GF54.30-P-3018GZ Display Fuel Quantity, Function

GF54.30-P-3018GZ Display Fuel Quantity, Function

Component Identification:

Function
The fuel level and reserve gage (A1p2) is a 39-segment LCD bar graph indicator. Switching on and off of the fuel level and reserve gage (A1p2) takes place via instrument cluster (A1).
The display readings are shown immediately after "Terminal 15 ON"; the display run-up is dampened, but the run-down is not. A hysteresis is implemented to prevent segment jittering of readings near the segment limits.

Fuel level gage sensor
The left fuel level sensor (B4/1) and right fuel level sensor (B4/2) are planned for the fuel level measurement. The instrument cluster (A1) registers this percentage from the interior compartment CAN and uses this information as the basis for controlling the fuel level and low fuel display (A1p2) as well as the low fuel warning lamp (A1e4) as required.

Fuel level display
If the EIS [EZS] control unit (N73) is in the position "circuit 15 ON" the current tank capacity is displayed in the fuel level and reserve indicator (A1p2).
During refueling when the EIS [EZS] control unit (N73) is in position "circuit 15 ON", refueling is only detected (updating of the display) as of a replenishment quantity of at least 9 l. Once "circuit 15 ON" is switched on again the display is updated. There is always a delay before the display is updated. This inhibits fluctuations in the display, e.g. due to cornering.

Reserve range
The reserve range extends from "0" to "Reserve". This corresponds to a quantity of 0 to approx. 9 l.
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 period to prevent the lamp flickering.

The system responds to malfunctions by moving the needle in the fuel level and reserve display (A1p2) to "0." The fuel reserve warning lamp (A1e4) does not come on.