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Home >> Lincoln >> 2012 >> MKZ Hybrid >> Repair and Diagnosis (Single Page) >> Electrical >> Gauges >> Information Center - Instrumentation, Message Center, And Warning Chimes >> Diagnosis And Testing >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test K: The EV Gauge Is Inoperative (Hybrid) >> Normal Operation

Normal Operation

The EV gauge is an extension of the tachometer display. When the vehicle shifts into electric vehicle mode or the ignition is in the RUN position with the engine off, the EV gauge replaces the tachometer display in the Instrument Panel Cluster (IPC). The IPC receives the EV gauge data from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus, and engages and commands the EV gauge according to the data received. The EV gauge is only available in the enlighten display mode.

For the IPC to switch to the EV gauge, the PCM first stops providing the message indicating that the vehicle is in engine active mode and begins sending electric power flow data to the IPC.

If the electric motor data is invalid for 5 seconds or less or if the IPC does not receive the electric motor data for 5 seconds or less, the IPC defaults the EV gauge to the last setting, based upon the last known good electric motor message. If the IPC does not receive the electric motor data from the PCM for more than 5 seconds, the IPC sets DTC U0100:00 in continuous memory and defaults the EV gauge to 0 rpm. If the electric motor data is deemed invalid by the IPC for 5 seconds or more, the IPC sets DTC U0401:68 and defaults the EV gauge to 0.

NOTE: If DTC U0100:00 is set in the IPC, other observable symptoms may be an inoperative speedometer, temperature gauge or odometer.

This pinpoint test is intended to diagnose the following: 

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