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Home >> Chevrolet >> 2002 >> TrailBlazer 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.2L >> System Tests >> Malfunction Indicator Lamp Always On >> Description

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.