Ford Escape: Automatic Transmission External Controls - Automatic Transmission – HF45 / Diagnosis and Testing - External Controls

Normal Operation and Fault Conditions

The GSM requires an operating voltage between 9 and 16 volts. The GSM receives this voltage from the BCM and has dual ground circuits. Excessive resistance or an open in one or more of these circuits, a discharged battery or a inoperative charging system results in the GSM setting a DTC .

DTC Fault Trigger Conditions

Possible Sources

• Battery or charging system concern
• BCM fuse
• Circuit open or shorted
• Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
• GSM

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC can set if the driver door is not fully closed during the self-test.

• Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM .

• Ignition OFF.

• Ignition ON.

• Wait 10 seconds.

• Using a diagnostic scan tool, carry out the GSM self-test.

• Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from all modules.

• Carry out the Battery Condition Test.
  REFER to: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).
  

• Ignition OFF.

• Disconnect GSM C3532 .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C3532-1		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C3532-18		Ground
  C3532-9		Ground

• Ignition OFF.

• Disconnect and inspect the GSM 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

• Connect the GSM connector. Make sure it seats and latches correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

The GSM requires an operating voltage between 9 and 16 volts. The GSM receives this voltage from the BCM and has dual ground circuits. An inoperative charging system or overcharging condition may result in the GSM setting a DTC . This DTC may also set in the GSM due to battery charging or vehicle jump starting events.

DTC Fault Trigger Conditions

Possible Sources

• Charging system concern
• Battery charging or jump starting event
• GSM

• Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from all modules.

• Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM .

• Turn off all interior lights, exterior lights and accessories.

• NOTE: Do not allow the engine speed to increase above 2,000 RPM while performing this step or the generator may self-excite and result in default charging system output voltage. If engine speed goes above 2,000 RPM , turn the engine off and restart the engine before performing this step. Start and run the engine at approximately 1,500 RPM for 3 minutes while monitoring the battery voltage.

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC can set if the driver door is not fully closed during the self-test.

• Ignition OFF.

• Ignition ON.

• Using a diagnostic scan tool, carry out the GSM self-test.

• Ignition OFF.

• Disconnect and inspect the GSM 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

• Connect the GSM connector. Make sure it seats and latches correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

The GSM uses 2 sensors to monitor the position of the rotary knob. Based on the reading of these 2 sensors, the GSM will illuminate the proper gear indicator LED , and it will communicate the customer selected gear to other modules. The GSM monitors the 2 sensors for the proper frequency, for being within a valid band width, and for matching each other. The GSM monitors each gear indicator LED for circuit integrity, and for proper illumination relative to the selected gear.

DTC Fault Trigger Conditions

Possible Sources

• GSM calibration
• Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
• GSM

• Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from the GSM .

• Verify the GSM calibration is at the latest level.

• Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM .

• Ignition OFF.

• Wait 10 seconds.

• Ignition ON.

• Move the rotary knob to each gear position. Pause in each position for at least 60 seconds.

• Observe the illumination of each gear indicator LED while moving the rotary knob to each position.

• With Drive selected, press the center button to activate sport mode. Observe the illumination of the center button LED .

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC may set if the driver door is not fully closed during the self-test.

• Using a diagnostic scan tool, carry out the GSM self-test.

• Ignition OFF.

• Disconnect and inspect the GSM 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

• Connect the GSM connector. Make sure it seats and latches correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

The brake transmission shift interlock (BTSI) system prevents the shift knob from leaving the park position unless certain conditions are met. To release the brake transmission shift interlock (BTSI), the ignition must be on and the brake pedal must be applied. When the ignition is on, the brake pedal is applied, and the PCM is not commanding the brake transmission shift interlock (BTSI) to be locked, the GSM will release the shift lock.

DTC Fault Trigger Conditions

Possible Sources

• Discharged battery/charging system
• Brake switch
• Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
• GSM

• Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from the GSM .

• Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM .

• Ignition OFF.

• Ignition ON.

• Repeat the following steps 3 times:
  • Press the brake pedal.
  • Select Drive.
  • Select Park.
  • Release the brake pedal.
  • Wait 1 minute.
  • With the brake pedal released, attempt to rotate the rotary knob out of the Park position. The rotary knob should be locked in the Park position with the brake pedal released.

