Fuel Pump Relay

The Powertrain Control Module (PCM) controls fuel pump relay operation by controlling fuel pump relay ground circuit. PCM opens ground circuit when ignition is off, and completes ground circuit when ignition is on, to provide fuel pump operation. When ignition is first turned on, fuel pump will operate for approximately one second unless engine is running, or starter is engaged and engine is cranking. If engine cranking signal is not received, PCM will de-energize fuel pump relay.

Fuel pump relay receives battery voltage from fuse No. 9, located in junction block (fuse box). Junction block is located just inboard of left end of instrument panel.

Fuel pump relay is located in Power Distribution Center. Relays are identified on label under PDC cover. PDC is located near battery in left front corner of engine compartment.

If fuel pump relay or control circuit becomes defective, a Diagnostic Trouble Code (DTC) may be stored in the PCM. See DTC TEST in TESTS W/CODES - 3.9L article. For additional information on diagnosis for fuel pump relay and control circuit, see TEST TC-101A in TESTS W/CODES - 3.9L article.