MR2 Owners Club Message Board - View Single Post - Yet another fast idle problem
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post #3 of (permalink) Old January 9th, 2017, 18:45
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Originally Posted by Ryoko View Post
... Unplugging the IACV and apply voltage to the ISCC pins causes the valve to close and the idle drops to normal. So it seems the ECU is wanting to open the IACV for some reason....
Maybe the valve driver in the ECU is burned out, or the connection is broken. You might be able to tell by observing DC voltage at the terminals, or you might need to observe the waveform to tell for sure what is going on.
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