the temperature door actuator circuits when motor movement is commanded.

Possible Sources

  • Wiring, terminals or connectors
  • Temperature blend door actuator
  • Temperature blend door is binding, stuck or slipping
  • HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

G1 CHECK THE DRIVER SIDE TEMPERATURE DOOR ACTUATOR CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect HVAC control module C228A .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-9   Ground
      C228A-2   Ground
      C228A-3   Ground
      C228A-10   Ground
      C228A-8   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to G2

G2 CHECK THE DRIVER SIDE TEMPERATURE DOOR ACTUATOR CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-9   Ground
      C228A-2   Ground
      C228A-3   Ground
      C228A-10   Ground
      C228A-8   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to G3
No REPAIR the circuit.

G3 CHECK THE DRIVER SIDE TEMPERATURE DOOR ACTUATOR CIRCUITS FOR AN OPEN
  • Disconnect Driver side temperature door actuator C2091 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-9   C2091-1
      C228A-2   C2091-2
      C228A-3   C2091-3
      C228A-10   C2091-4
      C228A-8   C2091-6

Are the resistances less than 3 ohms?
Yes GO to G4
No REPAIR the circuit.

G4 CHECK THE DRIVER SIDE TEMPERATURE DOOR ACTUATOR POWER CIRCUIT FOR VOLTAGE
  • Connect HVAC control module C228A .
  • Ignition ON.
  • On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2091-3   Ground

Is any voltage present?
Yes GO to G5
No GO to Pinpoint Test X

G5 CHECK FOR CORRECT ACTUATOR OPERATION
  • Ignition OFF.
  • Disconnect and inspect the driver side temperature door actuator connector (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminals – clean module pins)
    • damaged or bent pins – install new terminals/pins
    • pushed-out pins – install new pins as necessary
  • Reconnect all disconnected connectors. CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes INSTALL a new driver side temperature door actuator.
REFER to: Temperature Door Actuator (412-00 Climate Control System - General Information, Removal and Installation).
CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the HVAC control module self-test. TEST the system for normal operation. If the concern is still present, GO to G6
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

G6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST H: THE TEMPERATURE CONTROL IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY - PASSENGER SIDE

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Temperature Door Actuator - Passenger Side, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

During an actuator calibration cycle, the HVAC control module drives the temperature door until the door reaches both internal stops in the HVAC case. If the temperature door is temporarily obstructed or binding during a calibration cycle, the HVAC control module can interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be the expected temperature.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC B1082:07 Right Temperature Damper Motor: Mechanical Failures Module senses the temperature door actuator motor control is awake, no actuator drive, stall before achieving target position within 15 seconds.
HVAC B1082:11 Right Temperature Damper Motor: Circuit Short To Ground Module senses lower the expected voltage on the temperature door actuator motor circuit when voltage is applied to drive the motor, indicating a short to ground. The motor can move only in one direction.
HVAC B1082:12 Right Temperature Damper Motor: Circuit Short To Battery Module senses a short to voltage on the temperature door actuator circuits when motor movement is commanded.
HVAC B1082:13 Right Temperature Damper Motor: Circuit Open Module senses an open on the temperature door actuator circuits when motor movement is commanded.
HVAC B11E6:11 Right HVAC Damper Position Sensor: Circuit Short To Ground Module senses a short to ground on the temperature door actuator circuits when motor movement is commanded.
HVAC B11E6:15 Right HVAC Damper Position Sensor: Circuit Short To Battery Or Open Module senses a short to voltage or an open on the temperature door actuator circuits when motor movement is commanded.

Possible Sources

  • Wiring, terminals or connectors
  • Temperature door actuator
  • Temperature door is binding or stuck
  • HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

H1 CHECK THE PASSENGER SIDE TEMPERATURE DOOR ACTUATOR CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect HVAC control module C228A .
  • Disconnect HVAC control module C228B .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228B-14   Ground
      C228B-18   Ground
      C228B-13   Ground

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-2   Ground
      C228A-3   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to H2

H2 CHECK THE PASSENGER SIDE TEMPERATURE DOOR ACTUATOR CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228B-14   Ground
      C228B-18   Ground
      C228B-13   Ground

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-2   Ground
      C228A-3   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to H3
No REPAIR the circuit.

H3 CHECK THE PASSENGER SIDE TEMPERATURE DOOR ACTUATOR CIRCUITS FOR AN OPEN
  • Disconnect Passenger side temperature door actuator C2092 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228B-14   C2092-1
      C228B-18   C2092-4
      C228B-13   C2092-6

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-2   C2092-2
      C228A-3   C2092-3

Are the resistances less than 3 ohms?
Yes GO to H4
No REPAIR the circuit.

H4 CHECK THE PASSENGER SIDE TEMPERATURE DOOR ACTUATOR POWER CIRCUIT FOR VOLTAGE
  • Connect HVAC control module C228A .
  • Ignition ON.
  • On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2092-3   Ground

Is any voltage present?
Yes GO to H5
No GO to Pinpoint Test X

H5 CHECK FOR CORRECT ACTUATOR OPERATION
  • Ignition OFF.
  • Disconnect and inspect the temperature door actuator connector (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminals – clean module pins)
    • damaged or bent pins – install new terminals/pins
    • pushed-out pins – install new pins as necessary
  • Reconnect all disconnected connectors. CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes INSTALL a new passenger side temperature door actuator.
REFER to: Passenger Side Temperature Door Actuator (412-00 Climate Control System - General Information, Removal and Installation).
CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the HVAC control module self-test. TEST the system for normal operation. If the concern is still present, GO to H6
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

H6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST I: THE AIR INLET DOOR IS INOPERATIVE

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Door Actuator – Air Inlet Door, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

During an actuator calibration cycle, the HVAC control module drives the air inlet mode door until the door reaches both internal stops in the HVAC case. If the air inlet mode door is temporarily obstructed or binding during a calibration cycle, the HVAC control module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the air intake may not be from the expected source.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC B1083:07 Recirculation Damper Motor: Mechanical Failures Module senses the air inlet door actuator motor control is awake, no actuator drive, stall before achieving target position within 15 seconds.
HVAC B1083:11 Recirculation Damper Motor: Circuit Short To Ground Module senses a short to ground on air inlet door actuator circuits when motor movement is commanded.
HVAC B1083:12 Recirculation Damper Motor: Circuit Short To Battery Module senses a short to voltage on air inlet door actuator circuits when motor movement is commanded.
HVAC B1083:13 Recirculation Damper Motor: Circuit Open Module senses an open on air inlet door actuator circuits when motor movement is commanded.
HVAC B11F0:11 Air Intake Damper Position Sensor: Circuit Short To Ground Module senses a short to ground on air inlet door actuator circuits when motor movement is commanded.
HVAC B11F0:15 Air Intake Damper Position Sensor: Circuit Short To Battery Or Open Module senses a short to voltage or an open on air inlet door actuator circuits when motor movement is commanded.

Possible Sources

  • Wiring, terminals or connectors
  • Actuator door binding, stuck or slipping
  • Air inlet mode door actuator
  • HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

I1 CHECK THE AIR INLET MODE DOOR ACTUATOR CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect HVAC control module C228A .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-24   Ground
      C228A-2   Ground
      C228A-3   Ground
      C228A-16   Ground
      C228A-25   Ground

Is any voltage present?
Yes REPAIR the affected circuit.
No GO to I2

I2 CHECK THE AIR INLET MODE DOOR ACTUATOR CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-24   Ground
      C228A-2   Ground
      C228A-3   Ground
      C228A-16   Ground
      C228A-25   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to I3
No REPAIR the affected circuit.

I3 CHECK THE AIR INLET MODE DOOR ACTUATOR CIRCUITS FOR AN OPEN
  • Disconnect Air inlet mode door actuator C289 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-24   C289-1
      C228A-2   C289-2
      C228A-3   C289-3
      C228A-16   C289-4
      C228A-25   C289-6

Are the resistances less than 3 ohms?
Yes GO to I4
No REPAIR the circuit.

I4 CHECK THE AIR INLET DOOR ACTUATOR POWER CIRCUIT FOR VOLTAGE
  • Connect HVAC control module C228A .
  • Ignition ON.
  • On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C289-3   Ground

Is any voltage present?
Yes GO to I5
No GO to Pinpoint Test X

I5 CHECK FOR CORRECT ACTUATOR OPERATION
  • Ignition OFF.
  • Disconnect and inspect the air inlet door actuator connector (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminals – clean module pins)
    • damaged or bent pins – install new terminals/pins
    • pushed-out pins – install new pins as necessary
  • Reconnect all disconnected connectors. CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes INSTALL a new air inlet door actuator.
REFER to: Air Inlet Door Actuator (412-00 Climate Control System - General Information, Removal and Installation).
CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the HVAC control module self-test. TEST the system for normal operation. If the concern is still present, GO to I6
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

I6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST J: INCORRECT OR ERRATIC DIRECTION OF AIRFLOW FROM OUTLETS

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Air Handling, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

During an actuator calibration cycle, the HVAC control module drives the defrost vent door and the footwell vent/register door until the doors reach both internal stops in the HVAC case. If the defrost vent door or the footwell vent/register door is temporarily obstructed or binding during a calibration cycle, the HVAC control module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be from the expected outlets.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC B1086:07 Air Distribution Damper Motor: Mechanical Failures Module senses the air distribution door actuator motor control is awake, no actuator drive, stall before achieving target position within 15 seconds.
HVAC B1086:11 Air Distribution Damper Motor: Circuit Short To Ground Module senses a short to ground on air distribution door actuator circuits when motor movement is commanded.
HVAC B1086:12 Air Distribution Damper Motor: Circuit Short To Battery Module senses a short to voltage on air distribution door actuator circuits when motor movement is commanded.
HVAC B1086:13 Air Distribution Damper Motor: Circuit Open Module senses an open on air distribution door actuator circuits when motor movement is commanded.
HVAC B11E7:11 Air Distribution Damper Position Sensor: Circuit Short To Ground Module senses a short to ground on air distribution door actuator circuits when motor movement is commanded.
HVAC B11E7:15 Air Distribution Damper Position Sensor: Circuit Short To Battery Or Open Module senses a short to voltage or an open on air distribution door actuator circuits when motor movement is commanded.

Possible Sources

  • Wiring, terminals or connectors
  • Actuator doors binding, stuck or slipping
  • Air distribution door actuator
  • HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

J1 CHECK THE AIR DISTRIBUTION DOOR ACTUATOR CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect HVAC control module C228A .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-20   Ground
      C228A-2   Ground
      C228A-3   Ground
      C228A-22   Ground
      C228A-21   Ground

Is any voltage present?
Yes REPAIR the circuit in question.
No GO to J2

J2 CHECK THE AIR DISTRIBUTION DOOR ACTUATOR CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-20   Ground
      C228A-2   Ground
      C228A-3   Ground
      C228A-22   Ground
      C228A-21   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to J3
No REPAIR the circuit in question.

J3 CHECK THE AIR DISTRIBUTION DOOR ACTUATOR CIRCUITS FOR AN OPEN
  • Disconnect Air distribution door actuator C236 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-20   C236-1
      C228A-2   C236-2
      C228A-3   C236-3
      C228A-22   C236-4
      C228A-21   C236-6

Are the resistances less than 3 ohms?
Yes GO to J4
No REPAIR the circuit in question.

J4 CHECK THE AIR DISTRIBUTION DOOR ACTUATOR POWER CIRCUIT FOR VOLTAGE
  • Connect HVAC control module C228A-- .
  • Ignition ON.
  • On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C236-3   Ground

Is any voltage present?
Yes GO to J5
No GO to Pinpoint Test X

J5 CHECK FOR CORRECT ACTUATOR OPERATION
  • Ignition OFF.
  • Disconnect and inspect the air distribution door actuator connector (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminals – clean module pins)
    • damaged or bent pins – install new terminals/pins
    • pushed-out pins – install new pins as necessary
  • Reconnect all disconnected connectors. CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes INSTALL a new air distribution door actuator.
REFER to: Air Distribution Door Actuator (412-00 Climate Control System - General Information, Removal and Installation).
CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the HVAC control module self-test. TEST the system for normal operation. If the concern is still present, GO to J6
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

J6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST K: INSUFFICIENT, ERRATIC OR NO HEAT WITH NO DIAGNOSTIC TROUBLE CODE (DTCS) - EXCEPT PLUG-IN ELECTRIC HYBRID VEHICLES

Normal Operation and Fault Conditions

When the engine is at operating temperature hot coolant primarily flows from the engine through the heater core and back to the engine. Correct coolant temperatures are critical for good heater performance. A restriction of coolant flow due to a transmission fluid heater coolant control valve (if equipped), or a cabin heater coolant pump (if equipped), may cause poor coolant flow to the heater core.

Possible Sources

  • Low engine coolant level
  • Heater core
  • Temperature door binding or stuck
  • Temperature door actuator

Visual Inspection and Pre-checks

  • Inspect for low engine coolant level.
K1 CHECK FOR CORRECT ENGINE COOLANT LEVEL
  • Ignition OFF.
  • Check the engine coolant level.

Is the engine coolant at the correct level (hot or cold) as indicated on the engine coolant recovery reservoir?
Yes GO to K3
No GO to K2

K2 CHECK THE ENGINE COOLING SYSTEM FOR LEAKS
  • Pressure test the cooling system for leaks. Refer to the appropriate section in Group 303 for the procedure.

Does the cooling system leak?
Yes REPAIR the coolant leak.
No FILL and BLEED the cooling system. Refer to the appropriate section in Group 303 for the procedure.
After filling and bleeding the cooling system, GO to K3

K3 CHECK FOR COOLANT FLOW TO THE HEATER CORE
  • Run the engine until it reaches normal operating temperature.
  • On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.
  • Using a suitable temperature measuring device, check the temperature of the heater core inlet hose.

Is the heater core inlet hose temperature above 65.5°C (150°F)?
Yes GO to K4
No DIAGNOSE the engine does not reach operating temperature. Refer to the appropriate section in Group 303 for the procedure.

K4 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE
  • Using a suitable temperature measuring device, measure the temperature of the heater core outlet hose.

Is the heater core outlet hose temperature similar to the inlet hose temperature [within approximately 6-17°C (10-30°F)]?
Yes DIAGNOSE an inoperative temperature door actuator, GO to Pinpoint Test G or GO to Pinpoint Test H
No GO to K5

K5 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE RETURN LOOP
  • INSTALL a temporary bypass hose from the heater core outlet to the thermostat housing assembly (as applicable).
  • Using a suitable temperature measuring device, measure the heater core inlet and outlet hose temperatures.

Is the heater core outlet hose temperature similar to the inlet hose temperature [within approximately 6-17°C (10-30°F)]?
Yes There is a restriction in the coolant control valve and/or the hoses.
If equipped with a cabin heater coolant pump, DIAGNOSE for the cabin coolant pump causing a possible restriction of flow to the heater core. Using a suitable temperature measuring device, check the temperature of the coolant hose to the applicable component.
REPAIR or replace components as necessary.
No INSTALL a new heater core.
REFER to: Heater Core (412-00 Climate Control System - General Information, Removal and Installation).
TEST the system for normal operation.

PINPOINT TEST L: THE A/C (AIR CONDITIONING) IS INOPERATIVE - NO DIAGNOSTIC TROUBLE CODES (DTCS) - NON HEV (HYBRID ELECTRIC VEHICLE)

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

When an A/C request is received by the PCM , the A/C clutch is engaged when all of the following conditions are met:

  • Excessively high or low refrigerant pressure from the A/C pressure transducer is not detected.
  • Ambient air temperature is above approximately 0°C (32.0°F).
  • Evaporator temperature is above approximately 1°C (33.8°F).
  • Engine coolant temperature conditions are within normal parameters.
  • Wide Open Throttle (WOT) condition is not present.
  • Engine torque conditions are within normal parameters.
  • Battery state of charge conditions are within normal parameters.

For more information on A/C Request, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

Possible Sources

  • Wiring, terminals or connectors
  • A/C system discharged or low refrigerant charge
  • Network concerns
  • A/C pressure transducer
  • Evaporator temperature sensor
  • Engine temperature sensors
  • A/C compressor clutch air gap
  • A/C compressor clutch field coil
  • A/C clutch relay [non-serviceable, part of the BJB ]
  • HVAC control module

Visual Inspection and Pre-checks

  • Inspect BJB fuse 12 (10A)
  • Verify the A/C compressor belt is OK.
  • Verify the A/C compressor clutch is engaged/operating.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Some Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs) may inhibit Air Conditioning (A/C) operation. If any Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs) are retrieved, diagnose those first. Refer to the Diagnostic Trouble Code (DTC) Chart.

L1 VERIFY THE AIR CONDITIONING (A/C) CLUTCH OPERATION
  • Start the engine. Observe the outside temperature display for proper operation.
  • On the HVAC controls, set the temperature to full cold, select PANEL and select the A/C button (indicator on).

Does the A/C compressor clutch engage?
Yes TEST the A/C system for normal operation. Carry out the Refrigerant System Tests.
REFER to: Refrigerant System Tests - 1.5L EcoBoost (132kW/180PS) – I3 (Y1) (412-00 Climate Control System - General Information, General Procedures).
REFER to: Refrigerant System Tests - 2.0L EcoBoost (177kW/240PS) – MI4 (412-00 Climate Control System - General Information, General Procedures).
No GO to L2

L2 RESET THE AMBIENT AIR TEMPERATURE (AAT) SENSOR
  • Ignition OFF.
  • Wait 1 minute.
  • Ignition ON.
  • Using the FDRS diagnostic scan tool, follow the on screen prompts to reset the Outside Air Temperature (OAT)/Ambient Air Temperature (AAT) sensor data.
    REFER to: Reset the Outside Air Temperature Sensor Learned Values (412-00 Climate Control System - General Information, General Procedures).
  • Start the engine.
  • On the HVAC controls, set the temperature to full cold, select PANEL and select the A/C button (indicator on).

