Main Relay (Computer/Fuel System): Description and Operation

PGM-FI Main Relay




Description
The PGM-FI main relay actually contains two individual relays. This relay is located at the right side of the cowl. One relay is energized whenever the ignition is on which supplies the battery voltage to the PCM, power to the fuel injectors, and power for the second relay. The second relay is energized for two seconds when the ignition is switched ON (II), and when the engine is running, to supply power to the fuel injector relay, fuel pressure regulator shut-off solenoid valve and fuel tank internal solenoid valve.