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ECM To OBDII Connection

lstexan

lstexan

New member
I recently bought a 98 GTP and the engine is running really rough, the SES light comes on and flashes sometimes. I plug in my OBDII scanner but it will not connect to the cars computer. The scanner will not even power up.
I have checked the fuse in the glove box, it's okay, I recently bought a new ECM, still not connecting.

Any other places to check?

Thanks for your help.
 


yes there is power at the obd port on a grand prix, mine has it anyways along with 2 grounds. i think it is tied into the cig lighter fuse
 
No power to run the scan tool. They do not have that. That is why you have to run a power wire to an aeroforce etc.
 
I was told that the plugs and wires were most likely the cause for it running rough at idle, it smooths out at higher rpm. I will replace them.

The power to the ecm port being tid into the cig lighter fuse is a possibility because that fuse blows. I will have to follow up on why that happens.
Thanks for the advice and I'll get back.
 


It was the cig lighter, it shorted out somehow. I have disconnected it, no smokers in mt car - ha ha, now I can connect to car's computer. I got a PO 0303 code - #3 cylinder misfire.
Thanks for all the great advice.
 


lstexan said:
It was the cig lighter, it shorted out somehow. I have disconnected it, no smokers in mt car - ha ha, now I can connect to car's computer. I got a PO 0303 code - #3 cylinder misfire.
Thanks for all the great advice.
Click to expand...

i thought it was linked :cool:
 
01GTP said:
Grand prix's do not have power at the obdII port. Check and see if your scanner has a dead battery in it.
Click to expand...

My GM Tech II scanner gets its power from the OBD port on all cars, my GP too... I guess you are refering to aftermarket type scanners.
 
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