G’day everyone, I actually haven’t been on here in a while, too many reliable klms!
I purchased a 2002 3.4l GXL auto for spare parts for my 2000 model 3.4l auto Grande. This car was already a spare parts car for someone else so is not 100% complete.
Even though the front of the engine isn’t complete, missing the clutch fan, alternator and serpentine belt etc, it would still start and drive facilitating moving it around.
However on the first day I went to put a battery in it and didn’t notice someone had replaced the negative cable with a red insulated cable (Why!!!?). I initially reversed the polarity on the battery, thinking red is positive. The headlights came on, as did the wipers. I simply thought they had been left on so proceeded to try starting it. After it wouldn’t, I looked at the battery and saw my error.
I know the engine did run as the tow truck bloke drove it into my driveway. Now it won’t. I have checked all the fuses and relays I could find relating to the EFI or ignition I could find. I can only assume now (unless someone knows different?), that I have fried the ECU? I removed it and took it to my 2000 model, though it wouldn’t start it as I am guessing the immobiliser stopped it? Or it is indeed fried. How hard is it to reprogramme an ECU to another car? Can it be done with an OBD2? Or does anyone have any other suggestions on what could be the issue now, other than the ECU? I would have thought it would have been protected against a polarity mishap?
Cheers
Adrian
I purchased a 2002 3.4l GXL auto for spare parts for my 2000 model 3.4l auto Grande. This car was already a spare parts car for someone else so is not 100% complete.
Even though the front of the engine isn’t complete, missing the clutch fan, alternator and serpentine belt etc, it would still start and drive facilitating moving it around.
However on the first day I went to put a battery in it and didn’t notice someone had replaced the negative cable with a red insulated cable (Why!!!?). I initially reversed the polarity on the battery, thinking red is positive. The headlights came on, as did the wipers. I simply thought they had been left on so proceeded to try starting it. After it wouldn’t, I looked at the battery and saw my error.
I know the engine did run as the tow truck bloke drove it into my driveway. Now it won’t. I have checked all the fuses and relays I could find relating to the EFI or ignition I could find. I can only assume now (unless someone knows different?), that I have fried the ECU? I removed it and took it to my 2000 model, though it wouldn’t start it as I am guessing the immobiliser stopped it? Or it is indeed fried. How hard is it to reprogramme an ECU to another car? Can it be done with an OBD2? Or does anyone have any other suggestions on what could be the issue now, other than the ECU? I would have thought it would have been protected against a polarity mishap?
Cheers
Adrian
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