The fuel consumption signal tKVA (fuel injection volume) is formed by the engine control unit and made available in a telegram on the CAN bus. The fuel consumption is indicated by linking with the distance signal, depending on the country-specific version, with the consumption per distance unit (e.g. l/100 km), the distance unit per unit of consumption (e.g. km/l) or miles per gallon (e.g. MPG). The indicator is rest to 0 if the vehicle is driven at a speed below a specified speed threshold (10 km/h with hysteresis).
The fuel consumption signal tKVA is not only used for calculating the fuel consumption but also for controlling and therefore indicating the service interval display.