Join Date: May 1999
Location: SE Florida, USA
Feedback Score: 0 reviews
Do you just want instruction on changing the PCM, or do you want help diagnosing what's wrong?
I'll assume (and yes, I know what that will probably get me) that you want help finding out what's wrong with your truck.
When the OD light flashes it means that the PCM has stored an error code to tell you what it has detected is wrong. If you read the codes you'll have a REALLY good head start on finding the problem. Without the code all you can do is start buying parts and installing them until you get lucky.
Your truck is OBDI. That means you can get a $25 tool to read the codes, or with some instructions that I don't have read the codes with just a paper clip.
Once you have the codes post them here and we can tell you exactly where to look for the problem. The PCM is RARELY the problem.
Former Automatic Transmission Engineer 1988-2007
“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson