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

Description
This PGM-FI main relay is located behind the dashboard lower cover. The PGM-FI main relay actually contains two individual relays. One relay is energized whenever the ignition is on. It supplies 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, and when the engine is running. It supplies power to the fuel pump.