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• When Monitored: • Set Condition: Possible Causes (F1) FUSED IGNITION SWITCH OUTPUT CIRCUIT INTERNAL FUSED B+ CIRCUIT (K31) FUEL PUMP RELAY CONTROL CIRCUIT (K31) FUEL PUMP RELAY CONTROL CIRCUIT SHORTED TO GROUND FUEL PUMP RELAY PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. FUEL PUMP RELAY OPERATION Ignition on, engine not running. With a scan tool, actuate the Fuel Pump Relay. Is the Fuel Pump Relay operating? Yes >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 2 2. FUEL PUMP RELAY Turn the ignition off. Remove the Fuel Pump Relay from the IPM. Measure the resistance of the Fuel Pump Relay Coil. Is the resistance between 70 to 90 ohms? Yes >> Go To 3 No >> Replace the Fuel Pump Relay. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 478 ENGINE ELECTRICAL DIAGNOSTICS KJ |