Throttle Body: Operation

Filtered air from the air cleaner enters the intake manifold through the throttle body. A throttle valve (plate) is used to supply air for idle and driving conditions.

The throttle position sensor is part the throttle body. The throttle position sensor signal is used by the PCM to determine throttle position. The PCM controls the electronic throttle control to meter air into the engine. This regulates engine power. The vehicle is in sense a "Drive by Wire" system.