Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking component and wiring
Check the fuel level sensor's resistance. For resistance values, see: Sensors [1][2]Instrument Panel, Gauges and Warning Indicators

Note! Vehicles with AWD. There are 2 fuel level sensors, one in each pump unit. The sensors are connected in series with each other. If the total resistance in the circuit deviates from normal value, measure each sensor separately. For both total resistance and sensors' own resistance, see: Sensors [1][2]Instrument Panel, Gauges and Warning Indicators

Check the signal cable between fuel level sensor #2 and combined instrument panel #A5 (breakout box #5) for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and for open-circuits according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the ground lead between fuel level sensor #1 and combined instrument panel #A4 (breakout box #4) for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Hint: With ignition on and fuel level sensor disconnected the voltage in fuel level sensor connector #2 (combined instrument panel side) should be approximately 5 V.

Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting breakout box, Combined instrument panel Connecting the Breakout Box.
- For information about signals, see Connector A, #A1 - #A30 , Connector B, #B1 - #B16 and Connector D, #D1 - #D5.
- Sensors [1][2]Instrument Panel, Gauges and Warning Indicators









Continue - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off.
- Reinstall connectors, components etc.
Read off fuel level.





Is the value OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing 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 component and wiring

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