ECM troubleshooting

ELOTAK

MEMBER
SAAB

I have a 1993 Pontiac grand am with quad 4 and 5 speed manual trans. The problem is engine will not start and run. Problem started like this. While pulling the park brake release handle an electrical arc was heard and the engine died. After trouble shooting I found the ECM/F INJ fuse blown. I replaced the fuse to no avail. I found that there was a wiring harness that runs under the dash that was sitting on top the park brake release cable and was rubbing every time it was pulled. Eventually rubbing through the insulation and arcing to ground. So my question is could this have damaged the ecm? I have no check engine light ever now. Even when I try to jump the DLC to check the codes. I hooked a scanner up to check and it could not establish communications with the ecm. Which pins give signals to power up the ecm? I have checked to see if I have the 5v reference voltage to the TPS, MAP sensor, and there is nothing coming out of the ECM. I'm lost and I don't want to just go out and spend all that money on a new ecm if it is only the ecm isn't receiving it's signal. Thanks Ed

3 Replies

JEFTFIELDS

MEMBER

Did the wire git cut all the though, it sonds like maybe a wire got cut on the cable, and is not completing the circuit for the ecm.

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Saturday, January 27th, 2007 AT 4:27 PM

ELOTAK

MEMBER

Well the wires didn't get burned all the way through but it did melt about half way through so I patched in an equivelent gage of wire and ran a continuity check through them after completion to make sure they were good and they were. So I'm sure that's not it.

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Saturday, January 27th, 2007 AT 9:09 PM

RAYRAYZBABE

MEMBER

I have a 1988 Thunderbird(71,000 miles), 6 cyl, that mt father just purchaced for me and it runs excellent except, that gas gauge doesn't seem to be working. And either do the warning lights in the dash board for anything. The gauge shows that I am in the red zone, almost to be out of gas, and it seems the more gas that I put in there, I still am in the red.I have checked the fuese and they are all goood. What else can I do or check to get them all to work?I do not want to take my car into the shop for repair because they are ALL to EXPENSIVE! I sthere anything that I can do to repair this on my own?

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Wednesday, March 7th, 2007 AT 2:22 AM