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Lancia Thesis Factory Service Manual (2002-2009)22 · Fault diagnosis
22 · Diagnostics

Fuel level gauge not working

Make
Lancia
Model
Thesis Factory Service Manual
Year
2002–2009
Section
On-board instruments › Fuel level gauge not working
Fault diagnosisFuel level gauge not working

FUEL LEVEL GAUGE NOT WORKING

With key on, the fuel level gauge on the instrument panel does not work (level indicated is not actual tank level);

the fuel level message is supplied by the "body computer node" and made available to the "instrument panel node" via the B-CAN network; the "Body Computer node" also sends a fuel level sensor error message.

The operation should always be carried out with the engine switched off and the ignition switched off. If the operation is carried out with the engine switched on, but the ignition switched off, there may be a temporary incorrect fuel level reading due to the internal logic of the control system and not down to a system malfunction.

STEPOPERATIONS TO BE CARRIED OUTTEST RESULTS
0PRELIMINARY CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check the following with the engine running:

  • the level pointer is not in contact with the 0 mark and the fuel reserve warning light is not flashing
  • There are no error messages on the reconfigurable matrix
Move on to Step1. Level pointer in contact and warning light flashingMove on to Step
2. Presence of fault messageMove on to Step
1CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION

Connect the Examiner diagnostic equipment to the diagnostic connector and check the following at the CAN:

  • no control unit not activated;
  • that there are no faulty control units;
  • no control unit with faulty CAN line;
Move on to StepPresence of faultsContinue following the instructions for the diagnostic equipment
2CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION

Keeping the Examiner diagnostic equipment connected to the diagnostic connector, check the following at the instrument panel node:in active diagnosis ambient

  • operation of the fuel level gauge
Move on to StepPointer does not move

Replace instrument panel

See in Op. 5560B11 ANALOGUE CONTROL PANEL - R.R. or Replace

3CHECK FUEL LEVEL SENSORALL OKPROBLEMS ENCOUNTEREDACTION
Check fuel level sensor operationMove on to StepSensor not working

Replace the fuel pump assembly

See in Op. 1040A70 SUBMERGED PUMP ASSEMBLY complete with level gauge - R.R.

4CHECK ELECTRICAL CIRCUITALL OKPROBLEMS ENCOUNTEREDACTION

Check the continuity/insulation of the lead between fuel level sensor and body computer

(Wiring Diagram ) E4010 INSTRUMENT PANEL

Move on to StepLeads interrupted or not insulated

Restore continuity or insulation

(Wiring Diagram ) E4010 INSTRUMENT PANEL

5CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Check that the fault is no longer presentFault persists

Replace body computer

See in Op. 5505A32 BODY COMPUTER - R.R.

Parts & tools for this job For 2002 Lancia Thesis

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