POWER SUPPLY CONTROL
When the IG ON signal is input by the ignition switch, the engine-ECU or engine-A-M/T-ECU turns ON the power transistor for controlling the engine control relay. As a result, current flows through the coil in the engine control relay, causing the relay switch to turn ON and supply power to the sensors and actuators.
When the IG OFF signal is input by the ignition switch, the engine-ECU or engine-A-M/T-ECU turns OFF the power transistor for controlling the engine control relay after approximately 10 seconds have elapsed.
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