Throttle Body Assembly
WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
The throttle body contains a throttle valve that controls the amount of air entering the engine. The throttle position (TP) sensor and the idle air control (IAC) valve are both attached to the throttle body. The throttle body has an engine coolant passage that provides warming of the throttle body housing and prevents icing.
The throttle body contains vacuum ports that are located above and below the throttle valve. These vacuum ports provide the vacuum signals used by various components.