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Pinpoint Test B: Powertrain Control Module (Pcm) Power Relay

  1. Refer to Electronic Engine Controls - 3.5L for schematic and connector information.

    Normal Operation and Fault Conditions 

    Refer to the appropriate DTC Fault Trigger Conditions..

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P0685:00 ECM/PCM Power Relay Control Circuit/Open: No Sub Type Information Sets when the ISP-R circuit indicates the ignition is in the OFF, ACC, or LOCK mode, and the amount of time the PCM remains powered through the PCM power relay exceeds a predetermined amount of time. Ability to communicate with the PCM when the ignition is in the OFF, ACC, or LOCK mode indicates a hard fault.
    PCM P068A:00 ECM/PCM Power Relay De-Energized - Too Early: No Sub Type Information Sets when the non volatile random access memory write did not complete successfully after the ignition key was turned OFF, prior to PCM shutdown. This DTC also sets when the PCM power relay is de-energized too early.
    PCM P06B8:00 Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error: No Sub Type Information Sets when the PCM detects a concern with the ability of the PCM to correctly store permanent Diagnostic Trouble Codes (DTCs).Check for other Diagnostic Trouble Codes (DTCs) and diagnose those first. Check for aftermarket performance products. Check for an electrical or charging system concern. If an updated calibration is available, update the calibration to the latest level. If an updated calibration is not available, clear the Diagnostic Trouble Codes (DTCs) and repeat the self-test. If this DTC is retrieved after a PCM reprogramming, turn the ignition OFF and allow the PCM to complete a normal power down sequence.

    Possible Causes 

    • PCM power circuitry concern
    • PCM power relay (12A646)
    • PCM (12A650)

  2. B1 CHECK FOR DTCS

    • NOTE: If the vehicle runs normally with the ignition in the OFF position, check for a damaged ignition switch or an ISP-R circuit short to voltage.

    • NOTE: If DTC P0607, P068A or P06B8 is retrieved after a PCM reprogramming, turn the ignition OFF and allow the PCM to complete a normal power down sequence. Clear the PCMDTCs and repeat the PCM self-test. If DTC P0607, P068A or P06B8 is retrieved again, continue with this pinpoint test.

    Are DTCs P0685, P0686, P0687, P0689, P068A, P0690, P06B8, P1793, P2510, or U300C present? 

    Yes  For DTCs P068A or P06B8:  GO to  B2.
    For DTCs P0689 or P2510:  GO to  B7.
    For all others:  GO to  B9.
    No  For the engine won't shut off symptom:  GO to  B9.
    For all others:  GO to  B2.

  3. B2 CHECK THE BATTERY AND CHARGING SYSTEM

    • Check the battery and charging system voltages. Refer to the appropriate service information 414-00, Charging System, Inspection and Verification..

    Are the battery and charging system voltages within specification? 

    Yes  For Mustang:  GO to  B3.
    For all others:  GO to  B5.
    No  REPAIR as necessary. REFER to the appropriate service information 414-00, Charging System, Symptom Chart to diagnose the system voltage low or battery is discharged symptom or the system voltage high symptom.Clear the PCM DTCs. REPEAT the self-test.

  4. B3 CHECK THE PCM POWER RELAY

    • Carry out the PCM power relay component test. Refer to the Wiring Diagrams Cell 149, Component Testing.

    Does the PCM power relay pass the component test? 

    Yes  GO to  B4.
    No  INSTALL a new PCM Power Relay.
    Clear the PCM DTCs. REPEAT the self-test.

  5. B4 CHECK THE B+ VOLTAGE TO PCM (POWERTRAIN CONTROL MODULE) POWER RELAY

    • Ignition OFF.

    • Disconnect PCM Power Relay connector.

    • Ignition ON.

    • Measure the voltage between:
      Positive Lead Measurement / Action Negative Lead
      B+ Pin 1, 3PCM Power Relay Connector
      GFD859753Courtesy of FORD MOTOR COMPANY
      GFD859754Courtesy of FORD MOTOR COMPANY

    Is the voltage greater than 10.5 V? 

    Yes  GO to  B5.
    No  REPAIR the open circuit.
    Clear the PCM DTCs. REPEAT the self-test.

