How to Diagnose Your TPI
Without checking the basics, even the most exotic scan tool can lead you astray. Incorrectly advised that the base timing was set correctly, Sjoberg said, "The car threw me a curve ball. With a Code 42 showing, the scanner told me to check for 6 volts at the B7 connector on the car's ECM. It read 9 volts. I could have easily misdiagnosed the problem as a faulty ECM, a $250 (remanufactured) mistake that would not have solved the problem. It all goes back to confirming the three basics: minimum idle speed, TPS voltage, and base ignition timing before you replace any parts." View Related Article
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