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Test Procedure

  1. RJ1 PRELIMINARY DIAGNOSIS 

    Are DTCs P203A, P203B, P203C, P203D, P21AB or P21B0 present? 

    Yes No
    GO to  RJ2. 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. RJ2 CHECK THE REDUCTANT LEVEL CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • Reductant Heater and Sender Assembly connector disconnected.
    • PCM-T connector disconnected.
    • Measure the resistance between:
      (+) Reductant Heater and Sender Assembly Connector, Harness Side (-) PCM-T Connector, Harness Side
      RDL1 - Pin 6 RDL1 - Pin 15
      RDL2 - Pin 7 RDL2 - Pin 18
      RDL3 - Pin 8 RDL3 - Pin 19
      RDLRTN - Pin 5 RDLRTN - Pin 32

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  RJ3. REPAIR the open circuit. Clear the PCM DTCs.
    REPEAT the self-test.
  3. RJ3 CHECK THE REDUCTANT LEVEL CIRCUITS FOR A SHORT TO GROUND 
    • Measure the resistance between:
      (+) PCM-T Connector, Harness Side (-)
      RDL1 - Pin 15 Ground
      RDL2 - Pin 18 Ground
      RDL3 - Pin 19 Ground
      RDLRTN - Pin 32 Ground

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to  RJ4. REPAIR the short circuit. Clear the PCM DTCs.
    REPEAT the self-test.
  4. RJ4 CHECK THE REDUCTANT LEVEL CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) PCM-T Connector, Harness Side (-)
      RDL1 - Pin 15 Ground
      RDL2 - Pin 18 Ground
      RDL3 - Pin 19 Ground
      RDLRTN - Pin 32 Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the PCM DTCs.
    REPEAT the self-test.    		 GO to  RJ5.
  5. RJ5 CHECK THE REDUCTANT LEVEL SENSOR FOR CORRECT OPERATION 
    • Ignition OFF.
    • PCM-T connector connected.
    • Connect a 5 amp fused jumper wire between the following:
      Point A Reductant Heater and Sender Assembly Connector, Harness Side Point B Reductant Heater and Sender Assembly Connector, Harness Side
      RDL1 - Pin 6 RDLRTN - Pin 5
      RDL2 - Pin 7 RDLRTN - Pin 5
      RDL3 - Pin 8 RDLRTN - Pin 5
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the REDUCT_LITERS (CAP) PID.

    Is the capacity greater than 18 L? 

    Yes No
    INSTALL a new Reductant Heater and Sender assembly. REFER to the appropriate Engine Emission Control article.
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to  RJ6.
  6. RJ6 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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