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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Controls - 4.3L - Troubleshooting & Diagnosis) >> Malfunction Indicator Lamp (MIL) Always On >> Circuit Description

Circuit Description

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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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