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Home › Ford › 2016 › Transit-150 Base, 3.2L Eng VIN V › Repair and Diagnosis › Engine Performance › System › Engine Controls - Pinpoint Tests (Diesel) › Pinpoint Tests RH: Reductant Heater › Test Procedure

Test Procedure

  1. RH1 PRELIMINARY DIAGNOSIS 

    Are DTCs P209F, P20B9, P20BA, P20BB, P20BC, P20BD, P20BE, P20BF, P20C0, P20C1, P20C2, P20C3, P20C4, P214F, P21DD, P221C or P221D present? 

    Yes No
    For F-650/F-750 and F-Series Super Duty with DTCs P20BD, P20BE or P20C0, GO to  RH13.
    For F-650/F-750 and F-Series Super Duty with DTCs P209F, P20B9, P20BA or P20BC, GO to  RH9.
    For Transit with DTCs P20BD, P20BE, P20BF or P20C0, GO to  RH14.
    For Transit with DTCs P209F, P20B9, P20BA, P20BB or P20BC, GO to  RH9.
    For Transit with DTCs P20C1, P20C2, P20C3 or P20C4, GO to  RH18.
    For all others, GO to  RH2.    		 RETURN to SYMPTOM CHARTS for further direction.
  2. RH2 CHECK THE REDUCTANT HEATER RELAY 
    • Carry out the reductant heater relay component test. Refer to the OEM WIRING DIAGRAMS COMPONENT TESTING article.

    Is a concern present? 

    Yes No
    INSTALL a new Reductant Heater relay. Clear the PCM DTCs. REPEAT the self-test. GO to  RH3.
  3. RH3 CHECK THE REDUCTANT HEATER RELAY B+ CIRCUIT 
    • Reductant Heater Relay connector disconnected.
    • Measure the voltage between:
      (+) Reductant Heater Relay Connector, Harness Side (-)
      B+ - Pin 3 Ground

    Is the voltage greater than 10.5 V? 

    Yes No
    GO to  RH4. REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.
  4. RH4 CHECK THE REDUCTANT HEATER RELAY GND CIRCUIT 
    • Measure the resistance between:
      (+) Reductant Heater Relay Connector, Harness Side (-)
      GND - Pin 1 Ground

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  RH5. REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.
  5. RH5 CHECK THE REDUCTANT HEATER RELAY CIRCUITS FOR AN OPEN 
    • GPCM-C connector disconnected.
    • Measure the resistance between:
      (+) Reductant Heater Relay Connector, Harness Side (-) GPCM-C Connector, Harness Side
      RDHTRPWR - Pin 5 RDHTRPWR - Pin 16
      RDHTRCTRL - Pin 2 RDHTRCTRL - Pin 2

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  RH6. REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.
  6. RH6 CHECK THE REDUCTANT HEATER RELAY CIRCUITS FOR A SHORT TO GROUND 
    • Measure the resistance between:
      (+) GPCM-C Connector, Harness Side (-)
      RDHTRPWR - Pin 16 Ground
      RDHTRCTRL - Pin 2 Ground

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to  RH7. REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.
  7. RH7 CHECK THE REDUCTANT HEATER RELAY CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) GPCM-C Connector, Harness Side (-)
      RDHTRPWR - Pin 16 Ground
      RDHTRCTRL - Pin 2 Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. GO to  RH8.
  8. RH8 CHECK FOR REDUCTANT SYSTEM DTCS 
    • GPCM-C connector connected.
    • Reductant Heater Relay connector connected.
    • Ignition ON, engine OFF.
    • Clear the PCM DTCs.
    • Carry out the KOER Glow Plug Monitor Self-Test using the scan tool.
    • Carry out the PCM KOEO self-test.

    Are any reductant system DTCs present? 

    Yes No
    INSTALL a new GPCM. Refer to the Service Information, Glow Plug System.
    Clear the PCM DTCs. REPEAT the self-test.    		 For DTC P20BB, GO to  RH9.
    For DTC P20BF, GO to  RH13.
    For all others, GO to  RH22.
  9. RH9 CHECK THE REDUCTANT TANK HEATER RESISTANCE 
    • Ignition OFF.
    • For F-650/F-750,
    • Reductant Pump Assembly connector disconnected.
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Harness Side (-) Reductant Pump Assembly Connector, Harness Side
      RDHTRC1 GND
    • For all others,
    • Reductant Heater and Sender Assembly connector disconnected.
    • Measure the resistance between:
      (+) Reductant Heater and Sender Assembly Connector, Component Side (-) Reductant Heater and Sender Assembly Connector, Component Side
      RDHTRC1 - Pin 1 GND - Pin 2

    Is the resistance between 1 - 2.5 ohms? 

