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Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 764 (Engine Controls - Pinpoint Tests (Diesel) - Pinpoint Tests MC - RF) >> Pinpoint Tests Re: REDUCTANT Purge Valve >> Test Procedure

Test Procedure

WARNING: This page is about a different car, the 2020 Ford F-550 Super Duty, 2020 Ford F-450 Super Duty, 2020 Ford F-350 Super Duty, 2020 Ford F-250 Super Duty, and 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. RE1 PRELIMINARY DIAGNOSIS 

    Are DTCs P20A0, P20A2 or P20A3 present? 

    Yes No
    GO to  RE2. 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.
    RETURN to SYMPTOM CHARTS for further direction.
  2. RE2 CHECK THE REDUCTANT PURGE VALVE SOLENOID RESISTANCE 
    • Ignition OFF.
    • For Transit Connect,
    • Reductant Pump Assembly connector disconnected.
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Component Side (-) Reductant Pump Assembly Connector, Component Side
      RDPGC RDPGPWR
    • For all others,
    • Reductant Purge Valve connector disconnected.
    • Measure the resistance between:
      (+) Reductant Purge Valve Connector, Component Side (-) Reductant Purge Valve Connector, Component Side
      RDPGC VPWR

    Is the resistance between 9.72 - 11.88 ohms? 

    Yes No
    GO to  RE3. INSTALL a new Reductant Pump assembly.
    REFER to the Engine Emission Control article.
    Clear the RDCM and PCM DTCs. REPEAT the self-test.
  3. RE3 CHECK THE REDUCTANT PURGE VALVE SOLENOID FOR INTERNAL SHORTS 
    • For Transit Connect,
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Component Side (-)
      RDPGC Ground
    • For all others,
    • Measure the resistance between:
      (+) Reductant Purge Valve Connector, Component Side (-)
      RDPGC Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  RE4. INSTALL a new Reductant Pump assembly.
    REFER to the Engine Emission Control article.
    Clear the RDCM and PCM DTCs. REPEAT the self-test.
  4. RE4 CHECK THE VPWR CIRCUIT FOR VOLTAGE 
    • Ignition ON, engine OFF.
    • For Transit Connect,
    • Measure the voltage between:
      (+) Reductant Pump Assembly Connector, Harness Side (-)
      RDPGPWR Ground
    • For all others,
    • Measure the voltage between:
      (+) Reductant Purge Valve Connector, Harness Side (-)
      VPWR Ground

    Is the voltage greater than 10 V? 

    Yes No
    GO to  RE5. REPAIR the open circuit.
    Clear the RDCM and PCM DTCs. REPEAT the self-test.
  5. RE5 CHECK THE RDPGC CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Reductant Dosage Control Module connector disconnected.
    • For Transit Connect,
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Harness Side (-) Reductant Dosage Control Module Connector, Harness Side
      RDPGC RDPGC
    • For all others,
    • Measure the resistance between:
      (+) Reductant Purge Valve Connector, Harness Side (-) Reductant Dosage Control Module Connector, Harness Side
      RDPGC RDPGC

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  RE6. REPAIR the open circuit.
    Clear the RDCM and PCM DTCs. REPEAT the self-test.
  6. RE6 CHECK THE RDPGC CIRCUIT FOR A SHORT TO GROUND 
    • For Transit Connect,
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Component Side (-)
      RDPGC Ground
    • For all others,
    • Measure the resistance between:
      (+) Reductant Purge Valve Connector, Harness Side (-)
      RDPGC Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  RE7. REPAIR the short circuit.
    Clear the RDCM and PCM DTCs. REPEAT the self-test.
  7. RE7 CHECK THE RDPGC CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • For Transit Connect,
    • Measure the voltage between:
      (+) Reductant Pump Assembly Connector, Harness Side (-)
      RDPGC Ground
    • For all others,
    • Measure the voltage between:
      (+) Reductant Purge Valve Connector, Harness Side (-)
      RDPGC Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit.
    Clear the RDCM and PCM DTCs. REPEAT the self-test.    		 GO to  RE8.
  8. RE8 CHECK FOR CORRECT REDUCTANT PURGE VALVE OPERATION 
    • Reductant Pump Assembly connector connected.
    • Reductant Purge Valve connector connected.
    • Reductant Dosage Control Module connector connected.
    • Ignition ON, engine OFF.
    • Carry out the SCR Leak Test on the scan tool to pressurize the system.
    • Access the DCU and monitor the REDUCT_TNK_P (PRESS) PID.
    • Record the REDUCT_TNK_P PID value.
    • Access the DCU and control the (PER) PID.
    • Command the PID duty cycle to 100%.
    • Access the DCU and monitor the REDUCT_TNK_P (PRESS) PID.

    Does the REDUCT_TNK_P PID value decrease? 

    Yes No
    The system is operating correctly at this time.
    The concern may have been caused by a loose or corroded connector.    		 INSTALL a new Reductant Pump assembly.
    REFER to the Engine Emission Control article.
    Clear the RDCM and PCM DTCs. REPEAT the self-test.
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