Checking the Fuel Level Sensor

Checking the fuel level sensor

Checking wiring and connectors

Check the wiring between:
connector terminal #5 for the fuel level sensors and rear electronic module (REM) terminal #A02 (#A2)
connector terminal #6 for the fuel level sensors and rear electronic module (REM) terminal #A10 (#A10)
connector terminal #7 for the fuel level sensors and rear electronic module (REM) terminal #A8 (#A8)
check for an open-circuit. Check for a short-circuit to supply voltage.
Check the relevant connectors. Check for contact resistance and oxidation.
Remedy as necessary.

Other information:
- For further information about signals and other values, see Signal specification Pinout Values and Diagnostic Parameters
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access the integrated relay / fusebox in the cargo compartment, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- To access the fuel level sensor connector (left-hand side), see Level sensor fuel tank, replacing Service and Repair
- To access the fuel level sensor connector (right-hand side), see Level sensor, fuel tank, right-hand/fuel tank, replacing Level Sensor, Fuel Tank/Fuel Pump, Replacement
- Checking wiring and terminals Checking Wiring And Terminals.









Was a fault detected?

Yes - Fault Found

No - Checking the resistance of the sensor

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Checking the resistance of the sensor
Check the resistance of both the fuel level sensors. The resistance across each sensor may vary between 12 ohms (full fuel tank) and 383 ohms (empty fuel tank).

Hint: The resistance of the left fuel level sensor can be measured between terminals #5 and #6 on the connector for the fuel level sensors. The resistance of the right fuel level sensor can be measured between terminals #6 and #7 on the connector for the fuel level sensors.

Remedy as necessary.

Other information:
- For further information about signals and other values, see Signal specification Pinout Values and Diagnostic Parameters
- To access the connector/replace the fuel level sensor connector (left-hand side), see Level sensor fuel tank, replacing Service and Repair
- To access the connector/replace the fuel level sensor connector (right-hand side), see Level sensor, fuel tank, right-hand/fuel tank, replacing Level Sensor, Fuel Tank/Fuel Pump, Replacement.









Was a fault detected?

Yes - Fault Found

No - Checking floats and wiring

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Checking floats and wiring
Check that the floats for the fuel levels sensors have not stuck.
Check the cable inside the fuel tank between the two sensors. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Remedy as necessary.

Other information:
- For further information about signals and other values, see Signal specification Pinout Values and Diagnostic Parameters
- To access or replace the fuel level sensor (left-hand side), see Level sensor fuel tank, replacing Service and Repair
- To access or replace the fuel level sensor (right-hand side), see Level sensor, fuel tank, right-hand/fuel tank, replacing Level Sensor, Fuel Tank/Fuel Pump, Replacement
- Checking wiring and terminals Checking Wiring And Terminals.









Was a fault detected?

Yes - Fault Found

No - No Fault Found

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