Chart A-7A, Fuel Pump Relay Check: Notes

With ignition on, ECM energizes fuel pump relay for 3 seconds, allowing for fuel pump operation. When fuel pump relay is de-energized, fuel pump stops operating. If engine is being cranked or is running, fuel pump will continue to operate as long as ECM is receiving ignition reference pulses. If ignition reference pulses are not detected, fuel pump will stop after 3 seconds.

1. Checks fuel pump operation with ignition switch in ON position.
2. Checks fuel pump relay switch for power.
3. Checks for faulty ECM and improper fuel pressure.
4. Checks for fuel pump circuit.
5. Checks for open in Pink wire from fuel pump relay to fuel pump.
6. Checks for faulty fuel pump relay coil for power.
7. Checks for faulty fuel pump or an open in Black wire (ground).
8. Checks for faulty fuel pump relay.
9. Checks for faulty ECM or an open in Pink/White wire from fuel pump relay to ECM.