Throttle Body: Description and Operation

Throttle Body Components (Turbocharged):

The throttle body houses the throttle valve (used to meter air to the engine) and the idle air bypass passages. It also serves as a mounting platform for the idle speed control servo (stepper motor), throttle position sensor, dash pot and the dash pot vacuum valve. The idle speed control servo is an ECU controlled device used in the idle speed control system and the throttle position sensor is an input sensor utilized by the ECU in determining engine operating conditions.