Circuit Description

Throttle Body Assembly:

The throttle body assembly (1) attaches to the upper intake manifold. The throttle body controls the air flow into the engine, thereby controlling the engine output. The vehicle operator opens the throttle valve within the throttle body through the accelerator controls. During engine idle, the throttle valve is almost closed. A fixed air bypass orifice and the Idle Air Control (IAC) valve (2) handle the air flow control. The throttle body also provides the location for mounting the Throttle Position (TP) sensor (3).