Idle air control :
This is a solenoide which is controlled by the ECU . This solenoide controls the amount of air bypassing the throttle butterfly and entering the intake manifold to keep the car running when the engine is at idle and the throttle fly is not open to allow air inside the intake manifold so it can have sufficient air to keep the car running smoothly. It is a PMW and the frequency increases as the engine RPM increases and the On time gets smaller.
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