Fuel Pump Relay: Description and Operation

Fig.46 High-Pressure Fuel Shut-Off Solenoid Relay Location:

The high-pressure fuel shut-off solenoid relay is located in the Fuse and Relay Block at the left end of the instrument panel (Fig. 46).

This high-pressure fuel shut-off solenoid relay is used in place of the conventional fuel pump relay. It is used to electrically control operation of the high pressure fuel shut-off solenoid. The solenoid is located within the fuel pressure regulator.

The Powertrain Control Module (PCM) operates the high-pressure fuel shut-off solenoid relay through a ground path.

The PCM turns the ground path OFF when the ignition switch is in the OFF position. When the ignition switch is in the ON or CRANK position, the PCM monitors the crankshaft position sensor and camshaft position sensor signals to determine engine speed and ignition timing (coil dwell). If the PCM does not receive the necessary crankshaft position sensor and camshaft position sensor signals when the ignition switch is in the Run position (indicating the engine has not started and is not running), it will deenergize the relay.