Circuit Description

WARNING: This page is about a different car, the 2003 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.

The electric throttle control system (ETCS) is composed of the throttle motor to operate the throttle valve, the throttle position sensor to detect the opening angle of the throttle valve, the accelerator pedal position sensor to detect the accelerator pedal position, the ECM to control the ETCS, and the 1 valve type throttle body.

The ECM controls the throttle motor to make the throttle valve opening angle properly in response to the driving condition. The throttle position sensor which is mounted on the throttle body detects the opening angle of the throttle valve and it provides feedback to the ECM to control the throttle motor.

If the ETCS has a malfunction, 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. This electrical throttle system does not use the throttle cable. Detecting condition of DTC is when the throttle opening angle continues to vary greatly from target throttle opening angle.