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Test Procedure

WARNING: This page is about a different variant/trim than selected.
  1. RF1 PRELIMINARY DIAGNOSIS 

    Are DTCs P204B, P204C, P204D, or P204E present? 

    Yes No
    GO to RF2  . 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. RF2 CHECK THE REDUCTANT PRESSURE SENSOR OPERATION 
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the REDUCT_TNK_P (PRESS) PID.
    • Record the REDUCT_TNK_P PID value.
    • Carry out the SCR Dosing Measurement Test on the scan tool.
    • Record the REDUCT_TNK_P PID value.

    Does the REDUCT_TNK_P PID value change from the initial recorded value? 

    Yes No
    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. GO to RF3  .
  3. RF3 CHECK THE REDUCTANT PRESSURE SENSOR CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • Reductant Pressure Sensor connector disconnected.
    • PCM-T connector disconnected.
    • Measure the resistance between:
      (+) Reductant Pressure Sensor Connector, Harness (-) PCM-T Connector, Harness
      Side Side
      RDP - Pin 2 RDP - Pin 35
      VREF - Pin 1 VREF - Pin 1
      SIGRTN - Pin 3 SIGRTN - Pin 43

    Are the resistances less than 5 ohms? 

    Yes No
    GO to RF4  . For DTC P204E, REPAIR the open circuit.
    CARRY OUT the Selective Catalytic Reduction (SCR) System Procedure. REFER to DRIVE CYCLES .
    Clear the PCM DTCs. REPEAT the self-test.
    For all others, REPAIR the open circuit.
    Clear the PCM DTCs. REPEAT the self-test.
  4. RF4 CHECK THE REDUCTANT PRESSURE SENSOR CIRCUITS FOR A SHORT TO GROUND 
    • Measure the resistance between:
      (+) Reductant Pressure Sensor Connector, Harness Side (-)
      RDP - Pin 2 Ground
      VREF - Pin 1 Ground
      SIGRTN - Pin 3 Ground

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to RF5  . REPAIR the short circuit. Clear the PCM DTCs.
    REPEAT the self-test.
  5. RF5 CHECK THE REDUCTANT PRESSURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) Reductant Pressure Sensor Connector, Harness Side (-)
      RDP - Pin 2 Ground
      VREF - Pin 1 Ground
      SIGRTN - Pin 3 Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the PCM DTCs.
    REPEAT the self-test.    		 INSTALL a new Reductant Pump assembly. REFER to the service information , Engine Emission Control.
    CARRY OUT the Selective Catalytic Reduction (SCR) System Procedure. REFER to DRIVE CYCLES .
    Clear the PCM DTCs. REPEAT the self-test.
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