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Diagnosing The GM TPI
We then disconnected the ECM fuse and the ground cable from the battery to erase any codes that were stored in the ECM. Call it overkill, but we did this for 20 minutes, even though a minute would have sufficed. Hey, we wanted to make sure there were no codes stored whatsoever! After running the car for another five minutes, it looked as if we were on the right track—no codes! At this point it was safe to say that the battery’s ground cable may not have been as secure as we thought. View Related Article
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