Daily mileage counter
The microprocessor in the instrument cluster calculates the route data based on the wheel speed signals transmitted from the anti-lock brake system (ABS) module via the high-speed CAN bus. The CJB serves as a gateway and transmits the wheel speed signal to the instrument cluster via the medium-speed CAN bus.
The trip meter shows the distance traveled since the trip meter was last reset. The trip meter can be reset by pressing and holding the trip computer button for more than 1 second. The trip meter can display up to 999,999 miles or kilometers. When this value is exceeded, the trip meter starts counting again from 0 miles or kilometers.
Route data is stored in the instrument cluster's RAM and will be lost if the battery is disconnected.
Average fuel consumption
The instrument cluster receives two fuel tank level readings via the medium speed CAN bus via the CJB. The instrument cluster calculates an average value of the amount of fuel used in the tank based on the two signals. Every 200 m of vehicle travel, the instrument cluster recalculates this value to determine how much fuel has been used. This value is then averaged over the last 50 km of travel and displayed in the trip computer.
The distance travelled signal is initiated in the ABS module and received by the instrument cluster, passing through the CJB on the medium speed CAN bus.
Remaining distance to refueling
The distance to refuel value is calculated using the average fuel consumption value (see above) and the fuel level value in the tank. By dividing the fuel level value in the tank by the average fuel consumption, the instrument cluster can calculate the distance the car can travel with the current amount of fuel in the tank before refueling is necessary.
Average speed
The average speed signal is calculated using the vehicle speed signal supplied by the CJB via the average speed CAN bus. This signal is initiated in the ABS module and is the average of the speed signals from the four wheels. This value is divided by the time since the trip computer was last reset to calculate the average vehicle speed.
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