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I've replaced the PCM, when I did the new one stop working too,what I wanted to know could the voltage regulator or the alternator be blowing my PCM out? I've been having problems since they rewired my alternator and put in the new alternator, the wires had to be replaced because they had burned. My car stopped running and my check engine light would not come on along with other lights, when I replaced the PCM the check engine lights came on and the car started.
Answer -
What MAKE-YEAR-MODEL-ENGINE SIZE do you have ?.
If you have a dead short in one or more of the vehicles sensor inputs that goes into the PCM and you do NOT fix the short FIRST, Of course the new PCM will be destroyed.
It's like if you have a blown fuse in the fuse panel and you do not fix the problem of what caused the fuse to blow and you only just install a new fuse. Guees what will happen.
You need to check EVERY circuit that goes into and out of the PCM to locate and fix the short BEFORE you install a new PCM or you will just keep blowing PCM'S.
I might have a book that will show me how your alternator is wired but I need your vehicles information first.
Think back. What was done on the vehicle prior to having this problem and concentrate your search for a short or incorrect wiring in this area.
Thank You,It's a 1995 Eagle Talon ESI 2.0 non-turbo, the alternator and wires replaced 3yrs ago, when I checked the plug to the MAP sensors with the light tester my engine fan comes on and that doesn't seem right because the MAP sensor deals with the fuel delivery, am I correct?
Answer -
OH MY GOD.!. You NEVER EVER use a 12 volt test light to check anything that is computer related to your electronics.
Your electronics runs on a 5 volt system, NOT a 12 volt system.
If you have been probing sensors and related components with a 12 volt test light, Know wonder you are destroying the PCM'S.
You are going to have to procur a manufacturers service manual and electrical schematic and check EACH AND EVERY electronic component via the procedures required within the service manuals.
With the PCM now BLOWN because of using the incorrect testing procedures, NOTHING is going to work correctly.
I really hate to tell you this, But this repair is going to have to be made by a professional automotive technician and you MUST tell him that you were using a 12 volt test light to test the sensor circuits.
This is going to be a Very very very expensive parts and time consuming repair cost.
Usually on some model vehicles when an electronic component fault occurs the PCM has a built in circuit that turns on the cooling fans as part of the diagnostic procedure for the technician.
I used the test light after the PCM was already out, when my car had quit running a mechanic came out and told me that it was either my relays or the PCM, so I started with the relays first, car still would not start, so then I put the PCM in, the car started, the next day I went out and I was back where I had started not running and no check engine light.
autohelp
AnswerYour mechanic should know better than to tell you that you ONLY have a RELAY or PCM problem.
There are hundreds of low voltage circuits within the PCM and naturally you destroyed one because the car would not start. Then when you used your test light, You destroyed another one.
You will need to have a professional to fix this major problem.
autohelp
