Figure 13.61. Connecting a resistor between the "Y" terminal of the connector and the vehicle ground to check the fuel gauge
Connect a resistor with a resistance of 8 to 96 ohms between the "Y" terminal of the connector and the vehicle ground (figure 13.61). Check that the wires do not touch the vehicle ground and turn on the ignition.
Figure 13.62. Readings of the electronic fuel level indicator when resistors of different resistances are connected to the connector
Figure 13.63. Readings of the analog fuel level gauge when resistors of different resistances are connected to the connector
Wait 2 minutes for the indicator readings to stabilize, then, following the figure 13.62 or 13.63, compare the actual readings of the pointer with the expected values.
If possible, repeat the test with resistors of different resistance within the specified ranges. Before changing resistors, turn off the ignition.
If the indicator shows a full or empty tank, regardless of the resistor resistance, then there is a short circuit or an open circuit in the sensor wires. Otherwise, incorrect readings are caused by a malfunction of the fuel level gauge itself.
Warning! Gasoline is extremely flammable. When working with fuel system components, the use of open flames, sparking devices, open fire-hazardous lighting devices, and smoking are prohibited. Avoid creating sparks when working with wires and electrical devices.