Fuel Consumption, Function
Fuel Consumption, Function
The trip computer provides displays of the average fuel consumption rate:
- "SINCE START" (short-distance memory) and
- "SINCE RESET" (long-distance memory)
Depending on the unit setting (kilometers/miles) and the national variant coding of the instrument cluster (A1) the fuel consumption is displayed in:
- litres per 100 kilometers (ECE),
- miles per gallon (USA) or
- kilometers per litre (Japan).
Fuel consumption "SINCE START" (short distance memory) function
- Activate the "SINCE START" display mask using the system select pushbutton (S110s3) and the scroll forward/back pushbutton (S110s1) on the multifunction steering wheel.
- The display shows the data calculated since the last reset (RESET) of the transient memory
- The distance traveled "SINCE START" appears in the leftside multifunction display panel (A1p13).
- Additional information also appears in the right-side multifunction display panel (A1p15):
- the average travel speed
- the elapsed time since the start of the journey
- the average fuel consumption
Fuel consumption "SINCE RESET" (long-distance memory), function
- Activate the "SINCE RESET" display mask using the system select pushbutton (S110s3) and the scroll forward/back pushbutton (S110s1) on the multifunction steering wheel. The display is based on the data registered and calculated since the last reset (RESET) of the extended memory
- The travel distance "SINCE RESET" appears in the left-side multifunction display panel (A1p13).
- Additional information also appears in the right-side multifunction display panel (A1p15):
- the average travel speed
- the time since the reset
- the average fuel consumption
The trip computer calculates the average fuel consumption figures from the mileage traveled and the consumption signal.
NOTE: The fuel consumption signal uses information on the amount of fuel injected within a specific period.
The instrument cluster (A1) receives this data in the following way:
- The fuel consumption signal is generated by the ME control unit (N3/10) and transmitted to the engine compartment CAN in the form of a message.
- The mileage traveled is calculated from the four wheel speeds. The signals come from the SBC control unit (A7/3n1) via the control unit for ESP, PML and BAS (N47-5) and the engine compartment CAN.
NOTE: After resetting there is not sufficient data material for correct calculation of the consumption.
As a transitional solution for this period, the display shows a calculated figure based on the individual vehicle's fuel consumption; this display varies according to the unit setting (miles/kilometers) and the national version code entered in the instrument cluster (A1).
Actual current fuel consumption may vary from the figure indicated.
The maximum available display is 401/100 km. Displays using miles per gallon or kilometers per litre revert to zero.
It is completely normal for the "SINCE START" display (short-distance memory) and "SINCE RESET" display (long-distance memory) to show different values, since the two displays are based on different sets of data. The "SINCE START" display (short-distance memory) reacts much more sensitively to the current driving situation than the "SINCE RESET" display (long-distance memory).