The instrument cluster receives a vehicle speed input from the vehicle speed sensor (VSS) over the class 2 line from the PCM. This signal is used in order to drive the speedometer and the odometer of the instrument cluster. The season odometer displays the total accumulated kilometers (miles) of the vehicle and stores the value permanently in the electronically erasable programmable read only memory (EEPROM) of the instrument cluster. The trip odometer displays the accumulated kilometers (miles) to the tenths of a kilometer (mile) since the last reset and stores the value in the keep alive memory (KAM) of the instrument cluster.

The instrument cluster continuously performs an internal test on the operation of the speedometer and the odometer in order to detect an internal fault in the speedometer and/or the odometer.

Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions, i.e.RPM, load, vehicle speed, temperature, etc. This will isolate when the DTC failed.

Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.