Operation CHARM: Car repair manuals for everyone.

Troubleshooting Hints

Circuit F18 splices to supply battery voltage to the coil side of the ASD relay and the fuel pump relay. If battery voltage is not present on the F18 circuit, the PCM will not be able to energize the relays. The ASD relay supplies battery voltage for the fuel injectors, ignition coil, and the heated oxygen sensors. The fuel pump relay powers the fuel pump module.