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Malfunction Indicator Light Always On: Description

WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

Ignition voltage is supplied 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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