Idle Speed/Throttle Actuator - Electronic: Description and Operation

Idle Air Control (IAC) Valve

PURPOSE
The Idle Air Control (IAC) Valve is used to maintain proper idle speeds during varying conditions.

OPERATION





The IAC valve receives a continuous signal from the ECM. Using the signal the ECM is able to control the size of the air passage through the valve. Air passing through the valve bypasses the throttle plate which causes an increase in idle speed.