Speedometer Module: Description and Operation

Electronic Instrument Cluster:

Instrument Cluster Legend:

The vehicle speed sensor (mounted in the transaxle) sends a speed signal to the instrument cluster. The frequency of this signal is related to speed. The speed signal input is processed by the microprocessor and is then used to operate the digital speed and odometers display.

Inputs to the electronic control module (ECM) and the cruise control module are also obtained from this processed speed signal.

The odometer display is a multifunction display which includes both total odometer and trip odometer indicators. Both are switch selectable and utilize the same display.

The information stored in the total odometer is retained in a removable "non-volatile memory" which MUST stay with the car. If the odometer is tampered with, then the odometer shall display "odoerr" during power up sequence. If the odometer is defective, then it will read "odoerr" at all times.