ENGINE CONTROL RELAY CONTROL





When the ignition switch-IG "ON" signal is input, engine-ECU turns ON the power transistor for control of the engine control relay. As a result, current flows through the engine control relay’s coil, the relay switch turns ON and power is supplied to each sensor and actuator. Also, when ignition switch-IG "OFF" signal is input, engine-ECU performs the following controls and then turns OFF the power transistor for control of engine control relay.