• Access the  PCM  and monitor the  BOO1  PID

• Press and release the brake pedal while observing PID BOO1.

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC may set if the driver door is not fully closed during the self-test.

• Using a diagnostic scan tool, carry out the GSM self-test.

• Ignition OFF.

• Disconnect and inspect the GSM 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

• Connect the GSM connector. Make sure it seats and latches correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

The GSM monitors the status of the driver door using two driver door ajar switches. If the driver door is opened while the vehicle is in drive, the transmission will shift to Park and the GSM indication will automatically correct to Park.

DTC Fault Trigger Conditions

Possible Sources

• Carrying out a GSM self-test with the driver door not fully closed
• Connectors damaged or pushed-out terminals, circuitry open, shorted to power or shorted to ground
• Driver door ajar switch 1
• Driver door ajar switch 2
• GSM

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC can set if the driver door is not fully closed during the self-test.

• Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM .

• Ignition OFF.

• Ignition ON.

• Repeat the following steps 5 times:
  • Open the driver door.
  • Wait 5 seconds.
  • Close the driver door.
  • Wait 5 seconds.

• Make sure the driver door is fully closed.

• Using a diagnostic scan tool, carry out the GSM self-test.

• Ignition ON.

• Open and close the driver door while observing the door ajar icon on the IPC .

NOTE: This vehicle uses a second hardwired door ajar circuit in place of a door unlock circuit. PID DR_UNLCK_HWI is used to monitor the second hardwired door ajar circuit.

• Access the  GSM  and monitor the  DR_AJAR_HWI  PID

• Access the  GSM  and monitor the  DR_UNLCK_HWI  PID

• Open and close the driver door several times while monitoring PID DR_AJAR_HWI and DR_UNLCK_HWI.

• Ignition OFF.

• Disconnect GSM C3532 .

• Disconnect BCM C2280F .

• Disconnect LH Front Door Latch C526A .

• Disconnect LH Front Door Latch C526B .

• Inspect the connectors for damaged or pushed-out terminals.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C3532-15		C526A-4
  C3532-4		C526B-2

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C3532-4		Ground
  C3532-15		Ground

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C3532-4		Ground
  C3532-15		Ground

NOTE: If a GSM self-test is performed, the driver door must be fully closed. A false P166B DTC can set if the driver door is not fully closed during the self-test.

• Ignition OFF.

• Disconnect and inspect the GSM 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

• Connect the GSM connector. Make sure it seats and latches correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

The rotary gear shift knob contains three internal contact switches under the center button. When the button is pressed, the 3 switches send a signal to the GSM . The GSM sets a DTC if the three switch signals do not agree, or if it detects a possible stuck switch.

DTC Fault Trigger Conditions

Possible Sources

• Debris or foreign material on or near the GSM center button
• Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
• GSM
• The customer holding the center button down

• Inspect the GSM center button for debris or foreign materials that could cause it to stick.

• Press and release the GSM center button. Make sure it moves freely.

• Access the  GSM  and monitor the  SBW_SLM_SW_1  PID

• Access the  GSM  and monitor the  SBW_SLM_SW_2  PID

• Access the  GSM  and monitor the  SBW_SLM_SW_3  PID

• Press and release the GSM center button while monitoring the PID s.

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC may set if the driver door is not fully closed during the self-test.

• Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM .

• Ignition OFF.

• Ignition ON.

• Wait 2 minutes.

• Repeat the following steps 20 times:
  • Press and hold the center button for 3 seconds.
  • Release the center button for 3 seconds.

• Using a diagnostic scan tool, carry out the GSM self-test.

• Ignition OFF.

• Disconnect and inspect the GSM 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

• Connect the GSM connector. Make sure it seats and latches correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

The GSM carries out periodic tests on itself. It sets a DTC if any of the results are outside of normal operating standards.

DTC Fault Trigger Conditions

Possible Sources

• Discharged battery/charging system
• GSM calibration
• GSM

• Ignition ON.

• Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from the GSM .

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC can set if the driver door is not fully closed during the self-test.

• Ignition ON.

• Clear all diagnostic trouble codes (DTCs) from the GSM .

• Reprogram the GSM with the latest software.
  REFER to: Module Programming (418-01 Module Configuration, General Procedures).
  

