Throttle Body

Throttle body controls amount of air entering intake manifold. Mounted on the throttle body are the TPS and IAC valves. The TPS enables ECM to determine throttle position under all operating conditions.

Throttle body contains vacuum ports used to supply signals to various components. On some models, engine coolant is routed through bottom of throttle body to warm housing and prevent icing. See Fig 1.

Fig 1: Exploded View of Typical Throttle Body