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• When Monitored: • Set Condition: Possible Causes CHECK FOR OTHER DTCS INTERMITTENT CONDITION SUBSTITUTE MAIN RELAY (K51) MAIN RELAY CONTROL CIRCUIT OPEN INTERMITTENTLY ENGINE CONTROL MODULE Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. CHECK FOR OTHER DTCS Turn the ignition on. With the scan tool, check for additional DTCs. Are other DTCs present? Yes >> Refer to the Symptom List for diagnosis of the other DTCs before continuing. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Go To 2 2. CLEAR CODE AND CHECK IF THE DTC RESETS With the scan tool, erase ECM DTCs. Perform several ignition key cycles, pausing for at least 10 seconds between each cycle. Turn the ignition on. With the scan tool, read ECM DTCs. Did this DTC set again? Yes >> Go To 3 No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 3. MAIN RELAY Turn the ignition off. Install a known good relay in place of the Main Relay. Turn the ignition on. With the scan tool, erase ECM DTCs. Perform several ignition key cycles, pausing for at least 10 seconds between each cycle. Turn the ignition on. With the scan tool, read ECM DTCs. Did this DTC set again? Yes >> Go To 4 No >> Replace the Main Relay. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) PM ENGINE ELECTRICAL DIAGNOSTICS - DIESEL 9 - 1319 |