3233020 - 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:

Then check:

  • that the earth is correctly fixed on the engine
  • that the battery earth is correctly fastended See   E1020  EARTHS ;
  • that the positive battery terminal and the cables connected to it are correctly fastened See   E1020  EARTHS ;
  • control unit supply (including ignition switch)
 Continue to Step 1 Earth leads incorrectly fixed Renew or, if necessary, replace the battery earth lead Op.   5530B22 
Battery positive earth incorrectly fixed Restore battery positive lead Op. 5530B26
Inconsistent supplyRenew supply/earth
1CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.

check

  • that there are no faults in the engine management control unit;
  • the plausibility of all the parameters.
 Continue to Step 2 An error is detected in the control unitContinue according to 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 faults in the engine management control unit;
  • the plausibility of all the parameters, in particular the rail pressure - rail pressure setting
 Continue to Step 3 Error 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 instrument Restore 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 4 Pressure not correct: obstructions in the pipeRemove the obstructions in the fuel pipe, and if necessary replace it
Pressure incorrect: fuel pump damaged Replace fuel pump assembly Op.   1040A70 
4COIL OPERATION AND SUPPLY CHECKAll OKProblems metOperation
Check the continuity/insulation of the supply circuit and coil operation; in particular, make sure that the coil operating signal is present See   E5030  PETROL ENGINE ELECTRONIC MANAGEMENT Continue to Step 5 Faulty wiring Renew the wiring See   E5030  PETROL ENGINE ELECTRONIC MANAGEMENT
Wiring intact, no signal Continue to Step 5
5CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persists: control unit faulty Replace engine management control unit Op.   1056B82