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If you found corrosion on the IDM connector, that could be the cause of your PCM-to-IDM communication error. There could be corrosion on the PCM connector as well. I would check that as well (it's a PITA to get at though - probably easier to inspect by removing the PCM and looking thru the opening in the firewall.)
 

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Discussion Starter #42
That's what I was thinking/hoping! I found no corrosion on the IDM harness but I did on the harness to the pcm on the IDM pin.
 
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