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• When Monitored: • Set Condition: Possible Causes INTERMITTENT DTC (K31) FUEL PUMP RELAY CONTROL CIRCUIT SHORTED TO GROUND (K31) FUEL PUMP RELAY CONTROL CIRCUIT OPEN OR HIGH RESISTANCE FUEL PUMP RELAY ENGINE CONTROL MODULE (ECM) Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, Clear DTCs in the Engine Control Module (ECM). With the scan tool, actuate the Fuel Pump Relay. Monitor the scan tool for at least two minutes. Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time. Start the engine. Allow the engine to reach normal operating temperature. Test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes >> Go To 2 No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 2. (K31) FUEL PUMP RELAY CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off. Remove the Fuel Pump Relay. Disconnect the Engine Control Module (ECM) connector. Measure the resistance between ground and the (K31) Fuel Pump Is the resistance below 1000.0 ohms? Yes >> Repair the (K31) Fuel Pump Relay Control circuit for a short to ground. Perform the ECM Verification Test Ver. 1. (Refer to 9 - No >> Go to 3 9 - 1540 ENGINE ELECTRICAL DIAGNOSTICS - DIESEL LX |