Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the wires and connectors
Check the fuel gauge sensor resistance (right side). The resistance across the respective sensor may vary between 12 ohm (full tank) and 383 ohm (empty tank).

Hint: The resistance of the fuel gauge sensor (right side) can be measured between fuel gauge sensor connectors 7 and 6. The resistance of the left fuel gauge sensor can be measured between fuel gauge sensor connectors 5 and 6.

Check the wires between fuel gauge sensor connector 7 and control unit A08 ( A8) for a short circuit to ground as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and for an open circuit as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check ground wire between control unit A10 ( A10) and fuel gauge sensor connector 6 for an open circuit as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check wire between left and right fuel gauge sensor for an open circuit as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Do the necessary corrective action.

Additional information:
- For information on signals and additional values, see Signal specification Signal Specification
- To connect the test box, see Connecting the breakout box Connecting Breakout Box, Rear Electronic Module (REM)
- To access the control unit, see Integrated relay/fusebox cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- To access the fuel gauge 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.









Continue - Verification

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Verification




Verification

Hint: After the repair it is necessary to check that the fault has been rectified.








- Ignition off.
- Install the components, connect the connectors, etc.
- Make sure there are more than two liters of fuel in the right tank half.
- Ignition on.
Read the fuel level in the right tank half.





Is the value normal?

Yes - Verification completed

No - Trouble-shooting information

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Trouble-shooting information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit Fault-Tracing

No - Attempt New Test

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Attempt New Test - Checking the wires and connectors

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