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Home >> Chevrolet >> 2003 >> Monte Carlo SS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> System Tests >> Mil Always On >> Description
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Mil Always On: Description

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

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