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IAC Valve: Does it operate only at Fully-Open & Fully-Closed modes, or are there different positions ? 700 1985

posted by  ndesouza on  Mon Sep 20 12:34 CST 2004
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last visit: Sun Mar 18 15:14 CST 2012
[RELATED]

Actually the center pin needs +12V - not Ground. if you grounded the center pin and apply +12V to the outer pins, it will work - but only with one of the outer pins (I forget which one). The correct way to test it is +12V to center, and ground each of the outer ones.

Also - if the IAC is fully-opened during idle - the idle is very high as there's a very large volume of air that can pass through to the manifold. I tested this too. That's what leads me to suspect that the opening is controlled rather than being just fully opened or closed.






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