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Home >> Ford >> 2013 >> Fiesta Titanium, 4D Hatchback, Standard Trans >> Repair and Diagnosis (Single Page) >> Electrical >> Gauges >> Instrumentation, Message Center & Warning Chimes >> Diagnosis And Testing >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test AX: The Engine Temperature Gauge Is Inoperative >> Normal Operation

Normal Operation

The PCM uses the Engine Coolant Temperature (ECT) sensor to measure the engine coolant temperature. The Instrument Panel Cluster (IPC) receives the engine over-temperature request from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus.

If the engine coolant temperature status message is missing for 5 seconds or less or if the IPC receives an invalid engine temperature status message for 5 seconds or less, the IPC defaults the engine temperature gauge to the last setting (on or off), based upon the last known message received.

If the IPC does not receive the engine coolant temperature status message from the PCM for more than 5 seconds, the IPC sets DTC U0100:00 in continuous memory and defaults the engine over-temperature indicator on and the engine temperature gauge to full hot (H). If the engine coolant temperature status message is deemed invalid by the IPC for 5 seconds or more, the IPC sets DTC U0401:68 and defaults the engine over-temperature warning indicator on and the engine temperature gauge to full hot (H).

NOTE: If DTC U0100:00 sets in the IPC, other observable symptoms may be an inoperative tachometer, speedometer, odometer or the engine over-temperature indicator always on.

This pinpoint test is intended to diagnose the following: 

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