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 terminal # A02 (#A2)
connector terminal #6 for the fuel level sensors and rear electronic module terminal #A10 (#A10)
connector terminal #7 for the fuel level sensors and rear electronic module 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 Breakout Box, Rear Electronic Module (REM)
- To access the integrated relay / fusebox in the cargo compartment, see Integrated relay/fuse box cargo compartment/rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- To access the connector for the fuel level sensors, see Left fuel gauge sensor Left Fuel Gauge Sensor and Right side fuel pump with level sensor Right Side Fuel Pump With Level Sensor
- Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.









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 for the fuel level sensors and to replace the fuel level sensors, see Left fuel gauge sensor Left Fuel Gauge Sensor and Right side fuel pump with level sensor Right Side Fuel Pump With Level Sensor.









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 and replace the fuel level sensors, see Left fuel gauge sensor Left Fuel Gauge Sensor and Right side fuel pump with level sensor Right Side Fuel Pump With Level Sensor
- Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.









Was a fault detected?

Yes - Fault Found

No - No Fault Found

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