Does the A/C compressor turn on?
Yes TEST the A/C system for normal operation. CARRY OUT the refrigerant system tests.
REFER to: Refrigerant System Tests - 1.5L EcoBoost (132kW/180PS) – I3 (Y1) (412-00 Climate Control System - General Information, General Procedures).
REFER to: Refrigerant System Tests - 2.0L EcoBoost (177kW/240PS) – MI4 (412-00 Climate Control System - General Information, General Procedures).
No GO to L3

L3 CHECK THE A/C (AIR CONDITIONING) SYSTEM PRESSURE

NOTE: Static refrigerant pressure, under perfect conditions, should approximately reflect ambient air temperature. Do not rely upon the static refrigerant pressure alone to determine if the system is properly charged. Refer to the current Ford Web Based Technical Training courses for basic HVAC system refrigerant operation.

  • Ignition OFF.
  • Connect a manifold gauge set.
  • With a manifold gauge set connected, check for minimum A/C system pressure.

Is the A/C system pressure above 290 kPa (42 psi)?
Yes GO to L4
No CHECK the A/C system for leaks. GO to Pinpoint Test AU
After leak is repaired, RECHARGE the A/C system.
REFER to: Air Conditioning (A/C) System Recovery, Evacuation and Charging (412-00 Climate Control System - General Information, General Procedures).

L4 CHECK THE COMMUNICATION NETWORK
  • Ignition ON.
  • Using a diagnostic scan tool, carry out the network test.

Do the HVAC control module and the PCM pass the network test?
Yes GO to L5
No DIAGNOSE the HVAC control module or PCM does not communicate with the diagnostic scan tool.
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).

L5 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) PRESSURE SENSOR (ACP_PRESS) PARAMETER IDENTIFICATION (PID)

NOTE: The following pinpoint test step is tested in ambient temperature of approximately 21.1°C (70°F). As ambient temperatures near 38°C (100.4°F), the pressure value difference increases above ± 15 psi (103 kPa) range.

  • With a manifold gauge set connected, compare the pressure readings of the manifold gauge set and the

    Access the  PCM  and monitor the  ACP_PRESS (kPa)  PID


Are the pressure values of the manifold gauge set and the ACP_PRESS PCM PID , dependent upon ambient temperatures, within ± 103 kPa (15 psi)?
Yes GO to L6
No DIAGNOSE the A/C pressure transducer. GO to Pinpoint Test A

L6 COMPARE THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE EVAPORATOR TEMPERATURE (EVAP_TEMP) PARAMETER IDENTIFICATION (PID) TO THE PCM (POWERTRAIN CONTROL MODULE) AMBIENT AIR TEMPERATURE (AAT) PARAMETER IDENTIFICATION (PID)
  • Ignition OFF.
  • Allow the vehicle exterior and interior to stabilize to ambient temperature. This can take a soak period of at least 6 hours.
  • Ignition ON.
  • Using a diagnostic scan tool, monitor and record the

    Access the  PCM  and monitor the  AAT (Deg C)  PID

  • Using a diagnostic scan tool, monitor and record the

    Access the  HVAC  and monitor the  EVAP_TEMP (Deg C)  PID


Are the temperature values similar [typically within 18ºC or 30ºF of each other]?
Yes GO to L7
No DIAGNOSE the evaporator temperature sensor. GO to Pinpoint Test F

L7 COMPARE THE PCM (POWERTRAIN CONTROL MODULE) INTAKE AIR TEMPERATURE (IAT) PARAMETER IDENTIFICATION (PID) AND THE OTHER TEMPERATURE SENSOR READINGS TO THE PCM (POWERTRAIN CONTROL MODULE) AMBIENT AIR TEMPERATURE (AAT) PARAMETER IDENTIFICATION (PID)

NOTE: Compare multiple engine sensor readings to the ambient temperature to determine sensors are reading correctly. A faulty sensor can cause the Powertrain Control Module (PCM) to disable the Air Conditioning (A/C) with or without a Diagnostic Trouble Code (DTC).

  • Monitor the temperature Parameter Identifications (PIDs) (as applicable):
    • Access the  PCM  and monitor the  AAT (Deg C)  PID

    • Access the  PCM  and monitor the  CAC_T (Deg C)  PID

    • Access the  PCM  and monitor the  CHT (Deg C)  PID

    • Access the  PCM  and monitor the  ECT (Deg C)  PID

    • Access the  PCM  and monitor the  IAT (Deg C)  PID

    • Access the  PCM  and monitor the  IAT2 (Deg C)  PID


Are the temperature values similar [typically within 18ºC or 30ºF of each other]?
Yes GO to L8
No DIAGNOSE the suspect PCM temperature sensor. REFER to the appropriate Workshop Manual (WSM) section in Group 303.

L8 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE A/C (AIR CONDITIONING) SWITCH (CC_SW_AC) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) ON
  • Access the  HVAC  and monitor the  CC_SW_AC  PID

  • On the HVAC controls, select PANEL and then press the A/C button (indicator ON).

Does the PID display ON or Yes when the button is pressed?
Yes GO to L9
No GO to L16

L9 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) REQUEST SIGNAL (AC_REQ) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) ON
  • Start the engine.
  • Access the  PCM  and monitor the  AC_REQ  PID

  • On the HVAC controls, select PANEL and then press the A/C button (indicator ON).

Does the PID display ON or Yes when the button is pressed?
Yes GO to L10
No GO to L16

L10 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) COMPRESSOR COMMANDED STATE (ACC_CMD) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) COMMANDED ON
  • Access the  PCM  and control the  ACC_CMD  PID


Does the A/C compressor turn on?
Yes GO to L17
No GO to L11

L11 CHECK THE A/C (AIR CONDITIONING) CLUTCH RELAY COIL CONTROL CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect PCM C175B (1.5L) C1551B (2.0L).
  • Disconnect BJB C1035A .
  • For vehicles equipped with a 1.5L engine, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1035A-3   C175B-62
  • For vehicles equipped with a 2.0L engine, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1035A-3   C1551B-62

Is the resistance less than 3 ohms?
Yes GO to L12
No REPAIR the circuit.

L12 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH FIELD COIL VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
  • Disconnect A/C clutch field coil C100A .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1035A-11   C100A-1

Is the resistance less than 3 ohms?
Yes GO to L13
No REPAIR the circuit.

L13 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH FIELD COIL GROUND CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C100A-2   Ground

Is the resistance less than 3 ohms?
Yes GO to L14
No REPAIR the circuit.

L14 CHECK THE AIR CONDITIONING CLUTCH RELAY OPERATION
  • Disconnect BJB fuse 12 (10A).
  • Connect PCM C175B (1.5L) C1551B (2.0L).
  • Connect BJB C1035A .
  • Ignition ON.
  • Access the  PCM  and control the  ACC_CMD  PID

  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    BJB fuse 12 (10A) socket (component side)   Ground

Is the voltage greater than 11 volts?
Yes GO to L15
No INSTALL a new BJB .

L15 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH AIR GAP
  • Measure the A/C compressor clutch air gap at 3 equally spaced locations between the clutch hub and the A/C compressor clutch pulley.
    REFER to: Air Conditioning (A/C) Clutch Air Gap Adjustment (412-00 Climate Control System - General Information, General Procedures).

Is the A/C compressor clutch air gap greater than 0.6 mm (0.0236 in)?
Yes ADJUST the A/C compressor clutch air gap.
REFER to: Air Conditioning (A/C) Clutch Air Gap Adjustment (412-00 Climate Control System - General Information, General Procedures).
No INSTALL a new A/C compressor clutch and field coil.
REFER to: Air Conditioning (A/C) Clutch and Air Conditioning (A/C) Clutch Field Coil (412-00 Climate Control System - General Information, General Procedures).

L16 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

L17 CHECK FOR AN INPUT DISABLING THE A/C (AIR CONDITIONING) CLUTCH RELAY

NOTE: The Powertrain Control Module (PCM) strategy may disable the Air Conditioning (A/C) compressor operation. If the A/C compressor clutch can be commanded on using a diagnostic scan tool Powertrain Control Module (PCM) Parameter Identifications (PIDs) Active Commands, Powertrain Control Module (PCM) replacement will not resolve the condition.

  • Diagnose the PCM not energizing the A/C clutch relay using the suggestions in the table below.
    A/C Clutch Engagement is inhibited because strategy has not yet detected hardware that indicates vehicle is equipped with A/C
    A/C Clutch Engagement is inhibited because the strategy is operating in Ignition System Failure Mode
    A/C Clutch Engagement is inhibited because the (ECU) received a Request to Command the A/C Off
    A/C Clutch Engagement is inhibited because the engine has not yet reached a stable running mode after starting
    A/C Clutch Engagement is inhibited because the A/C Discharge (Head) Pressure is Too High
    A/C Clutch Engagement is inhibited because the Engine Coolant Temperature is Too High
    A/C Clutch Engagement is inhibited to Prevent Frost and Ice Build Up on the Evaporator
    A/C Clutch Engagement is inhibited to Prevent an Engine Stall during a Low Engine Speed condition
    A/C Clutch Engagement is inhibited to Protect the Compressor from a Compressor Over-speed condition
    A/C Clutch Engagement is inhibited to temporarily make more power available when Accelerator Pedal is Fully Depressed
    A/C Clutch Engagement is inhibited because Low A/C Refrigerant Charge has been detected
    A/C Clutch Engagement is inhibited to Protect the Compressor from Operating at Too Low of an Ambient Temperature
    A/C Clutch Engagement is inhibited due to Missing Climate Control Message
    A/C Clutch Engagement is inhibited because the strategy is operating in Failsafe Cooling Mode
    A/C Clutch Engagement is inhibited to Protect the Clutch from Damage because the Compressor Load and Speed are Too High
    A/C Clutch Engagement is inhibited by the off portion of the A/C Cycling Strategy invoked to manage High Engine Temperature
    A/C Clutch Engagement is inhibited due to Low Battery State of Charge
    A/C Clutch Engagement is inhibited to Protect the Variable Displacement Compressor from Operating at Too Low of a Temperature
    A/C Clutch Engagement is inhibited to improve Brake Booster Vacuum
    A/C Clutch Engagement is inhibited because Evaporator Temperature is sufficiently low and compressor was at minimum displacement
    A/C Clutch Engagement is inhibited (Disabled) because the Evaporator Temperature is sufficiently below the target temperature
    A/C Clutch Engagement is inhibited to satisfy A/C Clutch minimum off time
    A/C Clutch Engagement is inhibited Due to Request from Torque Control Strategy (to Temporarily Make More Power Available)
    A/C Clutch Engagement is inhibited to Prevent Engine Stalling
    A/C Clutch Engagement is inhibited Due to Request to Disable A/C from Stop-Start Strategy
    A/C Clutch Engagement is inhibited (Delayed) to make Power Available for Power Steering
    A/C Clutch Engagement Is Inhibited Due To State Of Auxiliary A/C Disable (Typically A Pressure Or Temperature) Switch 1 input
    A/C Clutch Engagement is inhibited due to state of auxiliary A/C Disable (Typically a Pressure or Temperature) Switch 2 input

Are any of the conditions described above not within normal parameters?
Yes DIAGNOSE the condition found to be disabling the A/C clutch relay. REFER to the appropriate Workshop Manual (WSM) section in Group 303.
No The A/C compressor clutch can be commanded on using the diagnostic scan tool PCM active command PID . The A/C inoperative concern may be caused by an intermittent condition due to a component or module connection, wiring or pin issue. ADDRESS the root cause of any connector or pin issues. CHECK the vehicle service history for recent service actions that have replaced modules. This condition may be due to incomplete or incorrect PMI procedures.

PINPOINT TEST M: THE A/C (AIR CONDITIONING) IS ALWAYS ON — A/C (AIR CONDITIONING) MODE ALWAYS COMMANDED ON - NON HEV (HYBRID ELECTRIC VEHICLE)

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

A/C Request, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P1464:00 A/C Demand Out Of Self Test Range: No Sub Type Information PCM senses an A/C request during a self-test.

Possible Sources

  • Wiring, terminals or connectors
  • A/C pressure transducer
  • Evaporator temperature sensor
  • HVAC control module
  • PCM
M1 RECHECK THE PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Make sure the HVAC control module is powered off.
  • Using a diagnostic scan tool, clear the PCM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, carry out the PCM self-test.

Does DTC P1464 return?
Yes GO to M2
No IGNORE the DTC and CONTINUE diagnosing other Diagnostic Trouble Codes (DTCs) or symptoms. GO to the PCM DTC Chart or Symptom Chart – Climate Control in this section.

M2 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH FIELD COIL VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect A/C clutch field coil C100A .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C100A-1   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to M3

M3 COMPARE THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE EVAPORATOR TEMPERATURE (EVAP_TEMP) PID (PARAMETER IDENTIFICATION) TO THE PCM (POWERTRAIN CONTROL MODULE) AMBIENT AIR TEMPERATURE (AAT) PID (PARAMETER IDENTIFICATION)
  • Ignition OFF.
  • Allow the vehicle exterior and interior to stabilize to ambient temperature. This can take a soak period of at least 6 hours.
  • Ignition ON.
  • Monitor and record the

    Access the  PCM  and monitor the  AAT (Deg C)  PID

  • Monitor and record the

    Access the  HVAC  and monitor the  EVAP_TEMP (Deg C)  PID


Are the temperature values similar (typically within 18ºC (32.4ºF))?
Yes GO to M4
No DIAGNOSE the evaporator temperature sensor. GO to Pinpoint Test F

M4 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR (ACP_PRESS) PARAMETER IDENTIFICATION (PID)

NOTE: The following pinpoint test step is tested in ambient temperature of approximately 21.1°C (70°F). As ambient temperatures near 38°C (100.4°F), the pressure value difference increases above ± 15 psi (103 kPa) range.

  • Ignition ON.
  • With a manifold gauge set connected, compare the pressure readings of the manifold gauge set and the

    Access the  PCM  and monitor the  ACP_PRESS (kPa)  PID


Are the pressure values of the manifold gauge set and the ACP_PRESS PCM PID , dependent upon ambient temperature, within ± 103 kPa (15 psi)?
Yes GO to M5
No DIAGNOSE the A/C pressure transducer. GO to Pinpoint Test A

M5 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE A/C (AIR CONDITIONING) SWITCH STATUS (CC_SW_AC) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) OFF
  • Ignition ON.
  • Access the  HVAC  and monitor the  CC_SW_AC  PID

  • Using the HVAC controls, select PANEL then press and release the A/C button (indicator off).

Does the PID display On when the A/C button is pressed and Off when released?
Yes GO to M6
No GO to M8

M6 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) REQUEST SIGNAL (AC_REQ) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) OFF
  • Access the  PCM  and monitor the  AC_REQ  PID

  • Using the HVAC controls, deactivate the A/C .

Does the PID display OFF?
Yes GO to M8
No GO to M7

M7 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) REQUEST SIGNAL (AC_REQ) PID (PARAMETER IDENTIFICATION) WITH THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE DISCONNECTED
  • Ignition OFF.
  • Disconnect HVAC control module C228A .
  • Ignition ON.
  • Access the  PCM  and monitor the  AC_REQ  PID


Does the PID display OFF?
Yes GO to M8
No GO to M9

M8 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

M9 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all PCM electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all PCM electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,
   VIN required to access Guided Routine (PCM)
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST N: THE BLOWER MOTOR IS INOPERATIVE

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Air Handling, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC B10AF:11 Blower Fan Relay: Circuit Short To Ground Module senses low voltage on the relay coil voltage circuit when the module is energizing the circuit. Blower relay is permanently inactive.
HVAC B10AF:13 Blower Fan Relay: Circuit Open Module senses no change in voltage on the blower relay coil voltage circuit when the module is energizing the circuit. The blower motor relay is inactive when circuit is open.
HVAC B10AF:15 Blower Fan Relay: Circuit Short To Battery Or Open Module senses high voltage when fan is in the off position or no change in voltage on the blower relay coil voltage circuit when the module is energizing the circuit. The blower motor relay is always active when shorted to battery, inactive when circuit is open.
HVAC B10B9:12 Blower Control: Circuit Short To Battery Module senses high voltage on the blower motor control PWM circuit, indicating a short directly to voltage. The blower motor is inoperative.
HVAC B10B9:14 Blower Control: Circuit Short To Ground Or Open Module senses no voltage on the blower motor control PWM circuit, indicating a short directly to ground or an open circuit. The blower motor runs at full speed if the circuit is shorted to ground. The blower motor is inoperative if the circuit is open

Possible Sources

  • Fuse
  • Wiring, terminals or connectors
  • Blower motor relay (non-serviceable, part of the BJB )
  • Blower motor control module
  • HVAC control module

Visual Inspection and Pre-checks

  • Make sure BJB fuse 13 (40A) is OK.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

N1 CHECK THE BLOWER MOTOR RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Disconnect BJB C1035B .
  • Disconnect HVAC control module C228A .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-11   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to N2
No REPAIR the circuit.

N2 CHECK THE BLOWER MOTOR RELAY COIL CONTROL CIRCUIT FOR AN OPEN

NOTE: Some vehicles may be equipped with a diode in the blower motor relay coil ground circuit. Make sure the multimeter leads are correctly attached during testing or a false reading will occur causing misdiagnosis of the circuit. For additional information, refer to the Wiring Diagrams manual.

  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-11   C1035B-16

Is the resistance less than 3 ohms?
Yes GO to N3
No REPAIR the circuit.

N3 CHECK THE BLOWER MOTOR CONTROL MODULE VOLTAGE CIRCUIT FOR AN OPEN
  • Disconnect Blower motor control module C297 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C297-1   C1035B-26

Is the resistance less than 3 ohms?
Yes GO to N4
No REPAIR the circuit.

N4 CHECK FOR VOLTAGE TO THE BLOWER MOTOR CONTROL MODULE
  • Connect BJB C1035B .
  • Connect HVAC control module C228A .
  • Ignition ON.
  • Select PANEL on the HVAC controls.
  • Select the highest blower motor setting.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C297-1   Ground

Is the voltage greater than 11 volts?
Yes GO to N5
No VERIFY BJB fuse 13 (40A) is OK.
If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.
If OK, INSTALL a new BJB .

N5 CHECK THE BLOWER MOTOR CONTROL MODULE GROUND CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C297-6   Ground

Is the resistance less than 3 ohms?
Yes GO to N6
No REPAIR the circuit.

N6 CHECK THE BLOWER MOTOR CONTROL MODULE PWM (PULSE WIDTH MODULATION) CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect HVAC control module C228A .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C297-2   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to N7

N7 CHECK THE BLOWER MOTOR CONTROL MODULE PWM (PULSE WIDTH MODULATION) CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C297-2   C228A-23

Is the resistance less than 3 ohms?
Yes GO to N8
No REPAIR the circuit.

