If the float with a full tank is in its highest position, then the resistance in the sensor in the fuel tank is bridged, the bimetal in the indicator heats up completely and causes the arrow to deviate to the end. As the content in the fuel tank decreases, the float drops, increasing resistance due to this inhibits the passage of current to the bimetal, the arrow deviates less.
Troubleshooting
In case of incorrect indication due to a bent float rocker, dismantle the fuel level sensor.
Bending the float arm upwards decreases the indicator reading. Bending down gives a higher indicator reading. Bend the rocker carefully!
Checking the fuel level sensor: Disconnect the wire connector on the locking cap.
Connect the auxiliary wire to the blue/black wire connector and attach directly to ground.
Briefly turn on the ignition - if the arrow deviates to the side «Full», the sensor is defective.
The fuel quantity indicator consists of:
1 - instrument scale with a bimetallic element located behind it;
2 - sensors with resistance;
3 - ground connections;
4 - float;
5 - battery;
6 - ignition / start switch.
For a functional check of the temperature sensor, disconnect the wire on the sensor and attach to the ground. Turn on the ignition for a short time: the indicator needle should move along the scale. The photo on the left shows the temperature sensor on the 1.6L 16V model. In the photo on the right, the temperature sensor in models with engines 1.8 and 2.0 l 16V.
If the arrow does not move, then either there is no conductivity in the blue / black wire to the instrument panel, or from the locking cap to the fuel level sensor, a defect in the printed circuit board or in the indicator device.
A defective indicator device must not be dismantled. In this case, you need to change the instrument housing assembly.
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