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Pinpoint Test V : The Mil Is Never-Always On: Notes

Pinpoint Test V: The MIL Is Never-Always On 

Diagnostic Overview 

Diagnostics in this service information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Service Information for information about these practices.

Normal Operation and Fault Conditions 

REFER to Malfunction Indicator Lamp (MIL) in Instrument Panel Cluster (IPC) .

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

If the engine MIL request 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 engine MIL request message is missing for 5 seconds or longer, the IPC sets DTC U0100:00 in continuous memory and defaults the MIL on.

Possible Sources 

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