N8 CHECK FOR CORRECT BLOWER MOTOR CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect the blower motor speed control connector.
  • Repair:
    • corrosion (install new connector or terminals – clean module pins)
    • damaged or bent pins – install new terminals/pins
    • pushed-out pins – install new pins as necessary
  • Reconnect the blower motor speed control connector. Make sure it seats and latches correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes INSTALL a new blower motor control module.
REFER to: Blower Motor Control Module (412-00 Climate Control System - General Information, Removal and Installation).
CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the HVAC control module self-test. TEST the system for normal operation. If the concern is still present, GO to N9
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

N9 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST O: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Air Handling, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC B10AF:15 Blower Fan Relay: Circuit Short To Battery Or Open Module senses high voltage when fan is in the off position or no change in voltage on the blower relay coil voltage circuit when the module is energizing the circuit. The blower motor relay is always active when shorted to battery, inactive when circuit is open.
HVAC B10AF:12 Blower Fan Relay: Circuit Short To Battery Module senses high voltage on the relay coil voltage circuit when the module is energizing the circuit. Blower relay is permanently active.
HVAC B10B9:14 Blower Control: Circuit Short To Ground Or Open Module senses no voltage on the blower motor control PWM circuit, indicating a short directly to ground or an open circuit. The blower motor runs at full speed if the circuit is shorted to ground. The blower motor is inoperative if the circuit is open

Possible Sources

  • Wiring, terminals or connectors
  • Blower motor control module
  • HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

O1 VERIFY THE BLOWER MOTOR OPERATION
  • Ignition ON.
  • Select PANEL on the HVAC controls. Adjust the blower motor setting to the minimum and maximum settings.

Does the blower motor operate at any setting?
Yes GO to O2
No GO to Pinpoint Test N

O2 CHECK THE BLOWER MOTOR CONTROL MODULE PWM (PULSE WIDTH MODULATION) CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Disconnect Blower motor control module C297 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C297-2   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to O3
No REPAIR the circuit.

O3 CHECK THE BLOWER MOTOR RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
  • Disconnect HVAC control module C228A .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-11   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to O4

O4 CHECK THE BLOWER MOTOR CONTROL MODULE VOLTAGE CIRCUIT FOR A SHORT TO VOLTAGE
  • Disconnect BJB fuse 13 (40A).
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C297-1   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to O5

O5 CHECK FOR CORRECT BLOWER MOTOR CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect the blower motor speed control connector.
  • Repair:
    • corrosion (install new connector or terminals – clean module pins)
    • damaged or bent pins – install new terminals/pins
    • pushed-out pins – install new pins as necessary
  • Reconnect the blower motor speed control connector. Make sure it seats and latches correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes INSTALL a new blower motor control module.
REFER to: Blower Motor Control Module (412-00 Climate Control System - General Information, Removal and Installation).
CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the HVAC control module self-test. TEST the system for normal operation. If the concern is still present, GO to O6
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

O6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST P: U0140:00

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The ACCM and the HVAC control module communicate with the BCM over the CAN . If messages are missing or not received from the BCM , the climate control system may not operate not operate correctly. REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

Inspect for loose or corroded BCM and HVAC control module connections.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
ACCM U0140:00 Lost Communication With Body Control Module: No Sub Type Information Sets in continuous memory when the ACCM detects network messages are missing from the BCM for more than 5 seconds.
HVAC U0140:00 Lost Communication With Body Control Module: No Sub Type Information Sets in continuous memory when the HVAC control module detects network messages are missing from the BCM for more than 5 seconds.

Possible Sources

  • Network communication concern
  • Wiring, terminals or connectors
  • Over or under voltage concerns
  • ACCM
  • HVAC control module
  • BCM
P1 VERIFY THE CONCERN
  • Ignition ON.
  • Verify there is an observable symptom present.

Is an observable symptom present?
Yes GO to P2
No CLEAR the DTC . The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

P2 CHECK THE NETWORK COMMUNICATION
  • Using a diagnostic scan tool, carry out the network test.

Does the BCM pass the network test?
Yes GO to P3
No
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).

P3 CHECK FOR NON-NETWORK DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using a diagnostic scan tool, carry out the self-test for the module in question (ACCM , HVAC control module) setting the DTC .

Are any non-network Diagnostic Trouble Codes (DTCs) present?
Yes DIAGNOSE all non-network Diagnostic Trouble Codes (DTCs) first. REFER to the appropriate DTC Chart in this section.
No GO to P4

P4 CHECK FOR NON-NETWORK BCM (BODY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using a diagnostic scan tool, carry out the BCM self-test.

Are any non-network Diagnostic Trouble Codes (DTCs) present?
Yes
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Diagnosis and Testing).
No GO to P5

P5 RECHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0140:00
  • Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs) for the module in question (ACCM , HVAC control module setting the DTC .
  • Ignition OFF.
  • Ignition ON.
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the self-test for the module in question (ACCM , HVAC control module setting the DTC .

Is DTC U0140:00 still present?
Yes GO to P6
No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

P6 CHECK FOR OTHER CAUSES OF NETWORK COMMUNICATION CONCERN

NOTE: If new modules were installed prior to the Diagnostic Trouble Code (DTC) being set, the module configuration can be incorrectly set during the Programmable Module Installation (PMI) or the Programmable Module Installation (PMI) may not have been carried out.

  • Check the vehicle service history for recent service actions related to the BCM and the module in question ( ACCM , HVAC control module) setting the DTC . If recent service history is found:
    • verify correct replacement module was installed
      • vehicle parts build list may be used to verify correct part fitment
    • verify the configuration of replacement module was correct
      • re-configure module using as-built data if prior configuration is suspect
    • verify the module was not obtained from a like vehicle and installed into vehicle with concern
      • return the swapped module to source vehicle and obtain new replacement module
  • Operate the system and determine if the observable symptom is still present.

Is the observable symptom still present?
Yes GO to P7
No The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

P7 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all BCM electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all BCM electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCM .
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST Q: U0151:00

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC U0151:00 Lost Communication With Restraints Control Module: No Sub Type Information This DTC sets in the HVAC control module if data messages received from the RCM are missing.

Possible Sources

  • Vehicle communication bus
  • RCM
  • HVAC control module
Q1 VERIFY THE CUSTOMER CONCERN
  • Ignition ON.
  • Verify there is an observable symptom present.

Is an observable symptom present?
Yes GO to Q2
No CLEAR the DTC . The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

Q2 CHECK THE COMMUNICATION NETWORK
  • Using a diagnostic scan tool, carry out the network test.

Does the RCM pass the network test?
Yes GO to Q3
No DIAGNOSE the RCM does not communicate with the diagnostic scan tool,
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).

Q3 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE RCM (RESTRAINTS CONTROL MODULE) SELF-TEST
  • Using a diagnostic scan tool, carry out the RCM self-test.

Are any Diagnostic Trouble Codes (DTCs) recorded?
Yes
REFER to: Airbag Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System, Diagnosis and Testing).
No GO to Q4

Q4 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE (HVAC) HEATING, VENTILATION AND AIR CONDITIONING CONTROL MODULE SELF-TEST
  • Using a diagnostic scan tool, carry out the HVAC control module self-test.

Is DTC U3003:16 or DTC U3003:17 recorded?
Yes For U3003:16 GO to Pinpoint Test AD
For U3003:17 GO to Pinpoint Test AE
No GO to Q5

Q5 RECHECK THE (HVAC) HEATING, VENTILATION AND AIR CONDITIONING CONTROL MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

NOTE: If new modules were installed prior to the Diagnostic Trouble Code (DTC) being set, the module configuration can be incorrectly set during the Programmable Module Installation (PMI) or the Programmable Module Installation (PMI) may not have been carried out.

  • Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Ignition ON.
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the HVAC control module self-test.

Is DTC U0151:00 still present?
Yes GO to Q6
No CLEAR the DTC . The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

Q6 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0151:00 SET IN OTHER MODULES
  • Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Ignition ON.
  • Wait 10 seconds.
  • Using a diagnostic scan tool, retrieve all continuous memory Diagnostic Trouble Codes (DTCs).

Is DTC U0151:00 set in other modules on the network?
Yes GO to Q7
No GO to Q8

Q7 CHECK FOR CORRECT RCM (RESTRAINTS CONTROL MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the RCM electrical connector (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect RCM electrical connector. Make sure it seats and latches correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new RCM .
REFER to: Restraints Control Module (RCM) (501-20B Supplemental Restraint System, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

Q8 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly. WAIT 20 seconds for the range calibration to be executed after reconnecting of the module before any further assessment or measurement is made. If the actuator range calibration does not start, or has been interrupted, carry out the HVAC Calibration Routine, using a diagnostic scan tool.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST R: U0155:00

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

With the ignition ON, the IPC sends messages to the HVAC control module over the MS-CAN . If the HVAC control module does not receive these messages within the specified time frame, the module sets a DTC . This can be due to an IPC failure, a circuit failure on the MS-CAN or an excessive load on the network. For information on the messages sent to the HVAC control module by the IPC , REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC U0155:00 Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information If data messages received from the IPC over the MS-CAN are missing for 5 seconds or more.

Possible Sources

  • Network communication concern
  • Wiring, terminals or connectors
  • Over or undervoltage concerns
  • IPC
  • HVAC control module
R1 VERIFY THE CUSTOMER CONCERN
  • Ignition ON.
  • Verify there is an observable symptom present.

Is an observable symptom present?
Yes GO to R2
No CLEAR the DTC . The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

R2 CHECK THE COMMUNICATION NETWORK
  • Using a diagnostic scan tool, carry out the network test.

Does the IPC pass the network test?
Yes GO to R3
No DIAGNOSE the IPC does not communicate with the diagnostic scan tool,
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).

R3 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
  • Using a diagnostic scan tool, carry out the IPC self-test.

Are any Diagnostic Trouble Codes (DTCs) recorded?
Yes
REFER to: Instrumentation, Message Center and Warning Chimes (413-01 Instrumentation, Message Center and Warning Chimes, Diagnosis and Testing).
REFER to: Instrumentation, Message Center and Warning Chimes - Vehicles With: Head Up Display (HUD) (413-01 Instrumentation, Message Center and Warning Chimes, Diagnosis and Testing).
No GO to R4

R4 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE (HVAC) HEATING, VENTILATION AND AIR CONDITIONING CONTROL MODULE SELF-TEST
  • Using a diagnostic scan tool, carry out the HVAC control module self-test.

Is DTC U3003:16 or DTC U3003:17 recorded?
Yes For U3003:16 GO to Pinpoint Test AD
For U3003:17 GO to Pinpoint Test AE
No GO to R5

R5 RECHECK THE (HVAC) HEATING, VENTILATION AND AIR CONDITIONING CONTROL MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

NOTE: If new modules were installed prior to the Diagnostic Trouble Code (DTC) being set, the module configuration can be incorrectly set during the Programmable Module Installation (PMI) or the Programmable Module Installation (PMI) may not have been carried out.

  • Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Ignition ON.
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the HVAC control module self-test.

Is DTC U0155:00 still present?
Yes GO to R6
No CLEAR the DTC . The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

R6 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0155:00 SET IN OTHER MODULES
  • Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Ignition ON.
  • Wait 10 seconds.
  • Using a diagnostic scan tool, retrieve all continuous memory Diagnostic Trouble Codes (DTCs).

Is DTC U0155:00 set in other modules on the network?
Yes GO to R7
No GO to R8

R7 CHECK FOR CORRECT IPC (INSTRUMENT PANEL CLUSTER) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the IPC electrical connector (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect IPC electrical connector. Make sure it seats and latches correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new IPC. Refer to the appropriate Removal and Installation procedure in Section 413-01.
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

R8 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST S: U0253:00

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Control Logic, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC U0253:00 Lost Communication With Accessory Protocol Interface Module: No Sub Type Information This DTC sets in the HVAC control module if data messages received from the APIM are missing for more than 5 seconds.

Possible Sources

  • Vehicle communication bus
  • APIM
  • HVAC control module
S1 VERIFY THE CUSTOMER CONCERN
  • Ignition ON.
  • Verify there is an observable symptom present.

Is an observable symptom present?
Yes GO to S2
No CLEAR the DTC . The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

S2 CHECK THE COMMUNICATION NETWORK
  • Using a diagnostic scan tool, carry out the network test.

Does the APIM pass the network test?
Yes GO to S3
No DIAGNOSE the APIM does not communicate with the diagnostic scan tool,
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).

S3 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE APIM (SYNC MODULE) SELF-TEST
  • Using a diagnostic scan tool, carry out the APIM self-test.

Are any Diagnostic Trouble Codes (DTCs) recorded?
Yes REFER to the appropriate procedure in Group 415.
No GO to S4

S4 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE (HVAC) HEATING, VENTILATION AND AIR CONDITIONING CONTROL MODULE SELF-TEST
  • Using a diagnostic scan tool, carry out the HVAC control module self-test.

Is DTC U3003:16 or DTC U3003:17 recorded?
Yes For U3003:16 GO to Pinpoint Test AD
For U3003:17 GO to Pinpoint Test AE
No GO to S5

S5 RECHECK THE (HVAC) HEATING, VENTILATION AND AIR CONDITIONING CONTROL MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

NOTE: If new modules were installed prior to the Diagnostic Trouble Code (DTC) being set, the module configuration can be incorrectly set during the Programmable Module Installation (PMI) or the Programmable Module Installation (PMI) may not have been carried out.

  • Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Ignition ON.
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the HVAC control module self-test.

Is DTC U0253:00 still present?
Yes GO to S6
No CLEAR the DTC . The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

S6 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0253:00 SET IN OTHER MODULES
  • Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Ignition ON.
  • Wait 10 seconds.
  • Using a diagnostic scan tool, retrieve all continuous memory Diagnostic Trouble Codes (DTCs).

Is DTC U0253:00 set in other modules on the network?
Yes GO to S7
No GO to S8

S7 CHECK FOR CORRECT APIM (SYNC MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the APIM electrical connector (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect APIM electrical connector. Make sure it seats and latches correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,
   VIN required to access Guided Routine (APIM)
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

S8 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST T: U1000:00

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Control Logic, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC U1000:00 Solid State Driver Protection Active -Driver Disabled: No Sub Type Information This DTC sets in the HVAC control module Field-Effect Transistor (FET) protective circuit strategy for its actuator outputs has reached 1/3, 2/3 or 3/3 maximum.

Possible Sources

  • Vehicle communication bus
  • Incomplete or improper PMI procedures
  • HVAC control module
T1 RECHECK THE (HVAC) HEATING, VENTILATION AND AIR CONDITIONING CONTROL MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

NOTE: If new modules were installed prior to the Diagnostic Trouble Code (DTC) being set, the module configuration may be incorrectly set during the Programmable Module Installation (PMI) or the Programmable Module Installation (PMI) may not have been carried out.

  • Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Ignition ON.
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the HVAC control module self-test.

Is U1000:00 present?
Yes For DTC U1000:00, REPAIR all HVAC control module Non Communication Diagnostic Trouble Codes first, then CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the HVAC control module self-test. TEST for normal operations.
No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

PINPOINT TEST U: B1A63:11, B1A63:15, B1A64:11, B1A64:15

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The sunload sensor supplies information to the HVAC control module indicating the sunload intensity on the vehicle and the HVAC control module adjusts the system based on that information. REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC B1A63:11 Right Solar Sensor: Circuit Short To Ground Module senses a short to ground from the right sunload sensor feedback circuit.
HVAC B1A63:15 Right Solar Sensor: Circuit Short To Battery Or Open Module senses an open or a short to voltage from the right sunload sensor feedback circuit.
HVAC B1A64:11 Left Solar Sensor: Circuit Short To Ground Module senses a short to ground from the left sunload sensor feedback circuit.
HVAC B1A64:15 Left Solar Sensor: Circuit Short To Battery Or Open Module senses an open or a short to voltage from the left sunload sensor feedback circuit.

Possible Sources

  • Wiring, terminals or connectors
  • Autolamp and sunload sensor
  • HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

U1 CHECK THE SUNLOAD SENSOR CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect Sunload sensor C286 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C286-1   Ground
      C286-2   Ground
      C286-3   Ground
      C286-4   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to U2

U2 CHECK THE SUNLOAD SENSOR CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C286-1   Ground
      C286-2   Ground
      C286-3   Ground
      C286-4   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to U3
No REPAIR the circuit.

U3 CHECK THE SUNLOAD SENSOR CIRCUITS FOR AN OPEN
  • Disconnect BCM C2280D.
  • Disconnect HVAC control module C228B.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C286-1   C228B-22
      C286-3   C228B-21

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C286-2   C2280D-52
      C286-4   C2280D-39

Are the resistances less than 3 ohms?
Yes GO to U4
No REPAIR the circuit.

U4 CHECK THE SUNLOAD SENSOR CIRCUITS FOR A SHORT TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C286-1   C286-2
      C286-1   C286-3
      C286-1   C286-4
      C286-2   C286-3
      C286-2   C286-4
      C286-3   C286-4

Are the resistances greater than 10,000 ohms?
Yes INSTALL a new sunload sensor.
REFER to: Sunload Sensor (412-00 Climate Control System - General Information, Removal and Installation). CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the HVAC control module self-test. If the DTC returns, GO to U5
No REPAIR the circuits.

U5 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST V: B10B3:11, B10B3:15, B10B4:11, B10B4:15, B10B5:11, B10B5:15, B10B6:11, B10B6:15

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The air discharge sensors supply a varying voltage to the HVAC control module based on the temperature of the air being discharged from the vent. The HVAC control module adjusts the system based on the voltage from each sensor.

