Chart A-7A, Fuel System Diagnosis (Fuel Pump Relay Check): Notes

When ignition is turned on, ECM energizes fuel pump relay for 3 seconds, allowing 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 on.
2. Checks fuel pump relay switch for power.
3. Checks for faulty ECM.
4. Checks fuel pump circuit.
5. Checks for open in Pink/Black or Black wires and for faulty fuel pump.
6. Checks fuel pump relay coil for power.
7. Checks for a faulty fuel pump relay, faulty ECM, or an open in Pink wire.