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Pinpoint Test U: The Mil Is Never/Always On: Notes

Pinpoint Test U: The Malfunction Indicator Lamp (MIL) Is Never/Always On 

Normal Operation 

The Malfunction Indicator Lamp (MIL) is controlled by the Instrument Panel Cluster (IPC) using data sent from the PCM over the High Speed Controller Area Network (HS-CAN).

If the MIL status message is missing or invalid for less than 5 seconds, the IPC defaults the MIL to its last state (on or off) based upon the last known good message received. If the MIL status message is missing for 5 seconds or longer, the IPC sets DTC U0100:00 in continuous memory and defaults the MIL on.

NOTE: If DTC U0100:00 sets in the IPC, other observable symptoms may be an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following: 

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