Each air discharge sensor is supplied voltage from the HVAC control module and all sensors share a common sensor ground. An open, a short to ground, a short to voltage on one or more of these circuits or a failed air discharge sensor causes the HVAC control module to set one or more Diagnostic Trouble Codes (DTCs). REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC B10B3:11 Right Panel Air Discharge Temperature: Circuit Short To Ground Module senses erratic voltages from the air discharge temperature sensor.
HVAC B10B3:15 Right Panel Air Discharge Temperature: Circuit Short To Battery Or Open Module senses erratic voltages from the air discharge temperature sensor.
HVAC B10B4:11 Right Floor Air Discharge Temperature: Circuit Short To Ground Module senses erratic voltages from the air discharge temperature sensor.
HVAC B10B4:15 Right Floor Air Discharge Temperature: Circuit Short To Battery Or Open Module senses erratic voltages from the air discharge temperature sensor.
HVAC B10B5:11 Left Panel Air Discharge Temperature: Circuit Short To Ground Module senses erratic voltages from the air discharge temperature sensor.
HVAC B10B5:15 Left Panel Air Discharge Temperature: Circuit Short To Battery Or Open Module senses erratic voltages from the air discharge temperature sensor.
HVAC B10B6:11 Left Floor Air Discharge Temperature: Circuit Short To Ground Module senses erratic voltages from the air discharge temperature sensor.
HVAC B10B6:15 Left Floor Air Discharge Temperature: Circuit Short To Battery Or Open Module senses erratic voltages from the air discharge temperature sensor.

Possible Sources

  • Wiring, terminals or connectors
  • Air discharge temperature sensor
  • HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

V1 CHECK THE AIR DISCHARGE TEMPERATURE SENSOR OUTPUT VOLTAGE
  • Ignition OFF.
  • Disconnect the suspect air discharge temperature sensor:
    • Driver Side Footwell (Floor) Air Discharge Temperature Sensor C2436
    • Passenger Side Footwell (Floor) Air Discharge Temperature Sensor C2437
    • Driver Side Register (Panel) Air Discharge Temperature Sensor C2438
    • Passenger Side Register (Panel) Air Discharge Temperature Sensor C2439
  • Ignition ON.
  • On the HVAC controls, select PANEL mode.
  • For the Driver Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2436-1   C2436-3
  • For the Passenger Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2437-1   C2437-3
  • For the Driver Side Register (Panel) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2438-1   C2438-3
  • For the Passenger Side Register (Panel) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2439-1   C2439-3

Are the voltages between 4.7 and 5.1 volts?
Yes INSTALL a new air discharge temperature sensor. REFER to the appropriate Removal and Installation procedure in Group 412-00.
CLEAR the Diagnostic Trouble Codes (DTCs). REPEAT the self-test. If the DTC returns, GO to V6
No GO to V2

V2 CHECK THE AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect HVAC control module C228A and C228B .
  • Ignition ON.
  • For the Driver Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2436-1   Ground
      C2436-3   Ground
  • For the Passenger Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2437-1   Ground
      C2437-3   Ground
  • For the Driver Side Register (Panel) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2438-1   Ground
      C2438-3   Ground
  • For the Passenger Side Register (Panel) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2439-1   Ground
      C2439-3   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to V3

V3 CHECK THE AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • For the Driver Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2436-1   Ground
      C2436-3   Ground
  • For the Passenger Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2437-1   Ground
      C2437-3   Ground
  • For the Driver Side Register (Panel) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2438-1   Ground
      C2438-3   Ground
  • For the Passenger Side Register (Panel) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2439-1   Ground
      C2439-3   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to V4
No REPAIR the circuit.

V4 CHECK THE AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR AN OPEN
  • For the Driver Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2436-1   C228B-4
      C2436-3   C228A-2
  • For the Passenger Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2437-1   C228B-10
      C2437-3   C228A-2
  • For the Driver Side Register (Panel) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2438-1   C228B-5

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2438-3   C228A-2
  • For the Passenger Side Register (Panel) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2439-1   C228B-11

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2439-3   C228A-2

Are the resistances less than 3 ohms?
Yes GO to V5
No REPAIR the circuit.

V5 CHECK AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO TOGETHER
  • For the Driver Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2436-1   C2436-3
  • For the Passenger Side Footwell (Floor) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2437-1   C2437-3
  • For the Driver Side Register (Panel) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2438-1   C2438-3
  • For the Passenger Side Register (Panel) Air Discharge Temperature Sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2439-1   C2439-3

Are the resistances greater than 10,000 ohms?
Yes INSTALL a new air discharge temperature sensor. REFER to the appropriate Removal and Installation procedure in Group 412-00.
CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the HVAC control module self-test. If the DTC returns, GO to V6
No REPAIR the circuit.

V6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST W: P193E

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The PCM controls the A/C compressor clutch field coil based on messages received from the BCM over the HS-CAN . When the HVAC control module determines it is necessary to activate the A/C compressor, either due to driver request or due to automatic climate control settings, the HVAC control module sends a message to the BCM over the MS-CAN , the BCM then sends a message to the PCM to activate the A/C compressor. REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

An internal failure of the PCM , BCM or HVAC control module; or a failure in the MS-CAN or HS-CAN causes the PCM to set a DTC .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P193E:00 A/C Clutch Request Signal: No Sub Type Information This DTC sets when the PCM does not receive the A/C enable request from the BCM .

Possible Sources

  • Network concerns
  • BCM
  • PCM
  • HVAC control module
W1 VERIFY THE CUSTOMER CONCERN
  • Ignition ON.
  • Verify there is an observable symptom present.

Is an observable symptom present?
Yes GO to W2
No CLEAR the DTC . The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

W2 CHECK THE COMMUNICATION NETWORK
  • Using a diagnostic scan tool, carry out the network test.

Do the BCM , PCM and the HVAC control module pass the network test?
Yes GO to W3
No DIAGNOSE the BCM , HVAC control module or the PCM does not communicate with the diagnostic scan tool.
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).

W3 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) REQUEST SIGNAL (AC_REQ) PID (PARAMETER IDENTIFICATION)
  • Start the engine.
  • Using a diagnostic scan tool, monitor the

    Access the  PCM  and monitor the  AC_REQ  PID

    .
  • On the HVAC controls, select PANEL mode, then press the A/C button (indicator ON).

Does the AC_REQ PID display YES when the A/C button indicator is illuminated?
Yes GO to W7
No GO to W4

W4 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE A/C (AIR CONDITIONING) SWITCH (CC_SW_AC) PID (PARAMETER IDENTIFICATION)
  • Using a diagnostic scan tool, monitor the

    Access the  HVAC  and monitor the  CC_SW_AC  PID

    while pressing and releasing the A/C button.

Does the PID display ON when the A/C button indicator is illuminated?
Yes GO to W6
No GO to W5

W5 VERIFY CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors.
  • Repair:
    • corrosion (install new connector or terminals – clean module pins)
    • damaged or bent pins – install new terminals or pins
    • pushed-out pins – install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

W6 VERIFY CORRECT BCM (BODY CONTROL MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all BCM electrical connectors.
  • Repair:
    • corrosion (install new connector or terminals – clean module pins)
    • damaged or bent pins – install new terminals or pins
    • pushed-out pins – install new pins as necessary
  • Connect all BCM electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCM .
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

W7 VERIFY CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all PCM electrical connectors.
  • Repair:
    • corrosion (install new connector or terminals – clean module pins)
    • damaged or bent pins – install new terminals or pins
    • pushed-out pins – install new pins as necessary
  • Connect all PCM electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,
   VIN required to access Guided Routine (PCM)
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST X: C1B14:11, C1B14:12

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Reference voltage is supplied to the climate control actuators and one sensor from the HVAC control module on one common circuit and the signal returns to the HVAC control module on one common circuit. All components that share these two circuits are listed in this pinpoint test. Access to these components are difficult.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC C1B14:11 Sensor Supply Voltage A: Circuit Short To Ground This DTC sets when the module senses less than 4.5 volts on the actuator voltage supply circuit, indicating a short to ground.
HVAC C1B14:12 Sensor Supply Voltage A: Circuit Short To Battery This DTC sets when the module senses greater than 5.5 volts on the actuator voltage supply circuit, indicating a short to voltage.

Possible Sources

  • Wiring, terminals or connectors
  • HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

X1 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, carry out HVAC control module self-test.

Is DTC C1B14:11 or C1B14:12 present?
Yes GO to X2
No VERIFY a customer concern. REFER to the symptom chart in this section.

X2 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE REFERENCE VOLTAGE AND SIGNAL RETURN CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect HVAC control module C228A .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-3   Ground
      C228A-2   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to X3

X3 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE REFERENCE VOLTAGE AND SIGNAL RETURN CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-3   Ground
      C228A-2   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to X4
No REPAIR the circuit.

X4 CHECK THE REFERENCE VOLTAGE CIRCUIT AND THE SIGNAL RETURN CIRCUIT FOR A SHORT TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-3   C228A-2

Is the resistance greater than 200 ohms?
Yes GO to X6
No GO to X5

X5 CHECK THE A/C (AIR CONDITIONING) COMPONENTS
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-3   C228A-2
  • While measuring the resistance, disconnect the following components one at a time, in order. Stop disconnecting components if the measured resistance rises above 200 ohms.
    • Air distribution door actuator C236
    • Air inlet door actuator C289
    • Driver side temperature door actuator C2091
    • Passenger side temperature door actuator C2092
    • In-vehicle temperature and humidity sensor C910

Did the resistance rise above 200 ohms?
Yes INSTALL a new actuator or sensor (the last one to be disconnected). REFER to the appropriate Removal and Installation procedure in group 412-00. When installing an actuator, CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected.
No REPAIR the circuits.

X6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST Y: B12CA:11, B12CA:15

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The instrument panel console switch assembly - auto start-stop deactivation switch, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC B12CA:11 Start/Stop 'Eco-Start' Status Indicator: Circuit Short To Ground This DTC sets when the HVAC control module senses lower than expected voltage on the circuits, indicating a short to ground.
HVAC B12CA:15 Start/Stop 'Eco-Start' Status Indicator: Circuit Short To Battery Or Open This DTC sets when the HVAC control module senses greater than expected voltage on the circuits, indicating a short to voltage.

Possible Sources

  • Wiring, terminals or connectors
  • Instrument panel console switch assembly (Auto Start-Stop Deactivation Switch)
  • HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Y1 CHECK THE AUTO START-STOP DEACTIVATION SWITCH INDICATOR AND LED (LIGHT EMITTING DIODE) CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect HVAC control module C228A and C228B .
  • Disconnect Instrument Panel Console Switch Assembly (Auto Start-Stop Deactivation Switch) C3010 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-14   Ground

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228B-23   Ground
      C228B-24   Ground

Is any voltage present?
Yes REPAIR the affected circuits.
No GO to Y2

Y2 CHECK THE AUTO START-STOP DEACTIVATION SWITCH INDICATOR AND LED (LIGHT EMITTING DIODE) CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-14   Ground

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228B-23   Ground
      C228B-24   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to Y3
No REPAIR the affected circuits.

Y3 CHECK THE AUTO START-STOP DEACTIVATION SWITCH INDICATOR AND LED (LIGHT EMITTING DIODE) CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228A-14   C3010-1

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228B-23   C3010-4
      C228B-24   C3010-11

Are the resistances less than 3 ohms?
Yes GO to Y4
No REPAIR the affected circuits.

Y4 CHECK THE AUTO START-STOP DEACTIVATION SWITCH INDICATOR AND LED (LIGHT EMITTING DIODE) CIRCUITS FOR A SHORT TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3010-1   C3010-4
      C3010-1   C3010-11
      C3010-4   C3010-11

Are the resistances greater than 10,000 ohms?
Yes INSTALL a new Auto Start-Stop Deactivation Switch. CLEAR codes and CARRY out the HVAC control module self-test. TEST the system for normal operation. If the concern is still present, GO to Y5
No REPAIR the circuits.

Y5 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly. WAIT 20 seconds for the range calibration to be executed after reconnecting of the module before any further assessment or measurement is made. If the actuator range calibration does not start, or has been interrupted, carry out the HVAC Calibration Routine, using a diagnostic scan tool.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST Z: B10B8:63

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Climate control system buttons held too long may set this DTC .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC B10B8:63 Push Buttons: Circuit/Component Protection Time-Out Buttons held too long may set this DTC .

Possible Sources

  • HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Z1 CLEAN HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE BUTTONS
  • Ignition OFF.
  • Disconnect all HVAC control module connectors.
  • Attempt to clean the buttons on the HVAC controls. For additional information about recommended cleaning products, refer to the Owner's Literature.
  • Connect all disconnected electrical connectors. Make sure they seat and latch correctly.
  • Ignition ON.
  • Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs) on the module in question. Carry out the HVAC control module self-test.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes GO to Z2
No The system is operating correctly at this time. The concern may have been caused by a stuck or a dirty button.

Z2 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors.
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly. WAIT 20 seconds for the range calibration to be executed after reconnecting of the module before any further assessment or measurement is made. If the actuator range calibration does not start, or has been interrupted, carry out the HVAC Calibration Routine, using a diagnostic scan tool.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST AA: ACCM (AIR CONDITIONING CONTROL MODULE) A/C (AIR CONDITIONING) ELECTRIC COMPRESSOR INOPERATIVE

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The ACCM is an integral part of the A/C electric compressor and cannot be removed from or serviced separately. The ACCM has both low voltage and high voltage electrical connections. The ACCM requires a low voltage system operating voltage between 9 and 16 volts. The ACCM also requires high voltage system operating voltage between 140 and 350 volts. The ACCM has a single ground circuit located in the engine compartment wiring harness. Excessive resistance or an open in one or more of these circuits, a discharged battery or an inoperative charging system results in the ACCM setting a DTC . REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
ACCM P0562:00 System Voltage Low: No Sub Type Information This DTC sets when the ACCM detects low voltage system voltage is below 8.5 volts. The A/C electric compressor motor is stopped. A/C doesn't work.
ACCM P0563:00 System Voltage High: No Sub Type Information This DTC sets when the ACCM detects low voltage system voltage is above 16.5 volts. The A/C electric compressor motor is stopped. A/C doesn't work.
ACCM P0AFA:16 Hybrid/EV Battery System Voltage Low: Circuit Voltage Below Threshold This DTC sets when the ACCM detects high voltage system voltage drops below 100 volts. The A/C electric compressor motor is stopped. A/C doesn't work.
ACCM P0AFB:17 Hybrid/EV Battery System Voltage High: Circuit Voltage Above Threshold This DTC sets when the ACCM detects High voltage system voltage greater than 494 volts. The A/C electric compressor motor is stopped. A/C doesn't work.
ACCM P0AFB:1C Hybrid/EV Battery System Voltage High: Circuit Voltage Out Of Range This DTC sets when the ACCM detects High voltage system voltage greater than 650 volts. The A/C electric compressor motor is stopped. A/C doesn't work.
ACCM B11EE:19 A/C Compressor: Circuit Current Above Threshold This DTC sets when the ACCM detects excessive current on the low voltage circuit. The A/C electric compressor motor is stopped. A/C doesn't work.
ACCM B11EE:4B A/C Compressor: Over Temperature This DTC sets when the ACCM detects excessive internal heat. The A/C electric compressor motor is stopped. A/C doesn't work.
ACCM B11EE:92 A/C Compressor: Performance Or Incorrect Operation This DTC sets when the ACCM detects the number of stops due to "software overcurrent" or "start failure" exceeds a specified value. The A/C electric compressor motor is stopped. A/C doesn't work.
SOBDMC P0D6D:00 A/C Compressor 'A' Motor Voltage 'A' Low: No Sub Type Information Signal received from ACCM indicates motor voltage out of range.
SOBDMC P0D6F:00 A/C Compressor 'A' Motor Current High: No Sub Type Information Test fails when signal from ACCM indicates motor current too high.
SOBDMC P0D71:00 A/C Compressor Control Module Internal Temperature Sensor 'A' Performance: No Sub Type Information Test fails when ACCM indicates internal temperature sensor performance fault.
SOBDMC P26FD:00 A/C Compressor 'A' Internal Control Module Performance: No Sub Type Information Test fails when ACCM indicates internal control module performance fault
SOBDMC P2D41:00 A/C Compressor 'A' Motor Voltage 'B' Performance: No Sub Type Information Test fails when ACCM indicates motor voltage "B" fault.
SOBDMC P2D42:00 A/C Compressor 'A' Motor Voltage 'B' Low: No Sub Type Information Test fails when ACCM indicates motor voltage "B" fault.
SOBDMC P2D44:00 A/C Compressor 'A' Motor Performance: No Sub Type Information Test fails when ACCM indicates motor performance fault.

Possible Sources

  • Fuse
  • Wiring, terminals or connectors
  • ACCM [ A/C electric compressor]
AA1 CHECK THE DCDC (DIRECT CURRENT/DIRECT CURRENT CONVERTER CONTROL MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using a diagnostic scan tool, carry out the DCDC self-test.

Are any DCDC Diagnostic Trouble Codes (DTCs) present?
Yes REFER to the appropriate procedure in Group 414.
No GO to AA2

AA2 CHECK THE BECM (BATTERY ENERGY CONTROL MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using a diagnostic scan tool, carry out the BECM self-test.

Are any BECM Diagnostic Trouble Codes (DTCs) present?
Yes REFER to the appropriate procedure in Group 414.
No GO to AA3

AA3 RECHECK THE ACCM (AIR CONDITIONING CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTE: Before carrying out this pinpoint test, ensure the high voltage battery is at least 50 % charged. For charging information, refer to the appropriate workshop manual section 414-03.

NOTE: Before testing of the Air Conditioning Control Module (ACCM) with a diagnostic scan tool can be performed on Hybrid Electric Vehicle (HEV), the vehicle must be in Ready to Drive mode. Switch the ignition on with transmission selector lever in position P. Look for the green ready indicator light to appear in the lower right portion of the instrument cluster and a ready to drive message to appear in the middle of the left cluster screen.

  • Ignition ON.
  • Place vehicle in Ready to Drive mode.
  • Using a diagnostic scan tool, clear the ACCM Diagnostic Trouble Codes (DTCs).
  • Using a diagnostic scan tool, carry out the ACCM self-test.

Does DTC P0562:00, P0563:00, P0AFA:16, P0AFB:17, P0AFB:1C, B11EE:19, B11EE:4B or B11EE:92 return?
Yes GO to AA4
No IGNORE the DTC and CONTINUE diagnosing other Diagnostic Trouble Codes (DTCs) or symptoms. GO to the ACCM DTC Chart or Symptom Chart – Climate Control in this section.

