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07-01-2010, 12:25 PM
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3800 GM purple wire at ICM
ok we have a 2000 monte carlo here we just put a replacement 4L60E in it and all that went perfectly well easy simple job and runs drives great we noticed top rad hose leaking at therm housing weak factory clamp fixed that and while we were doing that i noticed a purple wire someone rigged from the purple with white stripe wire in the ICM harness over to driver side under brake booster area somewhere dont know
anyone know what the purple and white strip wire at the ICM is for? maybe will learn something interesting here 
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07-01-2010, 01:50 PM
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That is the 3X signal wire from ICM->PCM. That is 1 of 2 signals generated from the crank sensor. The 3x is for sequential fuel injection and determing which coil to fire within 120(1/6 of cam rotation) degrees of crank rotation along with calculating rpms. A car will run if the 3x signal is lost after starting but it should not start if not present during cranking(not 100% sure on that).
That is a common circuit utilized by aftermarket alarms and remote starts. Also, don't you mean a 4T60E? 
Last edited by ethn_bert; 07-01-2010 at 02:01 PM.
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