• Using a diagnostic scan tool, carry out the GSM self-test.

Normal Operation and Fault Conditions

In addition to communicating over HS-CAN , the GSM and SOBDMC communicate over a private Transmission CAN . If the GSM does not receive expected messages from the SOBDMC , it will set a DTC .

DTC Fault Trigger Conditions

Possible Sources

• Low system voltage
• Circuit open or shorted
• Incorrect PMI
• Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
• SOBDMC fault

• Using a diagnostic scan tool, review all continuous memory diagnostic trouble codes (CMDTCs) in all modules.

• Using a diagnostic scan tool, carry out the SOBDMC self-test.

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC may set if the driver door is not fully closed during the self-test.

• Using a diagnostic scan tool, carry out the GSM self-test.

NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.

• Check the vehicle service history for recent service actions related to the SOBDMC or to the GSM . If recent service history is found:
  • verify correct replacement module was installed
    • HVBOM may be used to verify correct part application
  • 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 customer vehicle
    • return the swapped module to source vehicle and obtain new replacement module

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC may set if the driver door is not fully closed during the self-test.

• Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM .

• Road test the vehicle.

• Using a diagnostic scan tool, carry out the GSM self-test.

• Ignition OFF.

• Disconnect GSM C3532 .

• Disconnect SOBDMC C199A .

• Disconnect PCM C1381B .

• Inspect the connectors for damaged or pushed-out terminals.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C3532-13		C199A-32
  C3532-14		C199A-22

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C3532-13		Ground
  C3532-14		Ground

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC may set if the driver door is not fully closed during the self-test.

• Ignition OFF.

• Disconnect and inspect the GSM , SOBDMC and all related in-line electrical 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

• Connect all disconnected electrical connectors. Make sure they seat and latch correctly.

• Using the diagnostic scan tool, clear all diagnostic trouble codes (DTCs).

• Road test the vehicle.

• Carry out the GSM self-test.

Normal Operation and Fault Conditions

It is common for multiple vehicle platforms to share a common powertrain while differing in other features such as shift by wire. It is possible to install a SOBDMC that is compatible with the engine and transmission, but not with shift by wire. A SOBDMC that is compatible with shift by wire will send out a compatibility communication signal to the GSM . Each time the GSM wakes up from sleep mode, it will check to make sure that the SOBDMC installed in the vehicle is compatible with shift-by wire.

DTC Fault Trigger Conditions

Possible Sources

• Low system voltage
• Incorrect PMI
• Incorrect or corrupted SOBDMC calibration
• Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
• SOBDMC fault

• Using a diagnostic scan tool, review all continuous memory diagnostic trouble codes (CMDTCs) in all modules.

NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.

• Check the vehicle service history for recent service actions related to the SOBDMC . If recent service history is found:
  • verify correct replacement module was installed
    • HVBOM may be used to verify correct part application
  • 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 customer vehicle
    • return the swapped module to source vehicle and obtain new replacement module

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC may set if the driver door is not fully closed during the self-test.

• Using a diagnostic scan tool, program the SOBDMC with the latest calibration.
  REFER to: Module Programming (418-01 Module Configuration, General Procedures).
  

• Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM .

• Ignition OFF.

• Wait 10 seconds.

• Start the engine.

• Move the selector lever to each gear position. Let the vehicle move both forward and in reverse.

• Using a diagnostic scan tool, carry out the GSM self-test.

• Ignition OFF.

• Disconnect and inspect all SOBDMC 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

• Connect the SOBDMC connectors. Make sure they seat and latch correctly.

• Operate the system and verify the concern is still present.

Normal Operation and Fault Conditions

The GSM and SOBDMC communicate over both HS-CAN and a private powertrain CAN .

DTC Fault Trigger Conditions

Possible Sources

• Low system voltage
• Incorrect PMI
• Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
• SOBDMC fault

• Using a diagnostic scan tool, carry out the SOBDMC self-test.

• Using a diagnostic scan tool, review all continuous memory diagnostic trouble codes (CMDTCs) in all modules.

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC may set if the driver door is not fully closed during the self-test.

• Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM .

• Road test the vehicle.

• Using a diagnostic scan tool, carry out the GSM self-test.

NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.

