Pontiac Problems? Ask a Mechanic for Answers ASAP
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The PCM grounds the brown/white wire at on pin 46 to turn on check engine light. So start by unplugging PCM and grounding wire to see if light comes on, if so replace PCM. If not, run new wire between PCM and instrument cluster. Here is a wiring diagram of circuit to help with testing, let me know if you have questions. Thanks.