  6. B5 CHECK THE PCMRC CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect PCM connector.

    • For Mustang,

    • Measure the resistance between:
      Positive Lead Measurement / Action Negative Lead
      PCMRC Pin 2PCM Power Relay Connector
      GFD859755Courtesy of FORD MOTOR COMPANY
      		 PCMRC Pin B74PCM Connector

    • For Bronco, E-Series, Expedition, F-150, Motorhome, Navigator, and Ranger,

    • Disconnect BJB-C connector.

    • Measure the resistance between:
      Positive Lead Measurement / Action Negative Lead
      PCMRC Pin 20BJB-C Connector
      GFD859755Courtesy of FORD MOTOR COMPANY
      		 PCMRC Pin B74PCM Connector

    • For F-650 / F-750,

    • Disconnect BJB-H connector.

    • Measure the resistance between:
      Positive Lead Measurement / Action Negative Lead
      PCMRCBJB-H Connector Refer to Wiring Diagrams Cell.
      GFD859755Courtesy of FORD MOTOR COMPANY
      		 PCMRC Pin B74PCM Connector

    • For all others,

    • Disconnect BJB-B connector.

    • Measure the resistance between:
      Positive Lead Measurement / Action Negative Lead
      PCMRCBJB-B Connector
      GFD859755Courtesy of FORD MOTOR COMPANY
      		 PCMRC Pin B74PCM Connector

    Is the resistance less than 5 Ohm?? 

    Yes  GO to  B6.
    No  REPAIR the open circuit.
    Clear the PCM DTCs. REPEAT the self-test.

  7. B6 CHECK THE PCMRC CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition ON.

    • Measure the voltage between:
      Positive Lead Measurement / Action Negative Lead
      PCMRC Pin B74PCM Connector
      GFD859753Courtesy of FORD MOTOR COMPANY
      GFD859754Courtesy of FORD MOTOR COMPANY

    Is any voltage present? 

    Yes  REPAIR the short circuit.
    Clear the PCM DTCs. REPEAT the self-test.
    No  GO to  B7.

  8. B7 CHECK THE ISP-R VOLTAGE AT THE PCM (POWERTRAIN CONTROL MODULE)

    • Ignition OFF.

    • Disconnect PCM connector.

    • For Mustang,

    • Connect PCM Power Relay connector.

    • For all others,

    • Connect BJB-A connector.

    • Connect BJB-B connector.

    • Connect BJB-C connector.

    • Connect BJB-G connector.

    • Connect BJB-H connector.

    • Ignition ON.

    • Measure the voltage between:
      Positive Lead Measurement / Action Negative Lead
      ISP-R Pin B25PCM Connector
      GFD859753Courtesy of FORD MOTOR COMPANY
      GFD859754Courtesy of FORD MOTOR COMPANY

    Is the voltage greater than 10.5 V? 

    Yes  For DTCs P0689 or P2510:  GO to  B13.
    For all others:  GO to  B8.
    No  REPAIR the open circuit.
    Clear the PCM DTCs. REPEAT the self-test.

  9. B8 CHECK FOR AN OPEN VPWR CIRCUIT

    • Ignition OFF.

    • For Mustang,

    • Disconnect PCM Power Relay connector.

    • Measure the resistance between:
      Positive Lead Measurement / Action Negative Lead
      VPWR Pin 5PCM Power Relay Connector
      GFD859755Courtesy of FORD MOTOR COMPANY
      		 VPWR Pin B16, B17, B2PCM Connector

    • For F-650 / F-750,

    • Disconnect BJB-G connector.

    • Measure the resistance between:
      Positive Lead Measurement / Action Negative Lead
      VPWRBJB-G Connector
      GFD859755Courtesy of FORD MOTOR COMPANY
      		 VPWR Pin B16, B17, B2PCM Connector

    • For Bronco, E-Series, F-Series Super Duty, Motorhome, and Ranger,

    • Disconnect BJB-C connector.

    • Measure the resistance between:
      Positive Lead Measurement / Action Negative Lead
      VPWRBJB-C Connector
      GFD859755Courtesy of FORD MOTOR COMPANY
      		 VPWR Pin B16, B17, B2PCM Connector

    • For all others,

    • Disconnect BJB-B connector.

