This is an excerpt from the factory E30 repair manual instructing how to mechanically and electrically test the ICV (idle control valve) for an M20 engine.
How to test E30 ICV Idle control valve (M20 Engine)
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I have what looks like a new ICV, and paper showing it was replaced for $35 in 2024. This price makes it highly suspect. I’m getting 1000 RPM when warm and less or stall when cold.
Is there a way to test whether appropriate inputs are present on the connector from the ECU/DME?
I read somwhere that the valve should be closed if no voltages are present and open fully if 12V is applied to “the terminals”. It would be helpful to verify fully open and closed positions are present when commanded independent of the ECU/DME.