OMP ruined ECU
04-30-10, 03:09 PM
#51
While we are on this subject and since this really hasnt been covered with any detail, can anyone answer...
I understand that if the stepper motor acts as a resistor that it makes since how the ECU gets fried but how is it possible for a fried ECU to fry a good OMP?
I ask because somewhere on the forum a long time poster made a comment that not only a bad omp can fry the ecu but that the fried ecu can also fry the new omp. Is this, IN FACT, correct?
I understand that if the stepper motor acts as a resistor that it makes since how the ECU gets fried but how is it possible for a fried ECU to fry a good OMP?
I ask because somewhere on the forum a long time poster made a comment that not only a bad omp can fry the ecu but that the fried ecu can also fry the new omp. Is this, IN FACT, correct?
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!
02-17-11, 12:57 PM
#52
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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.
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.
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