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Diagnosing The GM TPI
We figured the easiest code to tackle first would be the code 51 (faulty or improperly installed ECM prom) by removing and replacing the ECM prom. We removed the computer from under the dash, loosened two bolts, and removed the plate. Inside there are two clips (arrows) that you can push to remove the prom. Once removed, we simply blew air on the connectors and firmly placed it back into place. Be careful, too much force can break the circuits on the board. View Related Article
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