Main Relay (Computer/Fuel System): Description and Operation
PURPOSE/OPERATIONWhen the ignition switch is turned on, battery voltage is applied from the ignition switch to the engine control module, turning ON the ignition power transistor and energizing the multi-point fuel injection control relay coil. This turns ON the multi-point fuel injection control relay switch, and supplies power from the battery to the engine control module through the multi-point fuel injection control relay switch.