3360270 - K20 FUEL LEVEL GAUGE NOT WORKING

With the ignition key in the ON position, the fuel gauge indicator is not working properly or it indicates a different level from what is actually in the tank.
the fuel level message is supplied by the 'body computer node' and is made available to the 'instrument panel node' via the B-CAN network; the 'body computer node' also sends the fuel level sensor error message.
Results of the tests
0PRELIMINARY CHECKAll OKProblems metOperation

Check that with the engine started up:

  • The level indicator is not at 0 and the fuel reserve warning light is not flashing
  • There are no error messages at the matrix that can be reconfigured
Continue to Step 2 level indicator at zero and warning light flashingContinue to Step 3
presence of failure messagesContinue to Step 1
1CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect the diagnostic equipment (Examiner or other instruments) to the Body Computer.

Check the CAN network information:

  • control units inactive
  • control unit errors
  • control units with errors in CAN line
Continue to Step 2Presence of faults in the CAN networkContinue following the instructions for the diagnostic equipment
2CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation

Keeping the diagnostic equipment (Examiner or other instruments) connected to the diagnostic socket, check:

  • that the pointer is working via active diagnosis
Continue to Step 3The pointer does not moveReplace instrument panel Op. 5560B11
3FUEL LEVEL SENSOR CHECKAll OKProblems metOperation
Check the operation of the fuel level sensor, see test ---Continue to Step 4Sensor not workingReplace the fuel pump assembly Op.   1040A70 
4CHECKING ELECTRICAL CIRCUITAll OKProblems metOperation
Check the continuity/insulation of the cable between the fuel level sensor and the Body Computer : See   E4010  INSTRUMENT PANEL Continue to Step 5Cables broken or not insulatedRestore continuity or insulation: See   E4010  INSTRUMENT PANEL
5CHECKING CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentFault presentSearch for the fault starting from another symptom'