Circuit Description
Battery positive voltage is not supplied to terminal +BM of the ECM for the electric throttle control system. It this DTC is stored, the throttle valve is locked at a certain opening angle. Also, the whole electronically controlled throttle operation is cancelled until the system returns to normal and the ignition switch is turned OFF. See Fig 1. DTC is set when ECM detects open ETCS power source circuit. DTC is set when ECM detects open ETCS power source circuit. Possible causes are:
- Open in throttle control motor and sensor power source circuit.
- Defective ECM.