Test H: Incorrect Speedometer Indication

PINPOINT TEST H: INCORRECT SPEEDOMETER INDICATION

Normal Operation
The PCM receives the wheel speed sensor data from the output shaft speed sensor (OSS). The PCM provides the instrument cluster (IC) with the vehicle speed sensor (VSS) signal over the high speed controller area network (HS-CAN) communication bus. The instrument cluster (IC) monitors the VSS input from the PCM and commands the speedometer with a corresponding movement of the pointer. Factors that could potentially affect the accuracy of the speedometer are configurable items such as tire size.

If the vehicle speed data is missing or invalid for 5 seconds or less, the instrument cluster (IC) defaults the speedometer to the last setting, based upon the last known good vehicle speed message. If the instrument cluster (IC) does not receive the vehicle speed data from the PCM for more than 5 seconds, the instrument cluster (IC) sets DTC U0101 in continuous memory and defaults the speedometer to 0 km/h (0 mph). If the vehicle speed data received is deemed invalid by the instrument cluster (IC) for 5 seconds or longer, the instrument cluster (IC) sets DTC U2023 and defaults the speedometer to 0 km/h (0 mph).

NOTE: If DTC U0101 is set in the instrument cluster (IC), other observable symptoms may be an inoperative tachometer, temperature gauge or odometer.

This pinpoint test is intended to diagnose the following:
- Tire size
- PCM
- Instrument cluster (IC)

H1-H6:

H7: