Pcm problems
Thread Starter
Staging Lane
Joined: Jun 2009
Posts: 63
Likes: 0
From: NJ
Pcm problems I had a meltdown in my car with the alternator, had the system checked and the guy said, with no certainty that the pcm may not be sending power to the alternator causing it not to charge the battery. Anyone ever hear of that before?
Yup, but its most likely the "excitor" wire. The little tiny red wire that plugs into the top of the alternator. They go bad quite often. When you start the engine this wire tells the alternator to start charging.
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Get one of these and splice it in as high up into the wiring harness as possible.
http://cgi.ebay.com/ebaymotors/LS1-A...Q5fAccessories
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http://cgi.ebay.com/ebaymotors/LS1-A...Q5fAccessories
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I would think you could start the engine with that wire unplugged, put a meter on it to see if your getting current, to see if thats the problem.
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Thread Starter
Staging Lane
Joined: Jun 2009
Posts: 63
Likes: 0
From: NJ
well thats where we were confused. We put a tester on it and got 1 volt on it. I am unsure how many volts are needed. We checked the wire for continuity and that was ok too. I had it professionaly tested and they could not find a thing either. he said it may be the pcm. I am at a loss.
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Verdad Gallardo well thats where we were confused. We put a tester on it and got 1 volt on it. I am unsure how many volts are needed. We checked the wire for continuity and that was ok too. I had it professionaly tested and they could not find a thing either. he said it may be the pcm. I am at a loss.
Try to find out what that output is supposed to be. Maybe post in the PCM/Diagnostics section for that answer.
Maybe there's corrosion somewhere. Maybe have the battery and alternator checked again, somewhere else for free. Charge the battery and drive it to an auto parts place.
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