Instruments - Description & Operation: Description: Speedometer

The speedometer is electronically operated and contains an LCD. Each model has a maximum scale indication of 136 mph (220 km/h).

The speedometer is driven by CAN messages from the ABS ECU. The messages are generated by an ABS wheel speed sensor which produces pulses as the reluctor rotates. The instrument pack microprocessor processes the incoming CAN message from the ABS ECU and converts it into electrical signals for speedometer operation.

If the CAN message fails for more than 64ms the microprocessor will terminate speedometer operation and record a fault flag. The recorded fault can be accessed using T4.