Test Procedure
- 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. - RF2 CHECK THE REDUCTANT PRESSURE SENSOR OPERATION
- IGNITION ON, ENGINE OFF.
- FOR TRANSIT,
- ACCESS THE DCU 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.
- FOR ALL OTHERS,
- 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. - RF3 CHECK THE REDUCTANT PRESSURE SENSOR CIRCUITS FOR AN OPEN
- IGNITION OFF.
- FOR TRANSIT,
- REDUCTANT PRESSURE SENSOR CONNECTOR DISCONNECTED.
- REDUCTANT DOSAGE CONTROL MODULE CONNECTOR DISCONNECTED.
- MEASURE THE RESISTANCE BETWEEN:
(+) REDUCTANT PRESSURE SENSOR CONNECTOR, HARNESS SIDE (-) REDUCTANT DOSAGE CONTROL MODULE CONNECTOR, HARNESS SIDE RDP - PIN 2 RDP - PIN 60 VREF - PIN 1 VREF - PIN 26 SIGRTN - PIN 3 SIGRTN - PIN 81 - FOR ALL OTHERS,
- REDUCTANT PUMP ASSEMBLY CONNECTOR DISCONNECTED.
- PCM-E CONNECTOR DISCONNECTED.
- PCM-T CONNECTOR DISCONNECTED.
- MEASURE THE RESISTANCE BETWEEN:
(+) REDUCTANT PUMP ASSEMBLY CONNECTOR, HARNESS SIDE (-) PCM-E CONNECTOR, HARNESS SIDE RDP - PIN 4 RDP - PIN 72 - MEASURE THE RESISTANCE BETWEEN:
(+) REDUCTANT PUMP ASSEMBLY CONNECTOR, HARNESS SIDE (-) PCM-T CONNECTOR, HARNESS SIDE VREF - PIN 5 VREF SIGRTN - PIN 3 SIGRTN
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 RDCM AND PCM DTCS. REPEAT THE SELF-TEST.
FOR ALL OTHERS, REPAIR THE OPEN CIRCUIT. CLEAR THE RDCM AND PCM DTCS. REPEAT THE SELF-TEST. - RF4 CHECK THE REDUCTANT PRESSURE SENSOR CIRCUITS FOR A SHORT TO GROUND
- FOR TRANSIT,
- MEASURE THE RESISTANCE BETWEEN:
(+) REDUCTANT PRESSURE SENSOR CONNECTOR, HARNESS SIDE (-) RDP - PIN 2 GROUND VREF - PIN 1 GROUND SIGRTN - PIN 3 GROUND - FOR ALL OTHERS,
- MEASURE THE RESISTANCE BETWEEN:
(+) REDUCTANT PUMP ASSEMBLY CONNECTOR, HARNESS SIDE (-) RDP - PIN 4 GROUND VREF - PIN 5 GROUND SIGRTN - PIN 3 GROUND
ARE THE RESISTANCES GREATER THAN 10K OHMS?
YES NO GO TO RF5. REPAIR THE SHORT CIRCUIT. CLEAR THE RDCM AND PCM DTCS. REPEAT THE SELF-TEST. - RF5 CHECK THE REDUCTANT PRESSURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE
- IGNITION ON, ENGINE OFF.
- FOR TRANSIT,
- MEASURE THE VOLTAGE BETWEEN:
(+) REDUCTANT PRESSURE SENSOR CONNECTOR, HARNESS SIDE (-) RDP - PIN 2 GROUND VREF - PIN 1 GROUND SIGRTN - PIN 3 GROUND - FOR ALL OTHERS,
- MEASURE THE VOLTAGE BETWEEN:
(+) REDUCTANT PUMP ASSEMBLY CONNECTOR, HARNESS SIDE (-) RDP - PIN 4 GROUND VREF - PIN 5 GROUND SIGRTN - PIN 3 GROUND
IS ANY VOLTAGE PRESENT?
YES NO REPAIR THE SHORT CIRCUIT. CLEAR THE RDCM AND 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 RDCM AND PCM DTCS. REPEAT THE SELF-TEST.