3022585 - D21 ENGINE CUTS OUT WHILST DRIVING

The engine cuts out suddenly whilst driving. Later, after starting normally, it works again
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation

Preliminarily check:

  • that the earth is correctly fixed on the engine
  • that the battery earth is correctly fastened ; See   E1020  EARTHS
  • that the positive battery terminal and the cables connected to it are correctly fastened See   E1010  SUPPLY
  • no water in the fuel filter
Continue to Step 1Earth leads incorrectly fixed Renew or, if necessary, replace the battery earth lead Op.   5530B22 
Battery positive earth incorrectly fixedRestore battery positive lead Op.   5530B26 
Presence of water in the fuel Replace the fuel
1CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket

Check:

  • for errors in the control unit
  • the plausibility of all the parameters.
Continue to Step 2An error is detected in the control unitContinue following the instructions for the diagnostic equipment
Inconsistent parameterContinue according to the instructions for the diagnostic equipment
2ROAD TEST WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Road test the vehicle, reproducing the conditions in which the fault arises, keeping the diagnostic equipment connected.

Check:

  • that there are no errors in the control unit;
  • the plausibility of all the parameters, in particular the rail pressure - rail pressure setting
Continue to Step 3Error arises suddenly in the control unitContinue according to the instructions for the diagnostic equipment
Inconsistent parameterContinue according to the instructions for the diagnostic equipment, analysing the causes that have led to the inconsistency
Loss of dialogue between the control unit and diagnostic instrumentRestore the control unit circuit supply See   E5030  PETROL ENGINE ELECTRONIC MANAGEMENT
3LOW FUEL PRESSURE CIRCUIT CHECKAll OKProblems metOperation
Road test the vehicle and check the fuel supply pressure
Make sure that the conditions in which the problem occurs are reproduced
Continue to Step 4Pressure not correct: obstructions in the pipe Remove the obstructions in the fuel pipe, and if necessary replace it
Pressure incorrect: fuel pump damagedReplace fuel pump assembly Op.   1040A70 
4COIL OPERATION AND SUPPLY CHECKAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persists: control unit faultyReplace control unit Op.   1056B82