LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2010 >> RV Cutaway 6.0 P >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Pinpoint Tests -- E-Series 6.0L Diesel Models >> Pinpoint Test A: Powertrain Control Module (PCM) Power Relay >> Test Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test Procedure

  1. A1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) 

    Is DTC P0560, P0685, P0689 or P0690 present? 

    Yes No
    For DTC P0560, GO to  A2.
    For DTCs P0685, P0689 or P0690, GO to  A3.    		 GO to  A3.
  2. A2 DTC P0560: CHECK THE BATTERY AND CHARGING SYSTEM 
    NOTE: The DTC P0560 sets when the engine is operating above 1,000 RPM. The DTC will be accompanied with a powertrain malfunction indicator (wrench) and a surge or lack of power upon accelerating.
    • Check the battery and charging system voltages. Refer to the appropriate Charging System article .

    Are the battery and charging system voltages within specifications? 

    Yes No
    GO to  A3. REPAIR as necessary. REFER to the appropriate Charging System article , Symptom Chart to continue diagnosis.
  3. A3 DTCS P0685, P0689 AND P0690: CHECK THE PCM POWER RELAY 

    Does the PCM power relay pass the component test? 

    Yes No
    GO to  A4. INSTALL a new PCM Power relay. CLEAR the DTCs. REPEAT the self-test.
  4. A4 CHECK THE B+ VOLTAGE TO PCM POWER RELAY 
    • Ignition OFF.
    • PCM Power Relay connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      VOLTAGE REFERENCE CHART

      (+) PCM Power Relay Connector, Harness Side (-)
      B+ - Pin 1, 3 Ground

    Is the voltage greater than 10 V? 

    Yes No
    GO to  A5. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  5. A5 CHECK THE PCMRC CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Ignition OFF.
    • PCM connector disconnected.
    • Measure the resistance between:
      RESISTANCE REFERENCE CHART

      (+) PCM Power Relay Connector, Harness Side (-) PCM Connector, Harness Side
      PCMRC - Pin 2 PCMRC - Pin 27

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  A6. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  6. A6 CHECK THE PCMRC CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      VOLTAGE REFERENCE CHART

      (+) PCM Connector, Harness Side (-)
      PCMRC - Pin 27 Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test. GO to  A7.
  7. A7 CHECK FOR AN OPEN VPWR CIRCUIT BETWEEN THE PCM AND THE PCM POWER RELAY 
    • Ignition OFF.
    • Measure the resistance between:
      RESISTANCE REFERENCE CHART

      (+) PCM Power Relay Connector, Harness Side (-) PCM Connector, Harness Side
      VPWR - Pin 5 VPWR - Pin B34, B46

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  A8. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  8. A8 CHECK THE PCMRC CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Ignition OFF.
    • Measure the resistance between:
      RESISTANCE REFERENCE CHART

      (+) PCM Connector, Harness Side (-)
      PCMRC - Pin 27 Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  A9. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  9. A9 CHECK THE ISP-R CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • Ignition OFF.
    • Measure the voltage between:
      VOLTAGE REFERENCE CHART

      (+) PCM Connector, Harness Side (-)
      ISP-R - Pin B3 Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test. GO to  A10.
  10. A10 CHECK THE ISP-R CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Ignition OFF.
    • Measure the resistance between:
      RESISTANCE REFERENCE CHART

      (+) PCM Connector, Harness Side (-)
      ISP-R - Pin B3 Ground

    Is the resistance greater than 10,000 ohms? 

    Yes No
    GO to  A11. REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
  11. A11 CHECK THE ISP-R VOLTAGE AT THE PCM HARNESS CONNECTOR 
    • Ignition OFF.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      VOLTAGE REFERENCE CHART

      (+) PCM Connector, Harness Side (-)
      ISP-R - Pin B3 Ground

    Is the voltage greater than 10 V? 

    Yes No
    GO to  A12. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  12. A12 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test and verify the concern is still present.

    Is the concern still present? 

    Yes No
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , PROGRAMMING THE VID BLOCK FOR A REPLACEMENT PCM . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
scientia non olet · About LEMON Manuals