Idle Speed/Throttle Actuator - Electronic: Description and Operation

IAC valve, LH 2.4.2 (M1991-)





As distinct from earlier versions, the AC valve now has two windings which correspond to each other in the event of a voltage drop, such as occurs when the AC system is engaged. Whenever necessary, a spring in the valve sets it in Limp- Home mode with a small opening which gives an engine speed of about 850 rpm when there is no load on the valve.