Idle Speed/Throttle Actuator - Electronic: Description and Operation

Throttle Body View Without EGR System:

LOCATION

Mounted on throttle body.

PURPOSE

Maintains optimum idle speed under varying engine loads.

Prevents deceleration die out.

OPERATION

Powertrain Control Module (PCM) calculates proper idle speed using information from throttle position, vehicle speed, and coolant temperature sensors and brake, and neutral/safety switches.

PCM controls idle speed by actuating motor, varying air flow through bypass in throttle body.

Prevents decel die out by increasing air flow when throttle is closed suddenly.