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Home >> Cadillac >> 2003 >> DeVille Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> System Tests >> Malfunction Indicator Lamp Always On >> Description
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Malfunction Indicator Lamp Always On: Description

Ignition voltage is supplied 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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