Circuit Description
WARNING: This page is about a different car, the 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
Battery positive voltage is supplied to terminal +BM of the ECM even once when the ignition switch is OFF for the electric throttle control system. If this malfunction is detected ECM shuts down the power for the throttle motor, and the throttle valve is fully closed by the return spring. Throttle valve is locked at a certain opening angle. Electronically controlled throttle operation is cancelled until the system returns to normal and the ignition switch is turned OFF. See Fig 1. Possible causes are:
- Open in ETCS power source circuit.
- ECM.