• Check the vehicle service history for recent service actions related to the SOBDMC . If recent service history is found:
  • verify correct replacement module was installed
    • HVBOM may be used to verify correct part application
  • 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 customer vehicle
    • return the swapped module to source vehicle and obtain new replacement module

• Ignition OFF.

• Disconnect and inspect all SOBDMC 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

• Connect the SOBDMC connectors. Make sure they seat and latch correctly.

• Operate the system and verify the concern is still present.

Normal Operation and Fault Conditions

The GSM expects to receive network data from other modules on HS-CAN2 . The GSM will set a DTC when it does not receive expected messages from another module. Other modules that require data from the suspect module may also set a lost communication DTC .

DTC Fault Trigger Conditions

Possible Sources

• Suspect module fault
• Low system voltage
• Incorrect PMI
• High network traffic event
• Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals

• Using a diagnostic scan tool, carry out a self-test on the suspect module.

• Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from all modules.

• Using a diagnostic scan tool, review all continuous memory diagnostic trouble codes (CMDTCs) in all modules.

NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.

• CHECK the vehicle service history for recent service actions related to the suspect module or to the GSM . If recent service history is found:
  • verify correct replacement module was installed
    • HVBOM may be used to verify correct part application
  • 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 customer vehicle
    • return the swapped module to source vehicle and obtain new replacement module

• Ignition OFF.

• Refer to Wiring Diagrams Cell 14 for schematic and connector information. Disconnect all in-line CAN connectors between the GSM and the suspect module.

• Using a good light source, inspect all disconnected electrical connectors for the following:
  • 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
  • spread terminals - install new terminals as necessary

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC may set if the driver door is not fully closed during the self-test.

• Using a diagnostic scan tool, clear all diagnostic trouble codes from the GSM .

• Road test the vehicle.

• Using a diagnostic scan tool, carry out the GSM self-test.

• Ignition OFF.

• Disconnect and inspect all suspect module 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

• Connect the suspect module connectors. Make sure they seat and latch correctly.

• Operate the system and verify the concern is still present.

Yes

CHECK for an applicable TSB , GSB , SSM , or FSA . If a service bulletin exists for this concern, discontinue this test and follow bulletin instructions. If none address this concern, INSTALL a new suspect module. For U0100, INSTALL a new SOBDMC . After programming the new SOBDMC , CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download (307-01B Automatic Transmission - Automatic Transmission – HF45, General Procedures). For U0121,    VIN required to access Guided Routine (ABS) For U0140, INSTALL a new BCM. Refer to the appropriate Removal and Installation procedure in Section 419-10. For U0155, INSTALL a new IPC. Refer to the appropriate Removal and Installation procedure in Section 413-01.

• Ignition OFF.

• Disconnect GSM C3532 .

• Disconnect Gateway Module A C2431 .

• Inspect the connectors for damaged or pushed-out terminals.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C3532-3		C2431-18
  C3532-2		C2431-17

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C3532-3		Ground
  C3532-2		Ground

• Ignition OFF.

• Disconnect and inspect the GSM 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

• Connect the GSM connector. Make sure it seats and latches correctly.

• Connect all other connectors that were previously disconnected.

• Operate the system and verify the concern is still present.

Normal Operation and Fault Conditions

The GSM expects to receive network data from other modules on HS-CAN2 . The GSM will set a DTC if it receives an invalid or incomplete message from another module. Incomplete or corrupted messages typically result from high network traffic preventing the complete message from being received within the calibrated time limit.

DTC Fault Trigger Conditions

Possible Sources

• High network traffic event
• Incorrect PMI
• Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
• Suspect module

• Using a diagnostic scan tool, carry out the self-test on the suspect module.

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC may set if the driver door is not fully closed during the self-test.

• Using a diagnostic scan tool, clear all diagnostic trouble codes from the GSM .

• Road test the vehicle.

• Using a diagnostic scan tool, carry out the GSM self-test.

NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.

• CHECK the vehicle service history for recent service actions related to the suspect module or to the GSM . If recent service history is found:
  • verify correct replacement module was installed
    • HVBOM may be used to verify correct part application
  • 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 customer vehicle
    • return the swapped module to source vehicle and obtain new replacement module

• Ignition OFF.

