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"Due to the AIC motor's continuous, limited-travel reciprocating action (noticeable only as vibration), the opening of the valve can be varied within extremely short periods of time (opening/closing in about 150-200 milliseconds). This permits the air flowing through the valve to be controlled at all times so that the volume necessary for obtaining the desired constant or increased idle speed can be achieved as required."
The throttle position switch activates the IAC when the throttle is closed. Some times someone will attempt to adjust the throttle stop screw to raise the idle to compensate for stalling due to a vac leak or dirty throttle body. At this high position the throttle will not close enough to 'click' the throttle position switch. If the computer doesn't recieve the signal from the TPS that the throttle is closed, you will run about 1500rpm. With your car off, crack the throttle. If you don't hear a click, adjust your throttle stop screw downward till you can hear the click when you crack you throttle. Now your AIC will kick in and do its job. Of course make sure your IAC, TPS are plugged in and that you have a clean throttle body and have checked for air leaks from the intake hose to all the vac lines on the top AND back of the throttle body. Once the Air passes through the air mass meter and is measured, no more air should Sneak in. Your computer makes its calculation from information from the AMM. Any 'Unmetered' air will cause high idle, and erratic running..
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