|
| Search | Car Forums | Gallery | Articles | Helper | Air Dried Fresh Beef Dog Food | IgorSushko.com | Corporate |
|
#1
08-22-2005, 10:54 PM
|
|||
|
|||
Whats Killing My PCM's?
I have a 94 Bonneville SSE, 120K miles. Since I purchased the car back in 1998, I have had to replace the PCM 4 times. The PCM now seems to last a year before something odd begins to happen. This last round, I was getting crank-no-start when the car had sat for more than a few hours. After repeated start attempts the car would start. Codes that would keep showing were PassKey II fuel enable circuit, PassKey II signal out of range, and MAF failure. I replaced the VATS module, Key cylinder, ignition key, replaced the MAF sensor and the codes continued to show. After exhausting troubleshooting the trouble codes, I had the PCM module replaced and bingo.. all problems and codes are gone. So my observation is "something" is causing the PCM to go bad. The million dollar question is, what could that "something" be? Could I have a ground problem? Visual inspection of the 3 cable harness wires and connectors don't show wear or insulation problems. But a new PCM every year is costing me to much! Has anyone experienced a problem like this? I sure can use your advise.
Thanks Steve 
|
|
#2
08-27-2005, 11:36 PM
|
|||
|
|||
No Ideas??
Seems the various issue's I have with my 94 Bonnie must be unique.. I seem to encounter problems that stump the dealer shops. My car cant be the only one to experience these problems... Does anyone know where I cant get a hold of a list ground locations to check for my model year?
Thanks all....
|
|
#3
08-28-2005, 07:10 AM
|
||||
|
||||
|
Visual inspection of a connection really doesn't tell you anything.
You probally have a high resistance ground or power feed or just some bad connections at the PCM. Do a voltage drop test on the ground circuits (resistance checks don't tell you anything) a voltage drop more than .2 volts indicates a bad connection. Check the terminal tension of the PCM connectors, bet you will find some loose terminals. Next thing is are you using a Delco PCM or an aftermarket PCM..if you are using aftermarket, they are JUNK IMHO.
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
|
|
#4
08-28-2005, 11:09 AM
|
|||
|
|||
|
Thank for the info. I am using a genuine GM Delco PCM purchased from the dealer. All connections on the PCM harness are tight and show no signs of wear or insulation damge.
I plan on checking the various ground connectrion, but I need to find out where they are located on my model year. Steve
|
|
 |
POST REPLY TO THIS THREAD |
 |
|
|
