Fuel quantity display function - GF54.30-P-3018S
Model 215, 220
Networking of components
Networking:
- The fuel level sensor (B4) changes its resistance according to the fuel level in the tank. The fuller the tank, the lower the resistance.
- The resistance of the fuel level sensor (B4) is read in by the rear SAM control unit (N10/8).
- The rear SAM control unit (N10/8) converts the resistance values from the fuel level sensor (B4) into a percentage (a full tank corresponds to 100 %).
- This percentage is transferred by the rear SAM control unit (N10/8) to the interior compartment CAN.
- The instrument cluster (A1) reads in this percentage from the interior compartment CAN and uses this information as the basis for controlling the fuel level and low fuel gauge (A1p2) as well as the fuel reserve indicator lamp (A1e4) as required.
- The fuel level and reserve gauge (A1p2) is controlled by a stepper motor.
Display of fuel level, valid up to 31.8.02:
- If "Term. 15" is ON, the current tank level is indicated in the fuel level and reserve gauge (A1p2).
- If the tank is filled while "Term. 15" is ON, detection of refilling (updating of the display) only takes place after a refill quantity of at least 5 liters.
- The display is updated as soon as the ignition is switched on again. There is always a delay before the display is updated. This suppresses fluctuations in the display, e.g. due to cornering.
Reserve range, valid up to 31.8.02:
- The reserve range extends from "0" to "R". This corresponds to a quantity of 0 to approx. 12 liters with the standard tank and of 0 to approx. 10 liters with the ski bag version.
- When the reserve level is reached, the fuel reserve indicator lamp (A1e4) lights up in yellow when the engine is running. The lamp is triggered with a delay to prevent the lamp flickering.
Display of fuel level, valid as of 01.9.02:
- When "Term. 15" is ON, the indicator moves to the display reading within 1 second. The time constant is then increased to 8 seconds.
- When the engine starts, a time constant of 0.25 seconds is selected for 4 seconds in order to obtain a display reading with the full on-board voltage.
- Once these 4 seconds have elapsed or the vehicle moves, the time constant for display updating is set to 30 seconds.
- If the tank is filled while "Term. 15" is ON, detection of refilling (updating of the display) only takes place after a refill quantity of at least 5 liters.
Reserve range, valid as of 01.9.02:
- The reserve range extends from "0" to "R". This corresponds to a quantity of 0 to approx. 11 liters with the standard tank and of 0 to approx. 10 liters with the ski bag version.
- When the reserve level is reached, the fuel reserve indicator lamp (A1e4) lights up in yellow when the engine is running. The lamp is triggered with a delay to prevent the lamp flickering.
Tank type code, valid up to 31.8.02:
Coding for the tank type is not necessary. The fuel level sensors (B4) are designed so that a certain resistance corresponds to the same percentage for both tank variants.
Tank type code, valid as of 01.9.02:
Two characteristics which are set by means of the variant coding are available for determining the display reading. The upper tank value and tank reserve value can be selected independently of the respective tank characteristic.
Fuel level sensor seizure detection, valid as of 01.9.02
If seizure of the fuel level sensor is detected, this is stored in the diagnostic trouble code memory and can be read out using the STAR DIAGNOSIS TOOL.
In the case of a fault, the pointer of the fuel level and reserve gauge (A1p2) moves to the left stop. The fuel reserve indicator lamp (A1e4) does not light up. This information is valid for all vehicles.
| Instrument cluster (IC), location / task | GF54.30-P-3039S |