• Refer to Wiring Diagrams Cell 14 for schematic and connector information. Disconnect and inspect all in-line CAN connectors between the GSM and the suspect module.

• 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

• Ignition OFF.

• Disconnect and inspect all suspect module 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

• Connect the suspect module connectors. Make sure they seat and latch correctly.

• Operate the system and verify the concern is still present.

Normal Operation and Fault Conditions

• Brake Shift Interlock (BSI)
  • If the rotary knob is stuck in the park position, GO to Pinpoint Test D
  • If the rotary knob can be moved from the park position, but the transmission remains in park, continue with this pinpoint test.
• Module communication
  • Carry out the GSM , BCM , and SOBDMC self-tests.
  • If any system voltage, internal module, or module communication diagnostic trouble codes (DTCs) are present, REFER to the Master DTC Chart.
  • If any of the modules do not respond to the scan tool, REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).
    
• Gear Shift Module (GSM)
  • If any diagnostic trouble codes (DTCs) are present in the GSM , RESOLVE those first. REFER to the DTC Chart.
  • Using a diagnostic scan tool, access the GSM and monitor PID GEAR_CMD. Move the rotary knob through all gear positions and make sure PID GEAR_CMD matches each gear position. If PID GEAR_CMD does not change with the position of the rotary knob, INSTALL a new GSM . REFER to: Gear Shift Module (GSM) (307-05B Automatic Transmission External Controls - Automatic Transmission – HF45, Removal and Installation).
    
• Secondary On-Board Diagnostic Control Module C (SOBDMC)
  • If any diagnostic trouble codes (DTCs) related to the transmission or GSM are present in the SOBDMC , RESOLVE those first. REFER to the Master DTC Chart.
• Park rod or park rod guide stuck
  • Inspect the park rod and park rod guide for damage or obstruction. REFER to: Transmission (307-01B Automatic Transmission - Automatic Transmission – HF45, Disassembly).
    

Possible Sources

• GSM or SOBDMC diagnostic trouble codes (DTCs)
• GSM fault
• Internal transmission components

Normal Operation and Fault Conditions

• The criteria for the return to park feature was met
  • Check the system for normal operation. REFER to: External Controls - Overview (307-05B Automatic Transmission External Controls - Automatic Transmission – HF45, Description and Operation).
    
• Driver door ajar switch, circuits, Body Control Module (BCM), Gear Shift Module (GSM)
  • Open then close the driver door. If the door ajar icon is illuminated on the IPC with the door closed, REFER to: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
    
  • If the door ajar system is operating correctly, GO to Pinpoint Test E

Possible Sources

• Normal system operation
• Door ajar system
• Connector or terminal damaged, or circuit open or shorted
• GSM fault

Normal Operation and Fault Conditions

• Driver door ajar switch, circuits, Body Control Module (BCM), Gear Shift Module (GSM)
  • Open then close the driver door. If the door ajar icon is illuminated on the IPC with the door closed, REFER to: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
    
  • If the door ajar system is operating correctly, GO to Pinpoint Test E

Possible Sources

• Door ajar system
• Connector or terminal damaged, or circuit open or shorted
• GSM fault

Normal Operation and Fault Conditions

• Gear Shift Module (GSM)
  • If any diagnostic trouble codes (DTCs) are present in the GSM , RESOLVE those first. REFER to the DTC Chart.
  • Using a diagnostic scan tool, access the GSM and monitor PID GEAR_CMD. Move the rotary knob through all gear positions and make sure PID GEAR_CMD matches each gear position. If PID GEAR_CMD does not change with the position of the rotary knob, INSTALL a new GSM . REFER to: Gear Shift Module (GSM) (307-05B Automatic Transmission External Controls - Automatic Transmission – HF45, Removal and Installation).
    
• Secondary On-Board Diagnostic Control Module C (SOBDMC)
  • If any diagnostic trouble codes (DTCs) related to the transmission or GSM are present in the SOBDMC , RESOLVE those first. REFER to the Master DTC Chart.
• Park rod or park rod guide stuck
  • Inspect the park rod and park rod guide for damage or obstruction. REFER to: Transmission (307-01B Automatic Transmission - Automatic Transmission – HF45, Disassembly).
    

Possible Sources

• GSM fault
• Park is manually released
• Internal transmission park components