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30-05-2008, 04:20 PM
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Regular Member
Join Date: Oct 2005
Location: Townsville
Posts: 260
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Here is my best guess on how the IAC valve operates after reading my manual and a bit of detective work. As we all know the IAC valve controls the idle. It does this by opening and closing an air bypass to the throttle butterfly. My manual says that the idle is factory set but to adjust it you should disconnect the IAC valve cable and set the idle to about 700 rpm. This suggests that when the IAC is closed the idle shoule be about the 700 RPM mark. When you turn your steering wheel the power steering sensor tells the IAC valve to open and increace the revs slightly to compensate for extra load. Next is the temp sensor. When the engin is cold the temp sensor tells the IAC to open slightly to allow more air and therefor increace revs till the engin heats up. Then the temp sensor allows the IAC to go back to norm. The aircon sensor works much like the power steering and activates when aircon cycles.. Can somebody tell me what the TMAP and temp sensor does ?
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IAC valve operation
Threaded Mode