K 1500 Yukon 4WD V8-5.3L VIN T (2000)
Throttle Body: Description and Operation
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).