John-

The link I posted above explains the details on how the stepper burns the ECU output stage.

BAsically at each step on the stepper motor, there is a specified resistance, therefore a certain amount of current is expected in the circuit. The ECU output stage is designed for this amount of current.

If the MOP fails in a mode where the insolation/isolation BETWEEN steps is compromised, then the resistance becomes lower as current flow through both stepper circuits at once. The stepper draws more current than the ECU circuit is designed to handle. Parts get hot and burn up. You can see the burned parts on the circuit board. Pictures of the burned parts on that thread look exactly like the burned parts on my circuit board.

There has been some success fixing these ECU's but that is beyond my soldering skills.

I do not think that the burned ECU is likely to burn the MOP, as it's current capacity is smoked. Literally.

Follow that link and use the testing protocol to test and verify the quality of the MOP before hooking it to your ECU. That is what I did and I was successful at fixing the problem first time.

Good Luck!

 

Jackhild59,

I'm not sure how I missed your response for so long. THANKS!

I have not yet resolved this issue and will be getting back to it this week however I did inspect the ECU that I currently have installed and the one I removed last year and they both appear to be free of that burned area.