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Home >> GMC >> 2002 >> Jimmy 2D Utility, Part Time, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 4.3L >> System Tests >> Malfunction Indicator Lamp Always On >> Description
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Malfunction Indicator Lamp Always On: Description

Battery positive voltage is supplied directly to the Malfunction Indicator Lamp (MIL). The Powertrain Control Module (PCM) turns the MIL ON by grounding the MIL control circuit.

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