I've got a 97 Olds Aurora that has a check engine light on. Code is P1376, which decodes to "PCM Ground Circuit Fault". Trouble is, the solution calls for using a Tech 2 scantool, which I don't have. Based on reading the troubleshooting flow chart, it calls for checking the wiring harness at certain spots and reading the voltage. Based on reading this, I either have a PCM fault, a wiring harness fault, or a ground connection fault. Since the car has not been (severly) wrecked that I can see, I'm betting the wiring harness is OK, and I'm praying the PCM is OK. That leaves the quite possible chance that a ground connection is poor. Anyone out there with access to the schematics or wiring diagrams that can tell me where to look for a PCM ground connection to the body or engine? I'd like to check all the grounds and see if I can fix this before I have to shell out large $$$$ and take it to the dealer. MD Emissions won't pass the car with a check engine light on :mad:

You won't really need a Tech 2, a good scanner with a live data stream should do. you definately want to follw the flow chart. That will make sure you don't replace parts that don't need to be replaced.

Jay, yeah I understand that, but what I'm looking to do is find where the ground connections terminate so I can verify there is a good ground at the end. Once that's done, if I still have a +1 or more volt reading on the harness, then I'll start looking at pinched wires/bad connectors. I'm betting the connection at the end is the fault, but I dont' have the charts to see where they terminate.

Maybe hit a shop in your area that will copy a wiring diagram form Alldata.

I can print you a wiring diagram, but Im in waldorf.