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try runnign the ecm diagnostic. im not sure exactly how by my memory, but its by jumping 2 terminals in the diagnostic conenctor. i know you can find how on the web. The ecm will flash the "check engine" light to correspond with any codes found, but heres the main thing. it should first flash the code 12 to show it is working properly. if you run the diagnostic and get no code 12, there thats a pretty major issue, and one cause could be a bad ecm.
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