    Yes No
    GO to  RH10. For F-650/F-750, INSTALL a new Reductant Pump assembly. REFER to the Service Information, Engine Emission Control.
    Clear the PCM DTCs. REPEAT the self-test.
    For all others, INSTALL a new Reductant Heater and Sender assembly. REFER to the Service Information, Engine Emission Control. Clear the RDCM and PCM DTCs. REPEAT the self-test.
  10. RH10 CHECK THE REDUCTANT TANK HEATER CIRCUITS FOR AN OPEN 
    • For Transit,
    • Reductant Dosage Control Module connector disconnected.
    • Measure the resistance between:
      (+) Reductant Heater and Sender Assembly Connector, Harness Side (-) Reductant Dosage Control Module Connector, Harness Side
      RDHTRC1 - Pin 1 RDHTRC1 - Pin 4
    • Measure the resistance between:
      (+) Reductant Heater and Sender Assembly Connector, Harness Side (-)
      GND - Pin 2 Ground
    • For F-650/F-750,
    • GPCM-C connector disconnected.
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Harness Side (-) GPCM-C Connector, Harness Side
      RDHTRC1 RDHTRC1 - Pin 15
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Harness Side (-)
      GND Ground
    • For all others,
    • GPCM-C connector disconnected.
    • Measure the resistance between:
      (+) Reductant Heater and Sender Assembly Connector, Harness Side (-) GPCM-C Connector, Harness Side
      RDHTRC1 - Pin 1 RDHTRC1 - Pin 15
    • Measure the resistance between:
      (+) Reductant Heater and Sender Assembly Connector, Harness Side (-)
      GND - Pin 2 Ground

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  RH11. REPAIR the open circuit. Clear the RDCM and PCM DTCs. REPEAT the self-test.
  11. RH11 CHECK THE RDHTRC1 CIRCUIT FOR A SHORT TO GROUND 
    • For F-650/F-750,
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Harness Side (-)
      RDHTRC1 Ground
    • For all others,
    • Measure the resistance between:
      (+) Reductant Heater and Sender Assembly Connector, Harness Side (-)
      RDHTRC1 - Pin 1 Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  RH12. REPAIR the short circuit. Clear the RDCM and PCM DTCs. REPEAT the self-test.
  12. RH12 CHECK THE REDUCTANT TANK HEATER CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • For F-650/F-750,
    • Measure the voltage between:
      (+) Reductant Pump Assembly Connector, Harness Side (-)
      RDHTRC1 Ground
      GND Ground
    • For all others,
    • Measure the voltage between:
      (+) Reductant Heater and Sender Assembly Connector, Harness Side (-)
      RDHTRC1 - Pin 1 Ground
      GND - Pin 2 Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the RDCM and PCM DTCs. REPEAT the self-test. For Transit, GO to  RH23.
    For all others, GO to  RH22.
  13. RH13 CHECK THE REDUCTANT PRESSURE LINE HEATER RESISTANCE 
    • Ignition OFF.
    • Reductant Pressure Line Heater Assembly connector disconnected.
    • Measure the resistance between:
      (+) Reductant Pressure Line Heater Assembly Connector, Component Side (-) Reductant Pressure Line Heater Assembly Connector, Component Side
      RDHTRC2 GND

    Is the resistance between 3 - 5 ohms? 

    Yes No
    For F-650/F-750, GO to  RH15.
    For all others, GO to  RH14.    		 INSTALL a new Reductant Pressure Line Heater assembly. REFER to the Service Information, Engine Emission Control. Clear the RDCM and PCM DTCs. REPEAT the self-test.
  14. RH14 CHECK THE REDUCTANT PUMP ASSEMBLY HEATER RESISTANCE 
    • Reductant Pump Assembly connector disconnected.
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Component Side (-) Reductant Pump Assembly Connector, Component Side
      RDHTRC2 GND

    Is the resistance between 2.5 - 6 ohms? 

    Yes No
    GO to  RH15. INSTALL a new Reductant Pump assembly. REFER to the Service Information, Engine Emission Control. Clear the RDCM and PCM DTCs. REPEAT the self-test.
  15. RH15 CHECK THE REDUCTANT PRESSURE LINE HEATER ASSEMBLY AND REDUCTANT PUMP ASSEMBLY CIRCUITS FOR AN OPEN 
    • For Transit,
    • Reductant Dosage Control Module connector disconnected.
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Harness Side (-) Reductant Dosage Control Module Connector, Harness Side
      RDHTRC2 RDHTRC2 - Pin 2
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Harness Side (-)
      GND Ground
    • For F-650/F-750,
    • GPCM-C connector disconnected.
    • Measure the resistance between:
      (+) Reductant Pressure Line Heater Assembly Connector, Harness Side (-) GPCM-C Connector, Harness Side
      RDHTRC2 RDHTRC2 - Pin 13
    • Measure the resistance between:
      (+) Reductant Pressure Line Heater Assembly Connector, Harness Side (-)
      GND Ground
    • For all others,
    • GPCM-C connector disconnected.
    • Measure the resistance between:
      (+) Reductant Pressure Line Heater Assembly Connector, Harness Side (-) GPCM-C Connector, Harness Side
      RDHTRC2 RDHTRC2 - Pin 13
    • Measure the resistance between:
      (+) Reductant Pressure Line Heater Assembly Connector, Harness Side (-)
      GND Ground
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Harness Side (-) GPCM-C Connector, Harness Side
      RDHTRC2 RDHTRC2 - Pin 13
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Harness Side (-)
      GND Ground

