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 fixed
  • correct fixing of the positive battery terminal and the leads connected to it
  • for any obstructions in the catalyzer
  • that there is no water or other fluids in the fuel tank
Continue to Step 1Earth leads incorrectly fixedRenew or, if necessary, replace the battery earth lead Op.   5530B22 
Battery positive earth incorrectly fixedRestore battery positive lead Op.   5530B26 
Catalytic converter or precatalyzers obstructedReplace the exhaust manifold Op.   1072C12 
Presence of dirt in the fuel tankClean the fuel tank
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;
  • plausibility of all the parameters
Continue to Step 2Another error dectected in the control unitContinue following the instructions for the diagnostic equipment
Inconsistent parameterContinue following 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;
  • plausibility of all the parameters
Continue to Step 3Error arises suddenly in the control unitContinue following the instructions for the diagnostic equipment
Inconsistent parameterContinue following the instructions for the diagnostic equipment
Loss of dialogue between the control unit and diagnostic instrumentRestore the control unit circuit supply See   E5030  PETROL ENGINE ELECTRONIC MANAGEMENT
3CHECK ON FUEL PRESSURE ON ROADAll OKProblems metOperation
Road test the vehicle and check the fuel supply pressure Op.   0510C10 
Make sure that the conditions in which the problem occurs are reproduced
Continue to Step 4Pressure not correct: obstructions in fuel delivery pipeRemove the obstructions in the fuel pipe, and if necessary replace it Op.   1040B30 
Pressure not correct: tank insufficiently ventilatedRestsore the tank ventilation
Pressure not correct: fuel pump electrical circuit brokenRepair fuel pump electrical circuit See   E5030  PETROL ENGINE ELECTRONIC MANAGEMENT
Pressure incorrect: fuel pump damagedReplace fuel pump assembly Op.   1040A70 
4CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer present Fault persists: control unit defectiveReplace control unit Op.   1056B82  Search for the fault starting from another symptom'