Best and cheapest way is to go to a salvage yard and buy and install a "good" used one and run the vehicle for 5-10 minutes to see if your problems have gone away.
The alternate solution is to go to a mechanic an pay $100-150 for them to hook up your ecu through the diagnostic connector and run tests to check
all the functions of the ecu.
Depending on your problem, it could cost considerably more for a thorough
diagnosis-depending on what type mechanic you visit.
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Pull the ECU out and remove the cover and physically look to see if i can see a burn mark on the board. Use a magnifying glass. Occasionally i will find a very obvious burned board. Not common but it does happen.
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