SL L4-1.9L SOHC VIN 9 (1991)
Idle Speed/Throttle Actuator - Electronic: Description and Operation
Air Flow Through Throttle Body.
Idle Air Control Wiring.
Idle Air Control Valve.
PURPOSE
The Idle Air Control (IAC) valve is used to control engine speed by controlling the amount of airflow around the throttle valve. The PCM does
this by moving the IAC pintle in and out.