2398827 - K44 DISPLAY DOES NOT SHOW INSTANT CONSUMPTION ON TRIP METER

The fuel consumption indiator in the display (one of the TRIP COMPUTER module displays) does not work with te ignition ON.
The display shows two types of fuel consumption, instantaneous and average. The fuel consumption figures are processed by the instrument panel node on the basis of the information received from the body computer node (distance) and from the engine management node (litres consumed), made available to the instrument panel node via the B-CAN and the C-CAN, respectively.
If there is no speed information (from the Brake Node) or instantaneous fuel consumption (from the Engine Management Node) the consumption figure will be replaced by '----'
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Speak to the customer to check that the TRIP functions have not just been resetContinue to Step 1One of the TRIP COMPUTER functions has been resetThe information displayed will be '----' until a stretch of road sufficient to evaluate the consumption is travelled along: if the value is not displayed after a few kilometresContinue to Step 1
1CAN CHECKSAll OKProblems metOperation

Connect the EXAMINER diagnostic equipment and check the CAN NETWORK INFORMATION:

  • For inactive control units
  • For control units with errors
  • For control units with CAN errors
Continue to Step 2Presence of faults in the CAN Continue as instructed by the tester
Impossible to converse with the Body ComputerContinue to Step 9
2CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation

Keep the tester connected and check the BRAKE NODE for:

  • System/component faults
  • CAN faults
Continue to Step 3System/component faultsContinue as instructed by the tester
Presence of C-CAN faults Continue to Step 11
3CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation

Keeping the diagnostic equipment connected, check for the following at the ENGINE MANAGEMENT NODE:

  • System/component faults
  • CAN faults
Continue to Step 4System/component faultsContinue as instructed by the tester
Presence of C-CAN faults Continue to Step 11
4CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation

Keeping the diagnostic equipment connected, check at the INSTRUMENT PANEL NODE:

  • System/component faults
  • CAN faults
Continue to Step 12System/component faultsContinue as instructed by the tester
Presence of C-CAN faults Continue to Step 11
5CHECK WITH ACTIVE DIAGNOSISAll OKProblems metOperation
With the Examiner in the Instrument Panel Node ambient, check, in active diagnosis, that all the segments in the LCD module are correctly activatedContinue to Step 8One or more segments are not activatedReplace the instrument panel Op. 5560B11
Impossible to converse with the instrument panel Continue to Step 6
6ELECTRIC POWER SUPPLY CHECKAll OKProblems metOperation
Check that the Instrument Panel Node electrical power supply is correctContinue to Step 7Positive and/or earth electrical power supply faultyReplace the component involved (if a fuse is involved, search for the cause of the problem)
7CHECK ELECTRICAL CONNECTIONSAll OKProblems metOperation
Check the electrical connections between the Body Computer and the Instrument Panel, in particular that each individual pin is correctly connected Continue to Step 5Electrical connections not workingRestore damaged electrical connections.
8CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner check, in the Body Computer Node ambient, that there are no errorsContinue to Step 11Impossible to connect with the Body Computer control unitContinue to Step 9
There are errorsContinue in accordance with the instructions for the diagnostic equipment
9ELECTRIC POWER SUPPLY CHECKAll OKProblems metOperation
Check that the Body Computer Node electrical power supply is correct.Continue to Step 10Positive and/or earth electrical power supply fault.Replace the defective component (if a fuse is involved, search for the cause of the problem).
10CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner, check the possibility of connecting with the Body Computer Node. Continue to Step 8Impossible to connect with the Body Computer control unit.Replace the Body Computer Op.   5505A32 
11CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer present End of diagnosisThe fault persistsReplace the Body Computer Op.   5505A32 
12CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer present End of diagnosisThe fault persistsReplace the instrument panel Op. 5560B11