Throttle Body: Description and Operation

Throttle Body:

THROTTLE BODY
The throttle body consists of the main bore, air bypass passage, vacuum passage (for Exhaust Gas Recirculation [EGR] system), and the following parts.
^ Throttle valve which is interlocked with the accelerator pedal and controls the amount of intake air.
^ Fast idle air valve which supplies the bypass air when the engine is cold.
^ Idle speed adjusting screw which controls the amount of bypass air to adjust idle air control duty (engine idle speed).
^ Throttle Position (TP) sensor which detects the throttle valve opening and sends a signal to the ECM.