I replaced the ecm and now I can't get the overdrive off light to shut off. This keeps the overdrive off all the time so i'm driving with higher rpms. Any idea what this could be?

 

Hi could you read out any trouble codes? 94 has a stand alone transmission control unit am I right?

 

I have no trouble codes. Could it be the wrong computer? I call dealer with Vin and got the computer they told me to but it had a different number on it then the one I took out.

 

It can be a problem, but there are several compatible part numbers. If any small thing is changed in software or even hardware component supplier, that has to be a different part number for identification purposes. The only thing I'm not sure is that when was the transmission control function integrated to the ECM. As far as I know in 96, so it would mean that you have to have a stand alone TCM and it can be the trouble source. What was the original failure, that made you to change the ecm. Can you put it back for a test?

 

The coil shorted out and fried the computer. It started smoking. Can't reuse it.