AA4 CHECK THE ACCM (AIR CONDITIONING CONTROL MODULE) MAIN ECU VOLTAGE SUPPLY MAINECUV PID (PARAMETER IDENTIFICATION)
  • With the vehicle in Ready to Drive mode, using a diagnostic scan tool, monitor the ACCM

    Access the  ACCM  and monitor the  MAINECUV (V)  PID

    .

Is the voltage PID between 9 volts and 16 volts?
Yes GO to AA7
No GO to AA5

AA5 CHECK THE ACCM (AIR CONDITIONING CONTROL MODULE) LOW VOLTAGE SUPPLY CIRCUIT

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

  • Ignition OFF.
  • Disconnect ACCM C1803A .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1803A-1   Ground

Is the voltage greater than 11 volts?
Yes GO to AA6
No VERIFY BJB fuse 8 (15A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

AA6 CHECK THE ACCM (AIR CONDITIONING CONTROL MODULE) GROUND CIRCUIT
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1803A-4   Ground

Is the resistance less than 3 ohms?
Yes GO to AA7
No REPAIR the circuit.

AA7 CHECK THE ACCM (AIR CONDITIONING CONTROL MODULE) ELECTRIC A/C COMPRESSOR HIGH VOLTAGE SUPPLY PID (PARAMETER IDENTIFICATION)
  • With the vehicle in Ready to Drive mode, using a diagnostic scan tool, monitor the ACCM

    Access the  ACCM  and monitor the  ACCM_CHVS (V)  PID

    .

Is the voltage supply PID between 100 volts and 467 volts?
Yes GO to AA10
No GO to AA8

AA8 CHECK THE ACCM (AIR CONDITIONING CONTROL MODULE) ELECTRIC A/C COMPRESSOR HIGH VOLTAGE CABLES FOR AN OPEN
  • Ignition OFF.
  • Depower the High Voltage Battery system.
  • Disconnect ACCM C1803B .
  • Disconnect For HEV , DCDC C1457A .
  • Disconnect For PHEV , Cabin coolant heater C1815A .
  • Measure:
    Click to display connectors

      HEV


    Positive Lead Measurement / Action Negative Lead
      C1457A-1   C1803B-A
      C1457A-4   C1803B-B

    Click to display connectors

      PHEV


    Positive Lead Measurement / Action Negative Lead
      C1803B-B   C1815A-1
      C1803B-A   C1815A-4

Are the resistances less than 3 ohms?
Yes GO to AA9
No For HEV , INSPECT the high voltage cable between the ACCM and the DCDC for signs of an obvious short condition. INSTALL new (14B322) cable. REFER to the appropriate Removal and Installation procedure in Group 414-03A.
For PHEV , INSPECT the high voltage cable between the ACCM and the Cabin coolant heater for signs of an obvious short condition. INSTALL new (14B322) or (14B323) cable.

AA9 CHECK THE HIGH VOLTAGE LOW CURRENT FUSE

  WARNING: Never install the service disconnect plug when a high-voltage service cover is removed. Always install the cover prior to connecting the service disconnect plug. The cover prevents inadvertent contact with the high voltage which is present at several points under the cover. Failure to follow these instructions may result in serious personal injury or death.

  • Measure the resistance of the high voltage low current fuse.

Is the resistance less than 3 ohms?
Yes GO to AA10
No INSTALL a new (50A) high voltage low current fuse. For HEV , INSPECT the high voltage cable between the ACCM and the DCDC for signs of an obvious short condition. INSTALL new (14B322) cable. Refer to the appropriate Removal and Installation procedure in Group 414-03A.
CLEAR all Diagnostic Trouble Codes (DTCs). TEST the system for normal operation. If the concern is still present, GO to AA10

AA10 CHECK FOR CORRECT ACCM (AIR CONDITIONING CONTROL MODULE) OPERATION

NOTE: Before testing of the Air Conditioning (A/C) electric compressor Air Conditioning Control Module (ACCM) with a diagnostic scan tool can be performed on a Hybrid Electric Vehicle (HEV), the vehicle must be in Ready to Drive mode. Switch the ignition on with transmission selector lever in position P. Look for the green ready indicator light to appear in the lower right portion of the instrument cluster and a ready to drive message to appear in the middle of the left cluster screen.

  • Ignition OFF.
  • Disconnect and inspect all ACCM connectors.
  • Repair:
    • corrosion (install new connector or terminals – clean module pins)
    • damaged or bent pins – install new terminals/pins
    • pushed-out pins – install new pins as necessary
  • Reconnect all ACCM connectors. Make sure they seat and latch correctly.
  • Place vehicle in Ready to Drive mode.
  • Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).
  • Ignition OFF.
  • Wait 10 seconds.
  • Place vehicle in Ready to Drive mode.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new A/C electric compressor.
REFER to: Air Conditioning (A/C) Compressor - 2.5L Duratec – Hybrid (121kW/164PS) (BG) (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST AB: U0100:00

Normal Operation and Fault Conditions

The ACCM and the HVAC control module communicates with the PCM over the CAN . If messages are missing or not received from the PCM , features such as the A/C can be inoperative or can operate incorrectly, or the outside air temperature can be reporting incorrectly. REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
ACCM U0100:00 Lost Communication With ECM/PCM 'A': No Sub Type Information Sets in continuous memory when the ACCM detects network messages are missing from the PCM for more than 5 seconds.
HVAC U0100:00 Lost Communication With ECM/PCM 'A': No Sub Type Information Sets in continuous memory when the HVAC control module detects network messages are missing from the PCM for more than 5 seconds.

Possible Sources

  • Network communication concern
  • ACCM concern
  • HVAC control module concern
  • PCM concern
AB1 VERIFY THE CONCERN
  • Ignition ON.
  • Verify there is an observable symptom present.

Is an observable symptom present?
Yes GO to AB2
No The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

AB2 VERIFY THE DIAGNOSTIC SCAN TOOL COMMUNICATES WITH THE PCM (POWERTRAIN CONTROL MODULE)
  • Connect the diagnostic scan tool to the vehicle.
  • Attempt to establish a vehicle session using the diagnostic scan tool.

Can a vehicle session be established?
Yes GO to AB3
No
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).

AB3 CHECK FOR NON-NETWORK DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using a diagnostic scan tool, carry out the self-test for the ACCM setting the DTC .

Are any non-network Diagnostic Trouble Codes (DTCs) present?
Yes DIAGNOSE all non-network Diagnostic Trouble Codes (DTCs) first. REFER to the DTC Chart in this section.
No GO to AB4

AB4 CHECK FOR PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using a diagnostic scan tool, carry out the PCM self-test.

Are any non-network Diagnostic Trouble Codes (DTCs) present?
Yes REFER to the Diagnosis and Testing in the appropriate 303-14 section.
No GO to AB5

AB5 RECHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0100:00
  • Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs) for the module setting the DTC ( ACCM or HVAC control module).
  • Ignition OFF.
  • Ignition ON.
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the self-test for the module setting the DTC ( ACCM or HVAC control module).

Is DTC U0100:00 still present?
Yes GO to AB6
No The system is operating correctly at this time. The DTC may have set due to high network traffic or an intermittent fault condition.

AB6 CHECK FOR OTHER CAUSES OF NETWORK COMMUNICATION CONCERN

NOTE: If new modules were installed prior to the Diagnostic Trouble Code (DTC) being set, the module configuration can be incorrectly set during the Programmable Module Installation (PMI) or the Programmable Module Installation (PMI) may not have been carried out.

  • Check the vehicle service history for recent service actions related to the PCM and the module setting the DTC ( ACCM or HVAC control module). If recent service history is found:
    • verify correct replacement module was installed
      • vehicle parts build list may be used to verify correct part fitment
    • verify the configuration of replacement module was correct
      • re-configure module using as-built data if prior configuration is suspect
    • verify the module was not obtained from a like vehicle and installed into vehicle with concern
      • return the swapped module to source vehicle and obtain new replacement module
  • Operate the system and determine if the observable symptom is still present.

Is the observable symptom still present?
Yes GO to AB7
No The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

AB7 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all the PCM connectors.
  • Repair:
    • corrosion (install new connectors or terminals - clean module pins)
    • damaged or bent pins - install new terminals pins
    • pushed-out pins - install new pins as necessary
  • Reconnect the PCM connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,
   VIN required to access Guided Routine (PCM)
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST AC: U0111:00

Normal Operation and Fault Conditions

The ACCM communicates with the BECM over the CAN . If messages are missing or not received from the BECM , the A/C can be inoperative.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
ACCM U0111:00 Lost Communication With Battery Energy Control Module 'A': No Sub Type Information Sets in continuous memory when the ACCM detects network messages are missing from the BECM for more than 5 seconds.

Possible Sources

  • Network communication concern
  • ACCM concern
  • BECM concern
AC1 VERIFY THE CONCERN
  • Ignition ON.
  • Verify there is an observable symptom present.

Is an observable symptom present?
Yes GO to AC2
No The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

AC2 CHECK THE NETWORK COMMUNICATION
  • Using a diagnostic scan tool, carry out the network test.

Does the BECM pass the network test?
Yes GO to AC3
No
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).

AC3 CHECK FOR NON-NETWORK DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using a diagnostic scan tool, carry out the self-test for the ACCM setting the DTC .

Are any non-network Diagnostic Trouble Codes (DTCs) present?
Yes DIAGNOSE all non-network Diagnostic Trouble Codes (DTCs) first. REFER to the DTC Chart in this section.
No GO to AC4

AC4 CHECK FOR BECM (BATTERY ENERGY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using a diagnostic scan tool, carry out the BECM self-test.

Are any non-network Diagnostic Trouble Codes (DTCs) present?
Yes REFER to the appropriate procedure in Group 414.
No GO to AC5

AC5 RECHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0111:00
  • Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs) for the module in question setting the DTC .
  • Ignition OFF.
  • Ignition ON.
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the self-test for the module in question setting the DTC .

Is DTC U0111:00 still present?
Yes GO to AC6
No The system is operating correctly at this time. The DTC may have set due to high network traffic or an intermittent fault condition.

AC6 CHECK FOR OTHER CAUSES OF NETWORK COMMUNICATION CONCERN

NOTE: If new modules were installed prior to the Diagnostic Trouble Code (DTC) being set, the module configuration can be incorrectly set during the Programmable Module Installation (PMI) or the Programmable Module Installation (PMI) may not have been carried out.

  • Check the vehicle service history for recent service actions related to the BECM and the ACCM setting the DTC . If recent service history is found:
    • verify correct replacement module was installed
      • vehicle parts build list may be used to verify correct part fitment
    • verify the configuration of replacement module was correct
      • re-configure module using as-built data if prior configuration is suspect
    • verify the module was not obtained from a like vehicle and installed into vehicle with concern
      • return the swapped module to source vehicle and obtain new replacement module
  • Operate the system and determine if the observable symptom is still present.

Is the observable symptom still present?
Yes GO to AC7
No The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

AC7 CHECK FOR CORRECT BECM (BATTERY ENERGY CONTROL MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all the BECM connectors.
  • Repair:
    • corrosion (install new connectors or terminals - clean module pins)
    • damaged or bent pins - install new terminals pins
    • pushed-out pins - install new pins as necessary
  • Reconnect the BECM connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BECM . REFER to the appropriate procedure in Group 414.
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST AD: U3003:16

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The modules monitor the supplied voltage and set a DTC if it falls below a threshold.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC U3003:16 Battery Voltage: Circuit Voltage Below Threshold HVAC control module senses lower than expected system voltage.

Possible Sources

  • Wiring, terminals or connectors
  • Charging system concern
  • Low battery
  • HVAC control module
AD1 RECHECK FOR LOW VOLTAGE DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs) for the module in question setting the low voltage DTC .
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the self-test for the module in question setting the low voltage DTC .

Is DTC U3003:16 still present?
Yes GO to AD2
No The system is operating correctly at this time. The DTC may have been set due to a previous low battery voltage condition.

AD2 CHECK FOR CHARGING SYSTEM DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using a diagnostic scan tool, carry out the PCM self-test.

Are any voltage-related Diagnostic Trouble Codes (DTCs) present?
Yes DIAGNOSE the charging system concern. REFER to the appropriate Diagnosis and Testing in section 414.
No GO to AD3

AD3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE
  • Ignition OFF.
  • Check the battery condition and verify the battery is fully charged. Refer to the appropriate procedure in Group 414.

Is the battery OK and fully charged?
Yes GO to AD4
No DIAGNOSE the battery. REFER to the appropriate procedure in Group 414.

AD4 COMPARE THE SUSPECT MODULE VOLTAGE SUPPLY PID (PARAMETER IDENTIFICATION) TO THE BATTERY VOLTAGE
  • Ignition ON.
  • Measure and record the battery voltage.
  • For the suspect module, monitor the voltage supply PID :
    • Access the  HVAC  and monitor the  VPWR (V)  PID


Is the voltage reading within 0.2 volt of the recorded battery voltage?
Yes For the HVAC control module, GO to AD7
No GO to AD5

AD5 CHECK THE MODULE VOLTAGE SUPPLY CIRCUIT FOR HIGH RESISTANCE
  • Ignition OFF.
  • Disconnect the suspect module.
  • Ignition ON.
  • Measure and record the battery voltage.
  • For the suspect module, measure:
    Click to display connectors

      HVAC control module


    Positive Lead Measurement / Action Negative Lead
      C228A-26   Ground

Is the voltage reading within 0.2 volt of the recorded battery voltage?
Yes GO to AD6
No REPAIR the circuit for high resistance.

AD6 CHECK THE SUSPECT MODULE GROUND CIRCUIT FOR HIGH RESISTANCE
  • For the suspect module, measure:
    Click to display connectors

      HVAC control module


    Positive Lead Measurement / Action Negative Lead
      C228A-26   C228A-1

Is the voltage reading within 0.2 volt of the recorded battery voltage?
Yes For the HVAC control module, GO to AD7
No REPAIR the circuit for high resistance.

AD7 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors.
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly. WAIT 20 seconds for the range calibration to be executed after reconnecting of the module before any further assessment or measurement is made. If the actuator range calibration does not start, or has been interrupted, CARRY OUT the HVAC Calibration Routine, using a diagnostic scan tool.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST AE: U3003:17

Normal Operation and Fault Conditions

The modules monitor the supplied voltage and set a DTC if it rises above a threshold.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC U3003:17 Battery Voltage: Circuit Voltage Above Threshold Sets in continuous memory and during the on-demand self-test when the HVAC control module detects the supply voltage is greater than 16 volts. This DTC may also set in the HVAC control module due to battery charging or vehicle jump starting events.

Possible Sources

  • Charging system concern
  • HVAC control module

NOTE: Diagnostic Trouble Code (DTC) U3003:17 may be stored in the module memory due to past battery charging or vehicle jump starting events.

AE1 CHECK FOR HIGH VOLTAGE DIAGNOSTIC TROUBLE CODES (DTCS) SET IN OTHER MODULES
  • Ignition ON.
  • Using a diagnostic scan tool, retrieve the Continuous Memory Diagnostic Trouble Codes (CMDTCs).

Are any charging or over-voltage related voltage Diagnostic Trouble Codes (DTCs) present in multiple modules?
Yes DIAGNOSE the overcharging condition. REFER to the appropriate Diagnosis and Testing in section 414-00.
No GO to AE2

AE2 CHECK THE BATTERY VOLTAGE WITH THE ENGINE RUNNING
  • Turn off all interior/exterior lights and accessories.
  • Start and run the engine at approximately 2,000 RPM for 3 minutes while monitoring the battery voltage.

Does the battery voltage rise to 15.5 volts or higher?
Yes DIAGNOSE the overcharging condition. REFER to the appropriate Diagnosis and Testing in section 414-00.
No GO to AE3

AE3 RECHECK FOR THE HIGH VOLTAGE DTC (DIAGNOSTIC TROUBLE CODE)
  • Ignition OFF.
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the suspect module.
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the self-test for the suspect module setting the high voltage DTC .

Is DTC U3003:17 still present?
Yes For the HVAC control module, GO to AE4
No The system is operating correctly at this time. The DTC may have been set previously during battery charging or while jump starting the vehicle.

AE4 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors.
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly. WAIT 20 seconds for the range calibration to be executed after reconnecting of the module before any further assessment or measurement is made. If the actuator range calibration does not start, or has been interrupted, CARRY OUT the HVAC Calibration Routine, using a diagnostic scan tool.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST AF: BUS OFF

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
ACCM U0001:88 High Speed CAN Communication Bus: Bus Off The module could not communicate on the network at a point in time. The fault is not currently present since the module had to communicate with the diagnostic scan tool to report this DTC .

Possible Sources

  • Intermittent fault with the CAN
AF1 DIAGNOSE THE INTERMITTENT FAULT

NOTE: The module was unable to communicate on the network at a point in time. The fault is not currently present since the module had to communicate with the diagnostic scan tool to report this DTC .

  • Ignition ON.
  • Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs) for the module in question.
  • Wait at least 10 seconds.
  • Using a diagnostic scan tool, carry out the self-test for the module in question.
  • Verify the integrity of the connectors and wiring for the CAN .

Is the DTC still present?
Yes DIAGNOSE the CAN in question.
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).
No The system is operating correctly at this time. VERIFY the integrity of the connectors and wiring for the CAN in question.

PINPOINT TEST AG: INVALID DATA RECEIVED

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC U0401:00 Invalid Data Received from ECM/PCM A: No Sub Type Information Sets when the HVAC control module receives invalid network data from the PCM .
HVAC U0401:82 Invalid Data Received from ECM/PCM A: Alive/Sequence Counter Incorrect/Not Updated Sets when the HVAC control module receives invalid network data from the PCM .
HVAC U0422:68 Invalid Data Received From Body Control Module: Event Information Sets when the HVAC control module receives invalid network data from the BCM .
HVAC U0422:81 Invalid Data Received From Body Control Module: Invalid Serial Data Received Sets when the HVAC control module receives invalid network data from the BCM .
HVAC U0452:82 Invalid Data Received From Restraints Control Module: Alive/Sequence Counter Incorrect/Not Updated Sets when the HVAC control module receives invalid network data from the RCM .

Possible Sources

  • Suspect module
AG1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE MODULE SENDING INVALID DATA
  • Ignition ON.
  • Using a diagnostic scan tool, carry out the self-test for the module in question sending the invalid data.