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  RH16. REPAIR the open circuit. Clear the RDCM and PCM DTCs. REPEAT the self-test.
  16. RH16 CHECK THE RDHTRC2 CIRCUIT FOR A SHORT TO GROUND 
    • For F-650/F-750,
    • Measure the resistance between:
      (+) Reductant Pressure Line Heater Assembly Connector, Harness Side (-)
      RDHTRC2 Ground
    • For all others,
    • Measure the resistance between:
      (+) Reductant Pump Assembly Connector, Harness Side (-)
      RDHTRC2 Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  RH17. REPAIR the short circuit. Clear the RDCM and PCM DTCs. REPEAT the self-test.
  17. RH17 CHECK THE REDUCTANT PRESSURE LINE HEATER ASSEMBLY AND REDUCTANT PUMP ASSEMBLY CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • For Transit,
    • Measure the voltage between:
      (+) Reductant Pump Assembly Connector, Harness Side (-)
      RDHTRC2 Ground
      GND Ground
    • For F-650/F-750,
    • Measure the voltage between:
      (+) Reductant Pressure Line Heater Assembly Connector, Harness Side (-)
      RDHTRC2 Ground
      GND Ground
    • For all others,
    • Measure the voltage between:
      (+) Reductant Pressure Line Heater Assembly Connector, Harness Side (-)
      RDHTRC2 Ground
      GND Ground
    • Measure the voltage between:
      (+) Reductant Pump Assembly Connector, Harness Side (-)
      RDHTRC2 Ground
      GND Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the RDCM and PCM DTCs. REPEAT the self-test. For Transit, GO to  RH23.
    For all others, GO to  RH22.
  18. RH18 CHECK THE REDUCTANT PRESSURE LINE HEATER RESISTANCE 
    • Ignition OFF.
    • Reductant Pressure Line Heater Assembly connector disconnected.
    • Measure the resistance between:
      (+) Reductant Pressure Line Heater Assembly Connector, Component Side (-) Reductant Pressure Line Heater Assembly Connector, Component Side
      RDHTRC3 GND

    Is the resistance between 3 - 5 ohms? 

    Yes No
    GO to  RH19. INSTALL a new Reductant Pressure Line Heater assembly. REFER to the Service Information, Engine Emission Control. Clear the RDCM and PCM DTCs. REPEAT the self-test.
  19. RH19 CHECK THE REDUCTANT PRESSURE LINE HEATER CIRCUITS FOR AN OPEN 
    • Reductant Dosage Control Module connector disconnected.
    • Measure the resistance between:
      (+) Reductant Pressure Line Heater Assembly Connector, Harness Side (-) Reductant Dosage Control Module Connector, Harness Side
      RDHTRC3 RDHTRC3 - Pin 6
    • Measure the resistance between:
      (+) Reductant Pressure Line Heater Assembly Connector, Harness Side (-)
      GND Ground

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  RH20. REPAIR the open circuit. Clear the RDCM and PCM DTCs. REPEAT the self-test.
  20. RH20 CHECK THE RDHTRC3 CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between:
      (+) Reductant Pressure Line Heater Assembly Connector, Harness Side (-)
      RDHTRC3 Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  RH21. REPAIR the short circuit. Clear the RDCM and PCM DTCs. REPEAT the self-test.
  21. RH21 CHECK THE REDUCTANT PRESSURE LINE HEATER ASSEMBLY CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) Reductant Pressure Line Heater Assembly Connector, Harness Side (-)
      RDHTRC3 Ground
      GND Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the RDCM and PCM DTCs. REPEAT the self-test. GO to  RH23.
  22. RH22 CHECK FOR CORRECT GPCM OPERATION 
    • Disconnect all the GPCM connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the GPCM connectors and make sure they seat correctly.
    • Verify the concern is still present.

    Is the concern still present? 

    Yes No
    INSTALL a new GPCM. Refer to the Service Information, Glow Plug System.
    Clear the PCM DTCs. REPEAT the self-test.    		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  23. RH23 CHECK FOR CORRECT REDUCTANT DOSAGE CONTROL MODULE OPERATION 
    • Reductant Dosage Control Module connector disconnected.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect the reductant dosage control module connector and make sure it seats correctly.
    • Carry out the DCU self-test.
    • Verify the concern is still present.

    Is the concern still present? 

    Yes No
    INSTALL a new Reductant Dosage Control module. REFER to the Service Information, Electronic Engine Controls. The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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