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

PURPOSE/OPERATION
The PGM-FI main relay actually contains two individual relays.
The relay is located at the left side of the cowl. One relay is energized whenever the ignition is on, which supplies the battery voltage to the ECM, power to the fuel injectors, and power for the second relay. The second relay is energized for 2 seconds when the ignition is switched on, and when the engine is running, to supply power to the fuel pump.