PGM-FI Main Relay

PGM-FI main relay consists of 2 relays. When ignition is on, first relay is energized and supplies battery voltage to PCM, fuel injectors and second relay. Second relay is energized for 2 seconds when ignition is turned on, (to pressurize system) and when engine is running, to supply battery voltage to the fuel pump, through the fuel pump relay on 3.5RL.