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Pinpoint Test F: The Tachometer Is Inoperative: Notes

Pinpoint Test F: The Tachometer Is Inoperative 

Normal Operation 

The PCM uses the Crankshaft Position (CKP) sensor to measure the engine rpm. The PCM sends the Instrument Panel Cluster (IPC) the data over the High Speed Controller Area Network (HS-CAN) to command the tachometer.

The base (Edge only) and optional IPC tachometers appear differently but function essentially the same. The base IPC uses an analog gauge. The optional IPC uses a digital display that provides a 6, 000 rpm bar graph or a simulated 7, 000 rpm analog gauge display depending on the display mode.

If the IPC does not receive the engine rpm data from the PCM for 5 seconds or less, the IPC defaults the tachometer to the last setting, based upon the last known good rpm message. If the IPC does not receive the engine rpm data from the PCM for more than 5 seconds, the IPC sets DTC U0100:00 in continuous memory and defaults the tachometer to 0 rpm.

NOTE: If DTC U0100:00 sets 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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