Fuel Gauge

When the fuel tank level is low ("E"), the resistance value of the gauge sensor is 270 Ohms for petrol and diesel engines. As the fuel level increases, the resistance of the sensor decreases. When the fuel tank is full, the resistance value of the sensor for petrol engines is 19 Ohms and for diesel engines 25.8 Ohms. When the fuel gauge sensors resistance value increases to 175 Ohms (9 liters/2.25 US gallons), the low fuel warning light will illuminate to warn of the fuel status. Both Petrol and Diesel sensors are interfaced to the Instrument Cluster (Z142) via the BeCM (Z238). The resistance values then being represented by an A/D data transfer generating the required angular deflection on the gauge.