Fuel Pump Relay
WARNING: This page is about a different car, the 1997 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
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, located in power distribution center. Fuel pump relay is located in power distribution center. See Figure and Fig 1 . Power distribution center is located at driver's side 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 Figure . Power distribution center is located at driver's side front corner of engine compartment.
- Start engine and allow to idle until engine stalls. Attempt to start engine several times. Once engine will not restart. Turn ignition off.
- Disconnect electrical connector from any fuel injector. Connect jumper wire between one electrical terminal on fuel injector and positive battery terminal. Connect another jumper wire to remaining electrical terminal on fuel injector.CAUTION: DO NOT apply battery voltage to fuel injector for more than 4 seconds or fuel injector may be damaged.
- Momentarily touch remaining end of jumper wire to negative battery terminal for no more than 4 seconds. This energizes fuel injector and releases most of the fuel pressure. Fuel lines may now be disconnected. Cover fuel lines with shop before disconnecting, as some residual fuel pressure may exist.
- Disconnect jumper wires. Reinstall electrical connector on fuel injector. Reinstall fuel pump relay. Diagnostic trouble codes may be stored in Powertrain Control Module (PCM) when fuel pump relay was removed. To clear diagnostic trouble codes from PCM, see TESTS W/CODES - 3.9L article. For additional information on diagnosis for fuel pump relay and control circuit, see appropriate NO START (NS) TEST in the TESTS W/CODES - 3.9L article.