Are any Diagnostic Trouble Codes (DTCs) present from the module sending the invalid data?
Yes DIAGNOSE the module sending the invalid data. REFER to the appropriate section in the Workshop Manual.
No DIAGNOSE the observable symptom present. REFER to the appropriate Symptom chart in this section.

PINPOINT TEST AH: MODULE CONFIGURATION FAULT

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC U2024:51 Control Module Cal-Config Data: Not Programmed This DTC sets due to incomplete or improper PMI procedures.
HVAC U2100:00 Initial Configuration Not Complete: No Sub Type Information This DTC sets due to incomplete or improper PMI procedures.

Possible Sources

  • Incomplete or incorrect PMI
AH1 CARRY OUT THE PMI (PROGRAMMABLE MODULE INSTALLATION) FOR THE SUSPECT MODULE
  • Ignition ON.
  • Using a diagnostic scan tool, carry out the PMI procedure for the suspect module as directed by the diagnostic scan tool.
  • Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs) for the suspect module.
  • Using a diagnostic scan tool, carry out the self-test for the suspect module.

Is the original DTC still present?
Yes INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The repair is complete.

PINPOINT TEST AI: INTERNAL MODULE FAILURE

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
ACCM B11EE:41 A/C Compressor: General Checksum Failure Sets when the ACCM detects an internal fault.
ACCM U3000:04 Control Module: System Internal Failures Sets when the ACCM detects an internal fault.
ACCM U3000:42 Control Module: General Memory Failure Sets when the ACCM detects an internal fault.
ACCM U3000:49 Control Module: Internal Electronic Failure Sets when the ACCM detects an internal fault.
HVAC U3000:41 Control Module: General Checksum Failure Sets when the HVAC control module detects an internal fault.
HVAC U3000:49 Control Module: Internal Electronic Failure Sets when the HVAC control module detects an internal fault.

Possible Sources

  • Suspect module
AI1 INSTALL A NEW SUSPECT MODULE
  • Ignition OFF.
  • INSTALL a new module in question. REFER to the appropriate Removal and Installation procedure in Group 412-00.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS and follow the instructions for the applicable TSB , GSB , SSM or FSA .
No The repair is complete.

PINPOINT TEST AJ: P2611:00, P2612:00, P2613:00 HIGH VOLTAGE BATTERY COOLANT COOLER SHUT OFF VALVE

Refer to Wiring Diagrams Cell 21 for schematic and connector information.

Normal Operation and Fault Conditions

Battery coolant cooler shut off valve, REFER to: Supplemental Climate Control - System Operation and Component Description (412-03 Supplemental Climate Control, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BCMC P2611:00 A/C Refrigerant Distribution Valve 'A' Control Circuit/Open: No Sub Type Information Test fails when BCMC reports an open circuit on the battery coolant cooler shut off valve control circuit
BCMC P2612:00 A/C Refrigerant Distribution Valve 'A' Control Circuit Low: No Sub Type Information Test fails when BCMC reports a short to ground on the battery coolant cooler shut off valve control circuit
BCMC P2613:00 A/C Refrigerant Distribution Valve 'A' Control Circuit High: No Sub Type Information Test fails when BCMC reports a short to power on the battery coolant cooler shut off valve control circuit
SOBDMC P2611:00 A/C Refrigerant Distribution Valve 'A' Control Circuit/Open: No Sub Type Information Test fails when BCMC reports an open circuit on the battery coolant cooler shut off valve control circuit
SOBDMC P2612:00 A/C Refrigerant Distribution Valve 'A' Control Circuit Low: No Sub Type Information Test fails when BCMC reports a short to ground on the battery coolant cooler shut off valve control circuit
SOBDMC P2613:00 A/C Refrigerant Distribution Valve 'A' Control Circuit High: No Sub Type Information Test fails when BCMC reports a short to power on the battery coolant cooler shut off valve control circuit

Possible Sources

  • Wiring, terminals or connectors
  • High Voltage Battery Coolant Cooler Shut Off Valve
  • BCMC

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

AJ1 CHECK THE HIGH VOLTAGE BATTERY COOLANT COOLER SHUT OFF VALVE CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect BCMC C1002 .
  • Disconnect High Voltage Battery Coolant Cooler Shut Off Valve C1811 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1811-1   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to AJ2

AJ2 CHECK THE HIGH VOLTAGE BATTERY COOLANT COOLER SHUT OFF VALVE CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1811-1   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to AJ3
No REPAIR the circuit.

AJ3 CHECK THE HIGH VOLTAGE BATTERY COOLANT COOLER SHUT OFF VALVE CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1811-1   C1002-3
      C1811-2   Ground

Are the resistances less than 3 ohms?
Yes GO to AJ4
No REPAIR the affected circuits.

AJ4 CHECK THE HIGH VOLTAGE BATTERY COOLANT COOLER SHUT OFF VALVE CIRCUITS FOR A SHORT TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1811-1   C1811-2

Is the resistance greater than 10,000 ohms?
Yes INSTALL a new high voltage battery coolant cooler.
REFER to: High Voltage Battery Coolant Cooler (412-03 Supplemental Climate Control, Removal and Installation).
CLEAR codes and CARRY OUT the SOBDMC self-test. TEST the system for normal operation. If the concern is still present, GO to AJ5
No REPAIR the circuits.

AJ5 CHECK FOR CORRECT BCMC (BODY CONTROL MODULE C) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all BCMC electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all BCMC electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCMC .
REFER to: Body Control Module C (BCMC) (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST AK: THE A/C (AIR CONDITIONING) COMPRESSOR RELIEF VALVE DISCHARGING

Normal Operation and Fault Conditions

The A/C pressure relief valve normal open pressure is 3,447-4,137 kPa (500-600 psi).

Possible Sources

  • High system pressure
  • A/C pressure relief valve
AK1 DIAGNOSE THE A/C (AIR CONDITIONING) COMPRESSOR RELIEF VALVE
  • Start the engine.
  • On the HVAC controls, set the temperature to full cold, select PANEL and select the A/C button (indicator on).
  • Using the appropriate manifold gauge set, check the A/C high side system pressure.

Is the high side system pressure above the A/C pressure relief valve open pressure [3,447-4,137 kPa (500-600 psi)]?
Yes REPAIR the A/C system for a restriction.
REFER to: Refrigerant System Tests - 1.5L EcoBoost (132kW/180PS) – I3 (Y1) (412-00 Climate Control System - General Information, General Procedures).
REFER to: Refrigerant System Tests - 2.0L EcoBoost (177kW/240PS) – MI4 (412-00 Climate Control System - General Information, General Procedures).
REFER to: Refrigerant System Tests - 2.5L Duratec – Hybrid (121kW/164PS) (BG) (412-00 Climate Control System - General Information, General Procedures).
No INSTALL a new A/C compressor.
REFER to: Air Conditioning (A/C) Compressor - 1.5L EcoBoost (132kW/180PS) – I3 (Y1) (412-00 Climate Control System - General Information, Removal and Installation).
REFER to: Air Conditioning (A/C) Compressor - 2.0L EcoBoost (177kW/240PS) – MI4 (412-00 Climate Control System - General Information, Removal and Installation).
REFER to: Air Conditioning (A/C) Compressor - 2.5L Duratec – Hybrid (121kW/164PS) (BG) (412-00 Climate Control System - General Information, Removal and Installation).

PINPOINT TEST AL: THE ELECTRIC BOOSTER HEATER IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Electric Booster Heater, REFER to: Supplemental Climate Control - System Operation and Component Description (412-03 Supplemental Climate Control, Description and Operation).

Possible Sources

  • Fuses
  • Wiring, terminals or connectors
  • Electric booster heater
  • HVAC control module

Visual Inspection and Pre-checks

  • Make sure BJB fuses 83 (40A), 84 (60A), 85 (40A) are OK.
  • Make sure operating conditions for the operation of the electric booster heater are met. Refer to the Description and Operation in section 412-03.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Diagnose and repair all Heating, Ventilation and Air Conditioning (HVAC) control module Diagnostic Trouble Codes (DTCs) before continuing with this pinpoint test.

AL1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE BCM (BODY CONTROL MODULE) SELF-TEST
  • Ignition ON.
  • Using a diagnostic scan tool, carry out the BCM self-test.

Is DTC B153F:08 present?
Yes
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Diagnosis and Testing).
No GO to AL2

AL2 CHECK THE ELECTRIC BOOSTER HEATER CIRCUITS FOR A SHORT TO VOLTAGE
  • Disconnect BJB fuses 83 (40A), 84 (60A), 85 (40A).
  • Disconnect Electric Booster Heater C2603 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2603-1   Ground
      C2603-3   Ground
      C2603-5   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to AL3

AL3 CHECK THE ELECTRIC BOOSTER HEATER CIRCUITS FOR AN OPEN
  • Ignition OFF.
  • Disconnect BJB C1035A .
  • Disconnect BJB C1035B .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2603-1   C1035A-46

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2603-3   C1035B-49
      C2603-5   C1035B-50

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2603-2   Ground
      C2603-4   Ground

Are the resistances less than 3 ohms?
Yes GO to AL4
No REPAIR the circuit.

AL4 CHECK THE ELECTRIC BOOSTER HEATER CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C2603-1   Ground
      C2603-3   Ground
      C2603-5   Ground

Are the resistances greater than 10,000 ohms?
Yes VERIFY BJB fuses 83 (40A), 84 (60A), 85 (40A) are OK. If OK, INSTALL a new BJB . TEST the system for normal operation. If the concern is still present, GO to AL5
If not OK, REPAIR the circuit.
No REPAIR the circuit.

AL5 CHECK FOR CORRECT ELECTRIC BOOSTER HEATER OPERATION

NOTE: Make sure operating conditions for the operation of the electric booster heater are met.

  • Disconnect and inspect all electric booster heater electrical connectors.
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all electric booster heater electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new electric booster heater.
REFER to: Electric Booster Heater (412-03 Supplemental Climate Control, Removal and Installation).
CLEAR all Diagnostic Trouble Codes (DTCs) and CARRY OUT the HVAC control module self-test. TEST the system for normal operation. If the concern is still present, GO to AL6
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

AL6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly. WAIT 20 seconds for the range calibration to be executed after reconnecting of the module before any further assessment or measurement is made. If the actuator range calibration does not start, or has been interrupted, carry out the HVAC Calibration Routine, using a diagnostic scan tool.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST AM: INSUFFICIENT AIR CONDITIONING (A/C) COOLING

Possible Sources

  • Improper A/C system refrigerant charge
  • Temperature door actuator
AM1 CHECK THE AIR CONDITIONING (A/C) SYSTEM FOR PROPER CHARGE

NOTE: Proper Air Conditioning (A/C) system diagnosis on a vehicle's compressor is dependent on correct refrigerant system charge and tested in ambient temperatures above 21.1°C (70°F).

  • Carry out the refrigerant system tests.
    REFER to: Refrigerant System Tests - 1.5L EcoBoost (132kW/180PS) – I3 (Y1) (412-00 Climate Control System - General Information, General Procedures).
    REFER to: Refrigerant System Tests - 2.0L EcoBoost (177kW/240PS) – MI4 (412-00 Climate Control System - General Information, General Procedures).
    REFER to: Refrigerant System Tests - 2.5L Duratec – Hybrid (121kW/164PS) (BG) (412-00 Climate Control System - General Information, General Procedures).

Did the system pass the refrigerant system tests?
Yes DIAGNOSE for a temperature door actuator not operating correctly. GO to Pinpoint Test G GO to Pinpoint Test H
No REPAIR the concern found in the refrigerant system tests chart.

PINPOINT TEST AN: REDUCED OUTLET AIRFLOW

Possible Sources

  • Plugged cabin air filter
  • Improper A/C system refrigerant charge
  • Blower motor

NOTE: Before carrying out the following test, diagnose all Heating, Ventilation And Air Conditioning (HVAC) control module and Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs).

AN1 CHECK THE CABIN AIR FILTER
  • Ignition OFF.
  • Inspect the cabin air filter for possibly plugged or wet.
    REFER to: Cabin Air Filter (412-00 Climate Control System - General Information, Removal and Installation).

Is the cabin air filter plugged?
Yes REPLACE or REPAIR as needed.
No GO to AN2

AN2 CHECK THE BLOWER MOTOR OPERATION
  • Ignition ON.
  • Using the HVAC controls, select panel mode, set temperature to mid range.
  • Operate the blower motor through all speeds.
  • Turn off the blower motor.

Does the blower motor operate properly?
Yes GO to AN3
No DIAGNOSE the blower motor concern. GO to Pinpoint Test O

AN3 CHECK THE AIR CONDITIONING (A/C) SYSTEM FOR PROPER CHARGE

NOTE: Proper Air Conditioning (A/C) system diagnosis on a vehicle's compressor is dependent on correct refrigerant system charge and tested in ambient temperatures above 21.1°C (70°F).

  • Carry out the refrigerant system tests.
    REFER to: Refrigerant System Tests - 1.5L EcoBoost (132kW/180PS) – I3 (Y1) (412-00 Climate Control System - General Information, General Procedures).
    REFER to: Refrigerant System Tests - 2.0L EcoBoost (177kW/240PS) – MI4 (412-00 Climate Control System - General Information, General Procedures).
    REFER to: Refrigerant System Tests - 2.5L Duratec – Hybrid (121kW/164PS) (BG) (412-00 Climate Control System - General Information, General Procedures).

Did the system pass the refrigerant system tests?
Yes The system is operating correctly at this time.
No CHECK the A/C system for leaks. GO to Pinpoint Test AU
After leak is repaired, RECHARGE the A/C system.
REFER to: Air Conditioning (A/C) System Recovery, Evacuation and Charging (412-00 Climate Control System - General Information, General Procedures).
REFER to: Air Conditioning (A/C) System Recovery, Evacuation and Charging - 2.5L Duratec – Hybrid (121kW/164PS) (BG) (412-00 Climate Control System - General Information, General Procedures).

PINPOINT TEST AO: AIR CONDITIONING (A/C) SYSTEM NOISE, VIBRATION AND HARSHNESS (NVH)

NOTE: Proper Air Conditioning (A/C) system diagnosis on a vehicle's compressor is dependent on correct refrigerant system charge and tested in ambient temperatures above 21.1°C (70°F).

Normal Operation and Fault Conditions

INSPECT the A/C system for a leak. GO to Pinpoint Test AU

Some sounds are normal when the A/C system is operating. When the refrigerant charge is found to be correct, compare to a like vehicle.

Possible Sources

  • Low refrigerant charge
  • A/C compressor clutch air gap out of specification
  • A/C compressor pulley bearing worn
  • A/C compressor bearing worn
  • A/C lines or hoses in contact with frame or other components
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST AP: P01EB:96, P2DA4:00, P2DA5:00, P2DA7:00, U069E:81, U069E:87

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Cabin coolant heater, REFER to: Supplemental Climate Control - System Operation and Component Description (412-03 Supplemental Climate Control, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
SOBDMC P01EB:96 Engine Coolant Heater 'A' Control Circuit Performance: Component Internal Failure This fault is due to an issue with the cabin coolant heater or its cooling loop. Check for low coolant levels, blocked valves, kinked hoses, miss-routed hoses, malfunctioning coolant pumps. If heater is working, and system is providing heat to cabin, check temperature sensors. Verify High Voltage connection to heater is connected and no issues with cable.
SOBDMC P2DA4:00 Coolant Heater 'A' Internal Control Module Performance: No Sub Type Information Test fails in the following conditions: cabin coolant heater reports an internal electrical short, cabin coolant heater reports a temperature sensor fault, cabin coolant heater reports a current sensor fault. Cabin coolant heater disabled.
SOBDMC P2DA5:00 Coolant Heater 'A' Supply Voltage Circuit: No Sub Type Information Test fails when cabin coolant heater reports a power supply fault. This is a fault reported by the cabin coolant heater and points to a fault within the cabin coolant heater itself. Cabin coolant heater disabled.
SOBDMC P2DA7:00 Coolant Heater 'A' Control Module System Voltage: No Sub Type Information Test fails when cabin coolant heater reports a HV voltage out of range fault. Cabin coolant heater disabled.
SOBDMC U069E:81 Lost Communication with Coolant Heater 'B': Invalid Serial Data Received Cabin coolant heater communicates over a LIN bus circuit. This is likely caused by an intermittent LIN fault.
SOBDMC U069E:87 Lost Communication with Coolant Heater 'B': Missing Message Cabin coolant heater communicates over a LIN bus circuit. If other LIN modules are missing communication, LIN wiring may be faulty. If this is the only LIN module missing, the heater or its leg of the LIN bus could be faulty.

Possible Sources

  • Fuse
  • Wiring, terminals or connectors
  • Cabin coolant heater

Visual Inspection and Pre-checks

  • Verify BJB fuse 97 (10A) is OK.

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTE: Before carrying out this pinpoint test, ensure the high voltage battery is at least 50 % charged. For charging information, refer to section 414-03.

AP1 CHECK THE CABIN COOLANT HEATER USING THE PARAMETER IDENTIFICATION (PID)

NOTICE: Running of the cabin coolant heater without running the cabin heater coolant pump may cause damage to the cabin coolant heater.

NOTE: Before an active command of the Cabin Heater Coolant Pump, the Cabin Coolant Heater or the Cabin Heater Coolant Diverter Valve can be performed, the vehicle must be in Ready to Drive mode. Switch the ignition on with transmission selector lever in position P. Look for the green ready indicator light to appear in the lower right portion of the instrument cluster and a ready to drive message to appear in the middle of the left cluster screen.

  • Place vehicle in Ready to Drive mode.
  • Press the EV button (center console) & select EV Now.
  • Set the HVAC controls to Auto and set the temperature to 80°F.
  • Access the  SOBDMC  and control the  HTRCABIN_PWM (%)  PID

  • Touch the heater core hoses.

Do the heater core hoses increase in temperature?
Yes GO to AP10
No GO to AP2

AP2 CHECK THE ACCM (AIR CONDITIONING CONTROL MODULE) HIGH VOLTAGE SUPPLY PID (PARAMETER IDENTIFICATION)

NOTE: The Cabin Coolant Heater and the Air Conditioning Control Module share the same High Voltage source. Monitor the ACCM HV PID.

