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Pinpoint Test H: The Speedometer Is Inoperative: Notes

Pinpoint Test H: The Speedometer Is Inoperative 

Normal Operation 

The PCM calculates the vehicle speed from the wheel speed sensor data input from the ABS module and from the tire size and axle ratio configuration in the PCM Vehicle Identification (VID) block. The PCM provides the Instrument Panel Cluster (IPC) with the vehicle speed data over the High Speed Controller Area Network (HS-CAN). The IPC monitors the vehicle speed input and commands the speedometer with a corresponding movement of the pointer.

If the vehicle speed data is missing for 5 seconds or less or if the IPC receives invalid vehicle speed data for 5 seconds or less, the IPC defaults the speedometer to the last setting, based upon the last known good vehicle speed message.

If the IPC does not receive the vehicle speed data from the PCM for more than 5 seconds, the IPC sets DTC U0100:00 in continuous memory and defaults the speedometer to 0 km/h (0 mph). If the vehicle speed data received is deemed invalid by the IPC for 5 seconds or more, the IPC sets DTC U0401:00 and defaults the speedometer to 0 km/h (0 mph).

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

This pinpoint test is intended to diagnose the following: 

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