Throttle Body Assembly
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.