  • With the vehicle in Ready to Drive mode,

    Access the  ACCM  and monitor the  ACCM_CHVS (V)  PID


Is the voltage supply PID between 100 volts and 467 volts?
Yes GO to AP6
No GO to AP3

AP3 CHECK FOR PARTIALLY MATED HIGH VOLTAGE CONNECTORS
  • Ignition OFF.
  • Depower the High Voltage Battery system.
  • Inspect the high voltage (14B323) ACCM C1803B, C1222 and Cabin coolant heater C1815A (14B322) for partially mated connections.

Are any of the connectors not fully seated?
Yes RECONNECT the disconnected connectors. Make sure they seat and latch correctly. TEST the system for normal operation. If the concern is still present, GO to AP4
No GO to AP4

AP4 CHECK THE CABIN COOLANT HEATER HIGH VOLTAGE CABLES FOR AN OPEN

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

  • Ignition OFF.
  • Depower the High Voltage Battery system.
  • Disconnect High Voltage Battery Junction Box C4236D .
  • Disconnect ACCM C1803B .
  • Disconnect Cabin coolant heater C1815A .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1803B-B   C1815A-1
      C1803B-A   C1815A-4

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C4236D-4   C1815A-3
      C4236D-2   C1815A-2

Are the resistances less than 3 ohms?
Yes GO to AP5
No INSTALL new (14B322) or (14B323) high voltage cables as needed.

AP5 CHECK THE HIGH VOLTAGE LOW CURRENT FUSE

  WARNING: Never install the service disconnect plug when a high-voltage service cover is removed. Always install the cover prior to connecting the service disconnect plug. The cover prevents inadvertent contact with the high voltage which is present at several points under the cover. Failure to follow these instructions may result in serious personal injury or death.

  • Measure the resistance of the high voltage low current fuse.

Is the resistance less than 3 ohms?
Yes GO to AP12
No INSTALL a new (50A) high voltage low current fuse.

AP6 CHECK THE CABIN COOLANT HEATER LOW VOLTAGE CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect BJB fuse 97 (10A).
  • Disconnect Cabin coolant heater C1815B .
  • Disconnect ACCM C1803A .
  • Disconnect SOBDMC C199A .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1815B-3   Ground
      C1815B-2   Ground

Is there any voltage present?
Yes REPAIR the circuit in question.
No GO to AP7

AP7 CHECK THE CABIN COOLANT HEATER LOW VOLTAGE CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1815B-3   Ground
      C1815B-2   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to AP8
No REPAIR the circuit in question.

AP8 CHECK THE CABIN COOLANT HEATER LOW VOLTAGE CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1815B-3 BJB fuse 97 (10A) cavity, component side

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1815B-2   C199A-31

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1815B-1   Ground

Are the resistances less than 3 ohms?
Yes GO to AP9
No REPAIR the circuit in question.

AP9 CHECK THE CABIN COOLANT HEATER LOW VOLTAGE CIRCUITS FOR A SHORT TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1815B-1   C1815B-2
      C1815B-1   C1815B-3
      C1815B-2   C1815B-3

Are the resistances greater than 10,000 ohms?
Yes GO to AP10
No REPAIR the circuits in question.

AP10 CHECK THE COOLANT HOSE ROUTING

NOTE: Routing of the coolant hoses is critical to proper Cabin Coolant Heater System operation.

  • Ignition OFF.
  • Check the cabin coolant heater system hose routing. Pay close attention to the diverter valve hose routing and the top and bottom ports of the bulkhead. View the system diagrams,
    REFER to: Supplemental Climate Control - System Operation and Component Description (412-03 Supplemental Climate Control, Description and Operation).

Are the coolant hoses routed correctly?
Yes GO to AP11
No CORRECT the coolant hose routing.
REFER to: Supplemental Climate Control - System Operation and Component Description (412-03 Supplemental Climate Control, Description and Operation).

AP11 CHECK THE ENGINE COOLANT LEVEL

NOTE: Allow the engine to cool before checking the engine coolant level.

  • Visually inspect the engine coolant level at the degas bottle.

Is the engine coolant level within specifications?
Yes GO to AP12
No Refer to the appropriate procedure in Group 303-03.

AP12 CLEAR ALL SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C) DIAGNOSTIC TROUBLE CODES

NOTE: Before an active command of the Cabin Heater Coolant Pump, the Cabin Coolant Heater or the Cabin Heater Coolant Diverter Valve can be performed, the vehicle must be in Ready to Drive mode. Switch the ignition on with transmission selector lever in position P. Look for the green ready indicator light to appear in the lower right portion of the instrument cluster and a ready to drive message to appear in the middle of the left cluster screen.

  • Reconnect all disconnected connectors. Make sure they seat and latch correctly.
  • Place vehicle in Ready to Drive mode.
  • Press the EV button (center console) & select EV Now.
  • Set the HVAC controls to Auto and set the temperature to 80°F.
  • Using a diagnostic scan tool, CLEAR all SOBDMC Diagnostic Trouble Codes (DTCs) and CARRY OUT the SOBDMC self-test.
  • Access the  SOBDMC  and control the  HTRCABIN_PWM (%)  PID

  • Touch the heater core hoses.

Do the heater core hoses increase in temperature?
Yes If the cabin coolant heater operates normally, the system is operating correctly at this time. The concern may have been caused by cabin coolant heater connections. ADDRESS the root cause of any connector or pin issues.
No INSTALL a new cabin coolant heater.
REFER to: Cabin Coolant Heater (412-03 Supplemental Climate Control, Removal and Installation).
RE-CHECK the cabin coolant heater system hose routing. Pay close attention to the hose routing to the diverter valve. View the system diagrams, REFER to: Supplemental Climate Control - System Operation and Component Description (412-03 Supplemental Climate Control, Description and Operation).
TEST the system for normal operation. (To test the cabin coolant heater system for normal operation, place the vehicle in Ready to Drive mode, make sure EV Now is selected and the Heating, Ventilation, and Air Conditioning (HVAC) control is set to Auto and the cabin temperature is set to 80°F. Run the system for 5 minutes and feel the air temperature at the air discharge registers or vents.)

PINPOINT TEST AQ: P2183, P2184, P2185, P2186

Refer to Wiring Diagrams Cell 23 for schematic and connector information.

Normal Operation and Fault Conditions

Cabin heater coolant temperature sensor (also known as ECT sensor 2), REFER to: Supplemental Climate Control - System Operation and Component Description (412-03 Supplemental Climate Control, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P2183:00 Engine Coolant Temperature Sensor 2 Circuit Range/Performance: No Sub Type Information This DTC sets when the PCM senses voltage out of range on the ECT sensor 2 circuit.
PCM P2184:00 Engine Coolant Temperature Sensor 2 Circuit Low: No Sub Type Information This DTC sets when the PCM senses low voltage on the ECT sensor 2 circuit, indicating a short to ground.
PCM P2185:00 Engine Coolant Temperature Sensor 2 Circuit High: No Sub Type Information This DTC sets when the PCM senses high voltage on the ECT sensor 2 circuit, indicating a short to voltage.
PCM P2186:00 Engine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic: No Sub Type Information This DTC sets when the PCM senses erratic voltage on the ECT sensor 2 circuit, indicating an intermittent connection or a short to ground or voltage.

Possible Sources

  • Wiring, terminals or connectors
  • Cabin heater coolant temperature sensor (also known as ECT sensor 2)
  • PCM

  WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Before performing this pinpoint test, ensure the high voltage battery is at least 50 % charged. For charging information, refer to section 414-03.

AQ1 CHECK THE COOLANT HOSE ROUTING

NOTE: Routing of the coolant hoses is critical to proper Cabin Coolant Heater System operation.

  • Ignition OFF.
  • Check the cabin coolant heater system hose routing. Refer to Plug-In Hybrid Electric Vehicle (PHEV) component location view,
    REFER to: Supplemental Climate Control - Component Location (412-03 Supplemental Climate Control, Description and Operation).

Are the coolant hoses routed correctly?
Yes CLEAR all Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules. TEST system for normal operation. ( To test the cabin coolant heater system for normal operation, place the vehicle in Ready to Drive mode, make sure the Heating, Ventilation, and Air Conditioning (HVAC) control is set to Auto and the cabin temperature is set to 80°F. Run the system for 5 minutes and feel the air temperature at the air discharge registers or vents.) If the concern is still present, GO to AQ2
No CORRECT the coolant hose routing. Refer to the appropriate Description and Operation procedure in Group 412-03.

AQ2 CHECK THE CABIN HEATER COOLANT TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect PCM C1381B .
  • Disconnect Cabin heater coolant temperature sensor C1016 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1016-1   Ground
      C1016-2   Ground

Is there any voltage present?
Yes REPAIR the circuit in question.
No GO to AQ3

AQ3 CHECK THE CABIN HEATER COOLANT TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1016-1   Ground
      C1016-2   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to AQ4
No REPAIR the circuit in question.

AQ4 CHECK THE CABIN HEATER COOLANT TEMPERATURE SENSOR CIRCUITS FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1016-1   C1381B-17
      C1016-2   C1381B-13

Are the resistances less than 3 ohms?
Yes GO to AQ5
No REPAIR the circuit in question.

AQ5 CHECK THE CABIN HEATER COOLANT TEMPERATURE SENSOR CIRCUITS FOR A SHORT TOGETHER
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1016-1   C1016-2

Is the resistance greater than 10,000 ohms?
Yes GO to AQ6
No REPAIR the circuits.

AQ6 CHECK THE CABIN HEATER COOLANT TEMPERATURE SENSOR RESISTANCE
  • Measure:
    Positive Lead Measurement / Action Negative Lead
    C1016 pin 1, component side C1016 pin 2, component side
  • Compare the cabin heater coolant temperature sensor measured resistance with the table below.
    Temperature Resistance (K ohms)
    130°C (266°F) 0.86 - 0.97
    120°C (248°F) 1.13 - 1.25
    110°C (230°F) 1.48 - 1.64
    100°C (212°F) 1.97 - 2.18
    90°C (194°F) 2.66 - 2.95
    80°C (176°F) 3.64 - 4.03
    70°C (158°F) 5.07 - 5.60
    60°C (140°F) 7.17 - 7.93
    50°C (122°F) 10.37 - 11.47
    40°C (104°F) 15.30 - 16.92
    30°C (86°F) 23.04 - 25.47
    20°C (68°F) 35.47 - 39.21
    10°C (50°F) 56.03 - 61.94
    0°C (32°F) 91.05 - 100.64
    -10°C (14°F) 152.29 - 168.33

Is the resistance within the specified values for the temperatures?
Yes GO to AQ7
No INSTALL a new Cabin Heater Coolant Temperature Sensor.
REFER to: Cabin Heater Coolant Temperature Sensor (412-03 Supplemental Climate Control, Removal and Installation).
CLEAR all PCM Diagnostic Trouble Codes (DTCs) and CARRY OUT the PCM self-test. TEST the system for normal operation. (To test the cabin coolant heater system for normal operation, place the vehicle in Ready to Drive mode, make sure the Heating, Ventilation, and Air Conditioning (HVAC) control is set to Auto and the cabin temperature is set to 80°F. Run the system for 5 minutes and feel the air temperature at the air discharge registers or vents.) If the concern is still present, GO to AQ7

AQ7 CHECK FOR CORRECT POWERTRAIN CONTROL MODULE (PCM) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the PCM connectors.
  • Repair:
    • corrosion (replace connector or terminals – clean module pins)
    • damaged or bent pins – replace terminals/pins
    • pushed-out pins – replace pins as necessary
  • Reconnect the PCM connectors. Make sure they seat and latch correctly.
  • Operate the system and verify the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,
   VIN required to access Guided Routine (PCM)
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST AR: P26BD:00, P26BE:00, P26BF:00, P26C1:00

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Cabin heater coolant diverter valve, REFER to: Supplemental Climate Control - System Operation and Component Description (412-03 Supplemental Climate Control, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P26BD:00 Engine Coolant Bypass Valve 'D' Control Circuit/Open: No Sub Type Information Test fails when PCM reports an open circuit on the cabin heater coolant diverter valve control circuit
PCM P26BE:00 Engine Coolant Bypass Valve 'D' Control Circuit Low: No Sub Type Information Test fails when PCM reports a short to ground on the cabin heater coolant diverter valve control circuit
PCM P26BF:00 Engine Coolant Bypass Valve 'D' Control Circuit High: No Sub Type Information Test fails when PCM reports a short to power on the cabin heater coolant diverter valve control circuit
PCM P26C1:00 Engine Coolant Bypass Valve 'D' Range/Performance: No Sub Type Information The PCM sets this DTC when the cabin heater coolant diverter valve is stuck closed in the Isolated loop when the PCM commands it to be in combined loop

Possible Sources

  • Wiring, terminals or connectors
  • Cabin heater coolant diverter valve
  • PCM
  • Kinked or pinched hoses

Visual Inspection and Pre-checks

  • Verify BJB fuse 8 (15A) is OK.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Before performing this pinpoint test, ensure the high voltage battery is at least 50 % charged and the 12 volt battery state of charge must be above 61%.

AR1 CHECK THE CABIN HEATER COOLANT DIVERTER VALVE OPERATION
  • Place vehicle in Ready to Drive mode.
  • Set the HVAC controls to MAX defrost.
  • Access the

    Access the  PCM  and monitor the  EC_BYPASS_D  PID

  • Observe the PID when turning the MAX defrost on and off.

Does the PID read True when Max defrost is on and False when Max defrost is off?
Yes GO to AR2
No GO to AR3

AR2 CHECK THE CABIN HEATER COOLANT DIVERTER VALVE COOLANT HOSES

NOTE: The coolant hoses are critical to proper Cabin Coolant Heater System operation.

  • Ignition OFF.
  • Check the cabin coolant heater system hoses routing for pinched or kinked hoses. Refer to Plug-In Hybrid Electric Vehicle (PHEV) component location view,
    REFER to: Supplemental Climate Control - Component Location (412-03 Supplemental Climate Control, Description and Operation).

Are there any pinched or kinked hoses?
Yes Fix or repair any pinched or kinked hoses. TEST system for normal operation.
No GO to AR3

AR3 CHECK THE CABIN HEATER COOLANT DIVERTER VALVE SUPPLY CIRCUIT FOR VOLTAGE
  • Disconnect Cabin Heater Coolant Diverter Valve C1918 .
  • Place vehicle in Ready to Drive mode.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1918-4   Ground

Is the voltage greater than 11 Volts?
Yes GO to AR4
No VERIFY BJB fuse 8 (15A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

AR4 CHECK THE CABIN HEATER COOLANT DIVERTER VALVE GROUND CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1918-4   C1918-1

Is the voltage greater than 11 Volts?
Yes GO to AR5
No REPAIR the ground circuit.

AR5 CHECK THE CABIN HEATER COOLANT DIVERTER VALVE CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
  • Disconnect BJB fuse 8 (15A).
  • Disconnect PCM C1381B .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1918-3   C1918-1

Is any voltage present?
Yes REPAIR the circuit.
No GO to AR6

AR6 CHECK THE CABIN HEATER COOLANT DIVERTER VALVE CONTROL CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1918-3   C1918-1

Is the resistance greater than 10,000 ohms?
Yes GO to AR7
No REPAIR the circuit.

AR7 CHECK THE CABIN HEATER COOLANT DIVERTER VALVE CONTROL CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1918-3   C1381B-96

Is the resistance less than 3 ohms?
Yes INSTALL a new cabin heater coolant diverter valve.
REFER to: Cabin Heater Coolant Diverter Valve (412-03 Supplemental Climate Control, Removal and Installation).
CLEAR codes and CARRY OUT the PCM self-test. TEST the system for normal operation. If the concern is still present, GO to AR8
No REPAIR the affected circuits.

AR8 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all PCM electrical connectors (if not previously disconnected).
  • Repair:
    • corrosion (install new connector or terminal - clean module pins)
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
  • Connect all PCM electrical connectors. Make sure they seat and latch correctly.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,
   VIN required to access Guided Routine (PCM)
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST AS: P2DA6:00

Normal Operation and Fault Conditions

For information on the Cabin Coolant Heater System, Cabin Heater Coolant Diverter Valve, Cabin Heater Coolant Pump, Isolated and Combined Loops, REFER to: Supplemental Climate Control - System Operation and Component Description (412-03 Supplemental Climate Control, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
SOBDMC P2DA6:00 Coolant Heater 'A' Over Temperature: No Sub Type Information Test fails when cabin coolant heater reports an over temperature fault. This fault can be caused either due to no coolant flow across the heater (kinked hoses / pump fault / aeration / no coolant / stuck valve) or failure of the heater itself.

Possible Sources

  • Low coolant level
  • Aeration of the coolant
  • Kinked hoses
  • Pump fault
  • Stuck cabin heater coolant diverter valve
  • Cabin coolant heater

NOTE: Before performing this pinpoint test, ensure the high voltage battery is at least 50 % charged and the 12 volt battery state of charge must be above 61%.

AS1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C)
  • Ignition ON. Ready to drive mode.
  • Using the FDRS diagnostic scan tool, carry out the self-test for the SOBDMC .

Are Diagnostic Trouble Codes (DTCs) P2DA4:00, P2DA5:00, P2DA6:00, P2DA7:00, U069E:81 or U069E:87 present ?
Yes For P2DA4:00, P2DA5:00, P2DA7:00, U069E:81 or U069E:87, GO to Pinpoint Test AP
For P2DA6:00, GO to AS2
No For all other Diagnostic Trouble Codes (DTCs), REFER to the Master DTC Chart.

AS2 CHECK THE COOLANT LEVEL

NOTE: Allow the electrified drivetrain to cool before checking the coolant level.

  • Make sure that the vehicle is on a level surface.
  • Make sure that the steering wheel is set to the straight ahead position.
  • Ignition OFF.
  • Visually inspect the coolant level in the coolant expansion tank.

