Idle air connector wiring problem
Thread Starter
Racer
Joined: Apr 2004
Posts: 306
Likes: 0
From: Cotati CA
Idle air connector wiring problem
As per the factory manual for my '89 L98, I've checked the iac connector and found that two of the four pins do not light up the test light. I've back-probed the connector and the wires are dead there, too. Checked them up near injector wire #8 and they're dead there too. Any tips on my next steps since I'm a rookie at this stuff?
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
The IAC is a stepper motor; power on one circuit turns it one way ; power on the other turns it back
Looking at the diagram the ECM controls IAC by grounding the circuits so you would only see power on the return ( ground ) side if IAC was plugged in and operational ?
Thread Starter
Racer
Joined: Apr 2004
Posts: 306
Likes: 0
From: Cotati CA
It's official...I'm a dumby! I went back to the chart and realized I forgot to ground the ALDL...when I did just now all four lit up as they should with the test light. Onward to my next dumb move!!! 
