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= Idle Air Control = The early type is a simple solanoid which allows a vaccum to pass to a set of bellows that move against the throttle plate stop. Most people remove these when going to a stand-alone system, as they do not work very well after 25years of service. The newer 20v engines have a two coil IAC (marked as A in this diagram) http://vems.hu/www.vems.co.uk/VEMSInstalls/4AQuestion.jpg One coil opens the IAC valve, the other closes it, with neither coil active the IAC valve sits at 50%. A simple solution is to use a Relay to ground one coil or the other http://vems.hu/www.vems.co.uk/VEMSInstalls/IACRelay.png http://vems.hu/www.vems.co.uk/VEMSInstalls/IACRelay.jpg In order to PWM the solanoid for the best results a FET driver with one inverting and one non-inverting output (such as the TC4428) may be used: http://vems.hu/www.vems.co.uk/VEMSInstalls/ToyotaIACController.png
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