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Home › Ford › 2012 › F450 Super Duty 4D Pickup › Repair and Diagnosis › Engine Performance › System › Engine Controls - Pinpoint Tests (Diesel) › Pinpoint Tests RG: Reductant Pump › Test Procedure

Test Procedure

  1. RG1 PRELIMINARY DIAGNOSIS 

    Are DTCs P208A, P208C or P208D present? 

    Yes No
    GO to  RG2. Unable to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary. REFER to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX , if a driveability concern exists.
  2. RG2 CHECK THE REDUCTANT PUMP MOTOR FOR INTERNAL SHORTS 
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Component Side (-)
      RDPC - Pin 5 Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  RG3. INSTALL a new Reductant Pump assembly.
    REFER to the appropriate Engine Emission Control article.
  3. RG3 CHECK THE VPWR CIRCUIT FOR VOLTAGE 
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) Reductant Pump Assembly Connector, Harness Side (-)
      VPWR - Pin 3 Ground

    Is the voltage greater than 10 V? 

    Yes No
    GO to  RG4. REPAIR the open circuit. Clear the PCM DTCs.
    REPEAT the self-test.
  4. RG4 CHECK THE RDPC AND GND CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • PCM-T connector disconnected.
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Harness Side (-) PCM-T Connector, Harness Side
      RDPC - Pin 5 RDPC - Pin 23
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Harness Side (-)
      GND - Pin 4 Ground

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  RG5. REPAIR the open circuit. Clear the PCM DTCs.
    REPEAT the self-test.
  5. RG5 CHECK THE RDPC CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between:
      (+) PCM-T Connector, Harness Side (-)
      RDPC - Pin 23 Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  RG6. REPAIR the short circuit. Clear the PCM DTCs.
    REPEAT the self-test.
  6. RG6 CHECK THE RDPC CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) PCM-T Connector, Harness Side (-)
      RDPC - Pin 23 Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the PCM DTCs.
    REPEAT the self-test.    		 GO to  RG7.
  7. RG7 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.
    • 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) .    		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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