PCM vs. Alternator
Thread Starter
Teching In
Joined: Aug 2011
Posts: 17
Likes: 0
From: Rockbridge,Va
PCM vs. Alternator thought a i had a bad alternator but the wire from the pcm was burned off at the alternator . Dont why. So I repaired the wire and my tach stopped workin.I hooked my code reader up and it could not see my computer. So I cut the wire at the repair and tach works and code reader see my computer.
Any thoughts on this ? I coud not find more damage on the wire.Maybe a bad PCM? How do I test it?
Car does not charge with the wire disconnected
Also if I get a PCM out of a junk yard , how do you get it to work with my vin.?
Alot questions any help would be greatly appreciated
.....Shawn
Any thoughts on this ? I coud not find more damage on the wire.Maybe a bad PCM? How do I test it?
Car does not charge with the wire disconnected
Also if I get a PCM out of a junk yard , how do you get it to work with my vin.?
Alot questions any help would be greatly appreciated
.....Shawn
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
You have to reprogram the VIN in the computer with a program like HPTuners. Otherwise, I put a resistor on a 12v+ IGN wire and knock the voltage down to 5 or 6v and run that straight into the alt to "turn it on" and be done.
Without knowing more I would say that something is wrong inside your alternator, - the part that handles the PCM control over the voltage regulator.
I could not tell you more though because I don't mess with these types of newer alternator designs.
I could not tell you more though because I don't mess with these types of newer alternator designs.
Was it really burned? If it's getting really hot that cable might not work anymore. Having high resistance on that wire will cause it to go hotter then normal. Pm me if u have questions.
