Fuel Pump Circuit Test
- Turn ignition on with engine off. Fuel pump should operate for 3 seconds. If fuel pump operates for 3 seconds, fuel pump and main relay circuits are functioning properly. If fuel pump does not operate for 3 seconds, connect Pink/Black and Black/White wires of fuel pump relay harness using jumper wires. See the FUEL PUMP RELAY LOCATION table under RELAYS & SOLENOIDS. Turn ignition on. If fuel pump operates, go to next step. If fuel pump does not operate, go to step 4).
- If fuel pump operates, check for power at Black/White wire terminal of fuel pump relay. If power is not present, check fuse No. 7 and Black/White wire circuit to fuel pump relay and repair as required. If power is present at Black/White wire terminal of fuel pump relay, check Pink wire ground circuit from fuel pump relay to ECM.
- To test fuel pump relay and/or ground circuit, ground Pink wire terminal of fuel pump relay and listen for fuel pump operation. If fuel pump operates, relay is okay. Check Pink wire ground circuit to ECM and repair as required. If ground circuit is okay, replace ECM. If fuel pump does not operate and there is power at Blue/Black and Black/White wire terminals, replace relay.
- If fuel pump did not operate in step 1), check for power at Blue/Black wire terminal of relay. If relay terminal has power, check for power at Pink/Blue wire terminal of fuel pump connector. If wire terminal does not have power, repair Pink/Blue wire circuit to fuel pump. If fuel pump does have power, check ground wire circuit. If ground wire circuit is okay, replace fuel pump.