    • Measure the resistance between:
      Positive Lead Measurement / Action Negative Lead
      VPWR Pin 46BJB-B Connector
      GFD859755Courtesy of FORD MOTOR COMPANY
      		 VPWR Pin B16, B17, B2PCM Connector

    Is the resistance less than 5 Ohm?? 

    Yes  For DTC P068A:  GO to  B13.
    For Mustang: 
    INSTALL a new PCM Power relay.
    Clear the PCM DTCs. REPEAT the self-test.
    For all others: 
    INSTALL a new Battery Junction Box.
    Clear the PCM DTCs. REPEAT the self-test.
    No  REPAIR the open circuit.
    Clear the PCM DTCs. REPEAT the self-test.

  10. B9 CHECK THE PCMRC CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect PCM connector.

    • For Mustang,

    • Disconnect PCM Power Relay connector.

    • For Bronco, E-Series, Expedition, F-150, Motorhome, Navigator, and Ranger,

    • Disconnect BJB-C connector.

    • For F-650 / F-750,

    • Disconnect BJB-H connector.

    • For all others,

    • Disconnect BJB-B connector.

    • Measure the resistance between:
      Positive Lead Measurement / Action Negative Lead
      PCMRC Pin B74PCM Connector
      GFD859755Courtesy of FORD MOTOR COMPANY
      GFD859754Courtesy of FORD MOTOR COMPANY

    Is the resistance greater than 10000 Ohm?? 

    Yes  GO to  B10.
    No  REPAIR the short circuit.
    Clear the PCM DTCs. REPEAT the self-test.

  11. B10 CHECK THE ISP-R CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Measure the voltage between:
      Positive Lead Measurement / Action Negative Lead
      ISP-R Pin B25PCM Connector
      GFD859753Courtesy of FORD MOTOR COMPANY
      GFD859754Courtesy of FORD MOTOR COMPANY

    Is any voltage present? 

    Yes  REPAIR the short circuit.
    Clear the PCM DTCs. REPEAT the self-test.
    No  GO to  B12.

  12. B11 CHECK THE INJPWRM CIRCUIT FOR AN OPEN

    • Disconnect INJ connector.

    • Measure the resistance between:
      Positive Lead Measurement / Action Negative Lead
      INJPWRMPCM Connector
      GFD859755Courtesy of FORD MOTOR COMPANY
      		 VPWR Pin 2INJ Connector

    Is the resistance less than 5 Ohm?? 

    Yes  For the engine won't shut off symptom: 
    CHECK for all other module DTCs and diagnosis all other module DTCs.
    For all others:  GO to  B13.
    No  REPAIR the open circuit.
    Clear the PCM DTCs. REPEAT the self-test.

  13. B12 CHECK THE INJPWR_M PID (PARAMETER IDENTIFICATION)

    • Ignition OFF.

    • Connect BJB-A connector.

    • Connect BJB-B connector.

    • Connect BJB-C connector.

    • Connect BJB-G connector.

    • Connect PCM Power Relay connector.

    • Connect PCM connector.

    • Ignition ON.

    Access the PCM and monitor the INJPWR_M (Voltage, V) PID

    • Record the INJPWR_M PID value.

    • Ignition OFF.

    • Record the INJPWR_M PID value.

    Is the INJPWR_M PID voltage reading above 10.5 V with ignition ON and 0 V with the ignition OFF? 

    Yes  For the engine won't shut off symptom: 
    CHECK for all other module DTCs and diagnosis all other module DTCs.
    For all others:  GO to  B13.
    No  REPAIR the circuit.Clear the PCM DTCs. REPEAT the self-test.

  14. B13 CHECK FOR CORRECT PCM OPERATION

    • Ignition OFF.

    • Disconnect all the PCM connectors.

    • Visually inspect for:

      • pushed out pins
      • corrosion

    • Connect all the PCM connectors and make sure they seat correctly.

    • only available in the on-line service information

    • Verify the concern is still present.

    Is the concern still present? 

    Yes  INSTALL a new Powertrain Control Module.
    REFER to procedure 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM), Programming the VID Block for a Replacement PCM.only available in the on-line service information RVC: 
    Generate RVC only works in single-step view Generate RVC requires VIN entry 
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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