Main Relay (Fuel Injection)

The main relay actually contains 2 individual relays. One relay is energized whenever the ignition is on, which supplies battery voltage to the ECU, power to the injectors (except Civic 1.5L and CRX Std.), and power for the second relay. The second relay supplies power to the fuel pump (and injectors on Civic 1.5L and CRX Std.). The second relay is energized for 2 seconds when the ignition switch is initially turned on and when the engine is running.