Adjusting The Fuel Gauge / Sensor

Adjusting The Fuel Gauge/Sensor:

There are two possibilities of adjusting the fuel gauge reading, depending on the fault symptoms. Whether the reading error is of the same magnitude from full to empty tank or whether it occurs only at a certain fuel level.

Alternative 1. Gauge reading error across the whole scale.
Adjustment of Tank Offset means adjusting the fuel level sensor's input to the main instrument unit. Tank Offset can be adjusted from -5 to +3 litres. This command affects the Fuel Level read value and the fuel gauge indication.

After adjustment, switch the ignition off and on again as a check. Use the "Fuel level" read value to check the adjustment made.
1 Drain the fuel tank.
- The Read Value should be 0 litres.
2 Turn the ignition switch to OFF.
3 Add 10 litres of fuel to the tank.
4 Turn the ignition switch to ON.
5 Read value "Tank Contents". Adjust Tank offset to the correct value.
6 Activate the fuel gauge and check that the gauge reading is correct at all the "breakpoints". Adjust the breakpoints if necessary. For breakpoints set at the works, see adjusting the fuel gauge
7 Clear the diagnostic trouble codes in all systems.

- Perform a functional test.
Test OK?
YES The steps taken to rectify the fault were correct.
NO Go to Testing and Inspection/Fault Diagnosis, general/Before Changing a Control Module







Alternative 2. Reading error at a certain level.
1 Activate the fuel gauge and check that the gauge reading is correct at all the "breakpoints". Adjust the breakpoints if necessary.
For breakpoints set at the works, see adjusting the fuel gauge

2 Clear the diagnostic trouble codes in all Systems.

- Perform a functional test.
Test OK?
YES The steps taken to rectify the fault were correct.
NO Go to Testing and Inspection/Fault Diagnosis, general/Before Changing a Control Module

Adjusting The Fuel Gauge

Adjusting The Fuel Gauge:

Adjustment of fuel gauge breakpoints. If the reading error occurs only at a certain fuel level, adjust the fuel gauge reading by means of the relevant command.

1 Tank Empty, 0 litres
Adjustment of gauge reading at 0-litre breakpoint. Can be adjusted from -3 to +2 litres. Does not affect the "Fuel level" read value. Use the "Activate" command to check the reading.

2 Tank Reserve, 10 litres
Adjustment of gauge reading at 10-litre breakpoint. Can be adjusted from -5 to +5 litres. Does not affect the "Fuel level" read value. Use the "Activate" command to check the reading.

3 Tank 1/4, 17 litres
Adjustment of gauge reading at 17-litre breakpoint. Can be adjusted from -3 to +2 litres. Does not affect the "Fuel level" read value. Use the "Activate" command to check the reading.

4 Tank 1/2, 33 litres (US/CA 32 litres)
Adjustment of gauge reading at 33-litre breakpoint. Can be adjusted from -3 to +2 litres. Does not affect the "Fuel level" read value. Use the "Activate" command to check the reading.

5 Tank 3/4, 49 litres (US/CA 47 litres)
Adjustment of gauge reading at 49-litre breakpoint. Can be adjusted from -3 to +2 litres. Does not affect the "Fuel level" read value. Use the "Activate" command to check the reading.