Is the level of coolant below the minimum fill line or has the vehicle been recently serviced for coolant system repair?
Yes If the coolant is below the minimum fill line, add coolant and using the FDRS scan tool run the fill and bleed procedure, located in the BECM . If the vehicle was recently serviced for a coolant system repair and the coolant level is correct, use the FDRS scan tool to run the fill and bleed procedure for the electric drivetrain cooling system.
REFER to: Cooling System Filling and Bleeding (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), General Procedures).
No GO to AS3

AS3 CHECK FOR CABIN HEATER COOLANT PUMP, COOLANT PUMP FOR HIGH VOLTAGE BATTERY AND DIVERTER VALVE DIAGNOSTIC TROUBLE CODES (DTCS)
  • Make sure the vehicle is not plugged into the charger.
  • Ignition ON. Ready to drive mode.
  • To allow consistent FDRS scan tool operation, set the vehicle power down timer to off. This is a setting in the display unit under settings.
  • For the high voltage battery coolant diverter valve,

    Access the  SOBDMC  and control the  HYTRACB_THRM_OP  PID

    and active command the parameter to Battery Heating – Request Coolant Flow Through PTC (Positive Temperature Coefficient) Heater
  • For the high voltage battery coolant pump,

    Access the  BECM  and control the  COOL_PMP_A_CMD (%)  PID

  • For the cabin heater coolant pump,

    Access the  PCM  and control the  COOLANT_PMP_A  PID

  • Run the coolant pumps for a minimum of 5 minutes.
  • Turn off both coolant pumps.
  • Using the FDRS scan tool, carry out the BECM , PCM and SOBDMC self-tests.

Are any coolant pump or diverter valve Diagnostic Trouble Codes (DTCs) present?
Yes DIAGNOSE all received Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart.
No GO to AS4

AS4 CHECK THE CABIN HEATER COOLANT TEMPERATURE SENSOR VALUE
  • Access the  PCM  and monitor the  ECT2 (Deg C)  PID


Is the ECT 2 sensor PID value less than 70°C (158°F)?
Yes GO to AS5
No Turn ignition OFF and let the vehicle soak for a minimum of 15 minutes. After it cools down, REPEAT test step AS4.

AS5 CHECK THE VEHICLE COOLANT SYSTEM WITH THE HIGH VOLTAGE BATTERY COOLANT PUMP COMMANDED OFF

NOTE: To carry out this test, make sure the coolant diverter valve for the high voltage battery and the coolant pump for the high voltage battery are in the correct state.

  • For the high voltage battery coolant diverter valve,

    Access the  SOBDMC  and control the  HYTRACB_THRM_OP  PID

    and active command the PID to Thermal System is Off (No Coolant Circulation).
  • For the high voltage battery coolant pump,

    Access the  BECM  and control the  COOL_PMP_A_CMD (%)  PID

    and active command the PID to OFF (0 %)
  • For the cabin heater coolant diverter valve,

    Access the  PCM  and control the  EC_BYPASS_D  PID

    and active command the PID to False (isolated mode).
  • For the cabin heater coolant pump,

    Access the  PCM  and control the  COOLANT_PMP_A  PID

    and active command the PID to True (on).
  • Access the  PCM  and monitor the  COOLPMP_A_STAT  PID

    and monitor the PID and Observe the Cabin Heater Coolant Pump is commanded on and no fault detected.

Does the status Coolpmp_A _stat PID state no fault detected?
Yes GO to AS6
No GO to Pinpoint Test D

AS6 CHECK PARAMETER IDENTIFICATIONS (PIDS) FOR INTERNAL FAILURE OF CABIN COOLANT HEATER
  • Ignition ON. Ready to drive mode.
  • Set the HVAC controls in MAX defrost mode. Run MAX defrost for 30 seconds.
  • Using the FDRS scan tool, monitor the PIDs for the Cabin Coolant Heater.
  • Access the  SOBDMC  and monitor the  COOLHTR_A_OP  PID

  • Access the  SOBDMC  and monitor the  PTC_AMP_F  PID


Do the PIDS say Fault, except for the over temperature?
Yes INSTALL a new Cabin Coolant Heater.
REFER to: Cabin Coolant Heater (412-03 Supplemental Climate Control, Removal and Installation).
No GO to AS7

AS7 CHECK THE CABIN COOLANT HEATER COOLANT LOOP OPERATION (IN ISOLATION LOOP MODE)
  • Set the HVAC controls in MAX defrost mode. Run MAX defrost.
  • For the Cabin Coolant Heater,

    Access the  SOBDMC  and control the  HTRCABIN_PWM (%)  PID

    and command the PID to 100%.
  • Run the Cabin Coolant Heater for 1 minute and monitor the coolant temperature PIDs.
  • For the Cabin Heater Coolant Temperature Sensor,

    Access the  PCM  and monitor the  ECT2_SUP  PID

    ,

    Access the  PCM  and monitor the  ECT2 (Deg C)  PID

    and record Cabin Heater Coolant Temperature sensor ECT2 value.
  • For the Battery Coolant Inlet Temperature,

    Access the  BECM  and monitor the  BAT_COOL_INLETTEMP (Deg C)  PID

    and record the battery coolant inlet temperature PID value.

Does the ECT2 read less than 90°C (194°F)?
Yes GO to AS8
No If the battery coolant temperature rises greater than 4 to 6°C (39 to 42°F), there is a stuck valve. INSTALL a new Cabin Heater Coolant Diverter Valve.
REFER to: Cabin Heater Coolant Diverter Valve (412-03 Supplemental Climate Control, Removal and Installation). If the battery coolant temperature does not rise greater than 4 to 6°C (39 to 42°F), there is a blockage or pinched hose. REPAIR kinked hoses. If no blocked or pinched hoses are detected, DIAGNOSE for the cabin heater coolant pump causing a possible restriction of flow. GO to Pinpoint Test D

AS8 VERIFY THE BATTERY COOLANT LOOP OPERATION (IN COMBINED LOOP MODE)
  • Ignition ON. Ready to drive mode.
  • Set the HVAC controls to off.
  • Plug the vehicle into the charger.
  • For the Battery Coolant Inlet Temperature,

    Access the  BECM  and monitor the  BAT_COOL_INLETTEMP (Deg C)  PID

    and record the battery coolant inlet temperature PID value.
  • Make sure the temperature is less than 45°C (113 degrees F). If not, turn the vehicle off and allow the vehicle to soak for one hour to cool.
  • Access the  SOBDMC  and control the  HYTRACB_THRM_OP  PID

    and command this PID to Battery heating - Request Coolant Flow through PTC Heater (Cabin Coolant Heater)
  • Run the pump for 3 minutes.
  • For the Cabin Heater Coolant Temperature Sensor,

    Access the  PCM  and monitor the  ECT2_SUP  PID

    and record Cabin Heater Coolant Temperature sensor ECT2 value.

Are the temperatures for the Cabin heater coolant temperature sensor ECT2 and the High Voltage Battery coolant temperature within 10°C or 18°F of each other?
Yes CLEAR Diagnostic Trouble Codes (DTCs). CARRY OUT the self-test for the SOBDMC . If P2DA6:00 is still present, INSTALL a new Cabin Coolant Heater.
REFER to: Cabin Coolant Heater (412-03 Supplemental Climate Control, Removal and Installation).
No GO to AS9

AS9 CHECK FOR PROPER ROUTING, BENT OR PINCHED COOLANT HOSES

NOTE: Routing of the coolant hoses is critical to proper Cabin Coolant Heater System operation.

  • Ignition OFF.
  • Check the cabin coolant heater system hose routing found in the Removal and Installation procedure of the Cabin Coolant Heater and the Cabin Heater Coolant Diverter Valve.
    REFER to: Cabin Coolant Heater (412-03 Supplemental Climate Control, Removal and Installation).
    REFER to: Cabin Heater Coolant Diverter Valve (412-03 Supplemental Climate Control, Removal and Installation).

Is there any improper hose routing, bent or pinched off hoses?
Yes Fix and repair the hose routing, bent, or pinched off hoses as necessary.
No Install a new Cabin Heater Coolant Diverter Valve.
REFER to: Cabin Heater Coolant Diverter Valve (412-03 Supplemental Climate Control, Removal and Installation).

PINPOINT TEST AT: INSUFFICIENT, ERRATIC OR NO HEAT WITH NO DIAGNOSTIC TROUBLE CODES (DTCS) - PLUG-IN HYBRID ELECTRIC VEHICLES

NOTE: In certain conditions, for example, warm weather, the electric heater may not activate or could run slow w hen switched on. This helps reduce power consumption from the battery.

Normal Operation and Fault Conditions

When E-Heat is on, an electric heater is used to warm the cabin and keep the windows from fogging. Turning E-Heat off saves battery power, which extends your driving range. The electric heater is the only source of heat to warm the cabin. For additional information on the climate control features found on the Information and Entertainment Display Unit, Refer to the Owner's Literature.

Possible Sources

  • Low coolant level
  • Aeration of the coolant
  • Plugged or partially plugged heater core
  • Temperature door binding or stuck
  • Temperature door actuator

Visual Inspection and Pre-checks

  • Inspect for low coolant level.
AT1 CHECK FOR CORRECT COOLANT LEVEL
  • Ignition OFF.
  • Visually inspect the coolant level in the coolant expansion tank.

Is the coolant level above the minimum line on the coolant expansion tank?
Yes GO to AT2
No GO to AT3

AT2 RESET THE OUTSIDE AIR TEMPERATURE (OAT)/AMBIENT AIR TEMPERATURE (AAT) SENSOR
  • Ignition OFF.
  • Wait 1 Minute.
  • Ignition ON. Ready to drive mode.
  • Using the FDRS diagnostic scan tool, follow the on screen prompts to reset the Outside Air Temperature (OAT)/Ambient Air Temperature (AAT) sensor data.
    REFER to: Reset the Outside Air Temperature Sensor Learned Values (412-00 Climate Control System - General Information, General Procedures).
  • On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.

Does the heating system turn on and warm the vehicle's cabin?
Yes The Outside Air Temperature (OAT)/Ambient Air Temperature (AAT) sensor needed to be reset for proper heating system operation.
No GO to AT4

AT3 CHECK THE COOLING SYSTEM FOR LEAKS
  • Pressure test the cooling system for leaks.
    REFER to: Engine Cooling (303-03C Engine Cooling, Diagnosis and Testing).

Does the cooling system leak?
Yes REPAIR the coolant leak.
No FILL and BLEED the cooling system.
REFER to: Cooling System Filling and Bleeding (303-03D Electric Powertrain Cooling - Hybrid Electric Vehicle (HEV), General Procedures). After filling and bleeding the cooling system, GO to AT4

AT4 CHECK FOR COOLANT FLOW TO THE HEATER CORE
  • Ignition ON. Ready to drive mode.
  • Access the  PCM  and monitor the  ECT2_SUP  PID

    and record Cabin Heater Coolant Temperature sensor ECT2 value.
  • Access the  SOBDMC  and control the  HTRCABIN_PWM (%)  PID

    and command the PID to 100% for 2 minutes.
  • On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.
  • Using a suitable temperature measuring device, check the temperature of the heater core inlet hose.

Did the ECT2 temperature value increase 26°C or 50°F?
Yes GO to AT5
No GO to Pinpoint Test AS

AT5 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE
  • Using a suitable temperature measuring device, measure the temperature of the heater core outlet hose.

Is the heater core outlet hose temperature similar to the inlet hose temperature, within approximately 6-17°C (10-30°F)?
Yes DIAGNOSE an inoperative temperature door actuator, GO to Pinpoint Test G GO to Pinpoint Test H
No INSTALL a new heater core.
REFER to: Heater Core (412-00 Climate Control System - General Information, Removal and Installation).

PINPOINT TEST AU: REFRIGERANT LEAK DETECTION

Possible Sources

  • O-ring and Fitting Leaks
  • System Leaks
  • Condenser Leaks
  • Evaporator Leaks
  • Compressors
  • Air Conditioning (A/C) Line Leaks
AU1 CHECK FOR LEAKS USING THE FLUORESCENT DYE LEAK DETECTION

NOTE: Proper Air Conditioning (A/C) system diagnosis on a vehicle's compressor is dependent on correct refrigerant system charge and tested in ambient temperatures above 21.1°C (70°F).

  • Carry out the fluorescent dye leak detection.
    REFER to: Fluorescent Dye Leak Detection (412-00 Climate Control System - General Information, General Procedures).

Is the presence of a leak found using the fluorescent dye leak detection?
Yes Repair any leaks found using the appropriate procedure from Group 412 of the Shop Manual. After the leak(s) is repaired, remove any traces of fluorescent dye with a dye cleaner.
REFER to: Climate Control Tools and Equipment (412-00 Climate Control System - General Information, General Procedures).
No GO to AU2

AU2 CHECK THE AIR CONDITIONING (A/C) SYSTEM PRESSURE

NOTE: Static refrigerant pressure, under perfect conditions, should approximately reflect ambient air temperature. Do not rely upon the static refrigerant pressure alone to determine if the system is properly charged. Refer to the current Ford Web Based Technical Training courses for basic HVAC system refrigerant operation.

  • Ignition OFF.
  • Connect a manifold gauge set.
  • With a manifold gauge set connected, check for A/C system pressure.

Is the A/C system pressure between 413-551 kPa (60-80 psi) at 24°C (75.2°F)?
Yes GO to AU3
No GO to AU4

AU3 CHECK FOR LEAKS USING THE ELECTRONIC LEAK DETECTION

NOTE: Proper Air Conditioning (A/C) system diagnosis on a vehicle's compressor is dependent on correct refrigerant system charge and tested in ambient temperatures above 21.1°C (70°F).

  • Carry out the electronic leak detection.
    REFER to: Electronic Leak Detection (412-00 Climate Control System - General Information, General Procedures).
  • Leak test the refrigerant system using the probe by slowly following the path of the refrigerant circuit checking each component and connection. Follow the instructions included with the Electronic Leak Detector for handling and operation techniques.

Is the presence of a leak found using the electronic leak detection?
Yes Repair any leaks found using the appropriate procedure from Group 412 of the Shop Manual. After the leak(s) is repaired, remove any traces of fluorescent dye with a dye cleaner.
REFER to: Climate Control Tools and Equipment (412-00 Climate Control System - General Information, General Procedures).
No GO to AU4

AU4 CHECK FOR LEAKS USING THE EVACUATION AND VACUUM TEST

NOTE: In an Electric or Hybrid vehicle with a battery chiller, it may be necessary to activate the battery chiller(s) to open the solenoid(s) to allow vacuum and gas to pass through to chiller for leak testing. Refer to vehicle-specific shop manual procedure for refrigerant reclaim and charging to see if solenoid(s) activation is necessary. Follow the shop manual procedure to perform activation if needed.

  • Recover the refrigerant and evacuate the A/C system.
    REFER to: Air Conditioning (A/C) System Recovery, Evacuation and Charging (412-00 Climate Control System - General Information, General Procedures).
    REFER to: Air Conditioning (A/C) System Recovery, Evacuation and Charging - 2.5L Duratec – Hybrid (121kW/164PS) (BG) (412-00 Climate Control System - General Information, General Procedures).
  • Turn off the vacuum pump.
  • Observe the low-pressure gauge for 45 minutes to confirm whether or not a leak exists under vacuum.

Did the low pressure gauge maintain 99.4 kPA (29.5 in-Hg) for 45 minutes?
Yes CHARGE the A/C system and CARRY OUT the Refrigerant System Tests.
REFER to: Refrigerant System Tests - 1.5L EcoBoost (132kW/180PS) – I3 (Y1) (412-00 Climate Control System - General Information, General Procedures).
REFER to: Refrigerant System Tests - 2.0L EcoBoost (177kW/240PS) – MI4 (412-00 Climate Control System - General Information, General Procedures).
REFER to: Refrigerant System Tests - 2.5L Duratec – Hybrid (121kW/164PS) (BG) (412-00 Climate Control System - General Information, General Procedures).
No GO to AU5

AU5 CHECK FOR LEAKS USING THE AIR CONDITIONING (A/C) SYSTEM LEAK TEST USING FORMING GAS
  • Carry out the A/C system leak test using forming gas.
    REFER to: Air Conditioning (A/C) System Leak Test Using Forming Gas (412-00 Climate Control System - General Information, General Procedures).

Was a leak found using the A/C system leak test using forming gas?
Yes Repair any leaks found using the appropriate procedure from Group 412 of the Shop Manual. After the leak(s) is repaired, remove any traces of fluorescent dye with a dye cleaner.
REFER to: Climate Control Tools and Equipment (412-00 Climate Control System - General Information, General Procedures).
No GO to AU6

AU6 CHECK FOR LEAKS IN THE EVAPORATOR CORE
  • Carry out the evaporator core leak check.
    REFER to: Evaporator Core Leak Check (412-00 Climate Control System - General Information, General Procedures).

Did the low pressure gauge maintain 29.In HG for the 30 minutes in the evaporator core?
Yes GO to AU7
No INSTALL a new evaporator core.
REFER to: Evaporator (412-00 Climate Control System - General Information, Removal and Installation).

AU7 CHECK FOR LEAKS IN THE CONDENSER CORE
  • Carry out the condenser core leak check.
    REFER to: Condenser Core Leak Check (412-00 Climate Control System - General Information, General Procedures).

Did the low pressure gauge maintain 29.In HG for the 30 minutes in the condenser core?
Yes REPAIR the concern found in the refrigerant system tests chart.
No INSTALL a new condenser core.
REFER to: Condenser - 1.5L EcoBoost (132kW/180PS) – I3 (Y1) (412-00 Climate Control System - General Information, Removal and Installation).
REFER to: Condenser - 2.0L EcoBoost (177kW/240PS) – MI4 (412-00 Climate Control System - General Information, Removal and Installation).
REFER to: Condenser - 2.5L Duratec – Hybrid (121kW/164PS) (BG) (412-00 Climate Control System - General Information, Removal and Installation).

AU8 CHECK FOR LEAKS IN THE AIR CONDITIONING (A/C) COMPRESSOR
  • Carry out the A/C compressor leak detection.
    REFER to: Air Conditioning (A/C) Compressor Leak Detection (412-00 Climate Control System - General Information, General Procedures).

Was a leak detected in the A/C compressor?
Yes INSTALL a new A/C compressor.
REFER to: Air Conditioning (A/C) Compressor - 1.5L EcoBoost (132kW/180PS) – I3 (Y1) (412-00 Climate Control System - General Information, Removal and Installation).
REFER to: Air Conditioning (A/C) Compressor - 2.0L EcoBoost (177kW/240PS) – MI4 (412-00 Climate Control System - General Information, Removal and Installation).
REFER to: Air Conditioning (A/C) Compressor - 2.5L Duratec – Hybrid (121kW/164PS) (BG) (412-00 Climate Control System - General Information, Removal and Installation).
No Follow the workshop manual for reassembly of the A/C System. CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA .


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