GF54.30-D-3018HH Display Fuel Quantity, Function
GF54.30-D-3018HH Display fuel quantity, function
- with CODE (JK3) High-end instrument cluster with speedometer in km
General
The fuel level and reserve indicator (A1p2) is located bottom right in the tachometer (A1p5) of the instrument cluster (A1) and is an analog indicator. The fuel level and reserve indicator is driven by a stepper motor. If the "circuit 15 ON" status exists, the pointer of the fuel level and reserve indicator is run up slowly to the respective value.
Updating of the fuel level and reserve indicator for "circuit 15 OFF"
If the vehicle is refueled with "circuit 15 OFF", the fuel level and reserve indicator is updated when the "circuit 15 ON" state exists again, provided that approx. 3 liters of fuel have been added.
Updating of the fuel level and reserve indicator for "circuit 15 ON"
With "circuit 15 ON", the current tank content is displayed on the fuel level and reserve indicator.
If the vehicle is refueled with "circuit 15 ON", the fuel level and reserve indicator is not updated until approx. 7 liters of fuel have been added.
The fuel level and reserve indicator is always updated after a delay and the pointer of the fuel level and reserve indicator always runs up to the new fuel value slowly. This ensures that fluctuations in the fuel level resulting from vehicle movement are not shown on the fuel level and reserve indicator.
Networking and information flow
Networking of components:
- With engine 642 or with engine 646, the fuel level sensor of the fuel pump with fuel level sensor (M3/5) is read in and evaluated by the SAM control unit (N10).
- With engine 272, the fuel level sensor of the fuel pump with fuel level sensor (M3/6) is read in and evaluated by the SAM control unit.
- The SAM control unit places the signals on the Controller Area Network bus class B (interior) (CAN-B).
- The instrument cluster reads in the signals from CAN-B.
- The instrument cluster evaluates the values read in from the fuel level sensor using a tank characteristic. The fuel level and reserve indicator and, if necessary, the fuel reserve indicator lamp (A1e38) are then actuated accordingly on the basis of these values (which are calculated according to the type of tank used).
Reserve range
If the reserve range is reached, the fuel reserve indicator lamp lights up yellow. The lamp is triggered with a delay period to prevent the lamp flickering. If the fuel level is less than 12.5 % of the tank capacity, the fuel reserve indicator lamp is actuated.
Jammed fuel tank sensor recognition
The jammed fuel tank sensor recognition function becomes active after the vehicle has covered a distance of s > 160 km. Fuel tank sensor tight installation is detected when the sensor resistance value does not change by at least a defined sensor resistance value within a certain distance.
If this state occurs, an erroneous bit is set for the fuel level sensor in the fault memory of the instrument cluster. The erroneous bit is deleted again if the required change in the resistance value of the fuel level sensor has occurred.
If a fault occurs, the pointer of the fuel level and reserve indicator moves to the beginning of the scale. The fuel reserve indicator lamp is not actuated.
If the values displayed in the fuel level and reserve indicator are implausible, the tank evaluation algorithm can be initialized by the instrument cluster by causing an open circuit in circuit 30.