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Pinpoint Test R : The Engine Over-Temperature Warning Indicator Is Never Or Always On: Notes

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

Normal Operation and Fault Conditions 

See Engine Over-Temperature Warning Indicator. Refer to Instrument Panel Cluster (IPC) .

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

If the IPC does not receive the engine coolant temperature and engine overheat mitigation active messages from the PCM for less than 5 seconds, the IPC defaults the engine over-temperature warning indicator to its last state (on or off) based on the last message received.

If the IPC does not receive the engine coolant temperature and engine overheat mitigation active messages from the PCM for 5 seconds or longer, the IPC sets DTC U0100:00 and defaults the engine over-temperature warning indicator on.

Possible Sources 

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