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Pinpoint Test G : The Analog Tachometer Is Inoperative: Notes

Normal Operation and Fault Conditions 

See Tachometer. Refer to Instrument Panel Cluster (IPC) .

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

If the IPC does not receive the engine speed data from the PCM for longer than 5 seconds, the IPC sets DTC U0100:00 in continuous memory and defaults the tachometer to 0 Revolutions Per Minute (RPM).

If the IPC receives invalid engine speed data from the PCM for longer than 5 seconds, the IPC defaults the tachometer to 0 Revolutions Per Minute (RPM).

Possible Sources 

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