Workshop Manuals Factory service & repair Alfa Romeo
Alfa Romeo 147 Factory Service Manual (2000-2002)18 · Fault diagnosis
18 · Diagnostics

D21 Engine stops on the move

Make
Alfa Romeo
Model
147 Factory Service Manual
Year
2000–2002
Section
Engine › D21 Engine stops on the move
Fault diagnosisD21 Engine stops on the move

D21 Engine stops on the move

The engine cuts out suddenly whilst driving. Later, after starting normally, it works again

StepTest procedureResultAction
0PRELIMINARY CHECKS

First check:

  • that the earth is correctly fastened on the engnie;
  • that the battery earth is correctly fixed;
  • that the positive battery terminal and the cables connected to it are correctly fastened;
  • for any obstructions of the catalyzer;
  • that there is no water or other fluids in the fuel tank
OK

Move onto step 1

Earth lead incorrectly fastened
  • Renew or, if necessary, replace the battery earth lead Op. 5530B22

End of diagnosis

Battery postive incorrectly fastened

End of diagnosis

Catalytic converter obstructed

End of diagnosis

Presence of dirt in the fuel tank
  • Clean the fuel tank

End of diagnosis

1CHECK WITH DIAGNOSTIC EQUIPMENT

Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket

Verify:

  • that there are no faults in the engine management control unit
  • the plausibiilty of the parameters
OK

Move onto step 2

Another error dectected in the control unit
  • Continue following the instructions for the diagnostic equipment

End of diagnosis

Incoherent parameter
  • Continue following the instructions for the diagnostic equipment

End of diagnosis

2ROAD TEST WITH DIAGNOSTIC EQUIPMENT

Road test the vehicle, reproducing the conditions under which the fault arises, keeping the diagnostic equipment connected

Verify:

  • that there are no faults in the engine management control unit
  • the plausibiilty of the parameters
OK

Move onto step 3

Error arises suddenly in the control unit
  • Continue following the instructions for the diagnostic equipment

End of diagnosis

Inconsistent parameter
  • Continue following the instructions for the diagnostic equipment

End of diagnosis

Loss of communication between the control unit and diagnostic instrument

End of diagnosis

3FUEL PRESSURE ROAD TEST

Road test the vehicle and check the fuel supply pressure Op. 0510C10

NOTE: Make sure that the conditions in which the problem occurs are reproduced

OK

Move onto step 4

Incorrect pressure: obstructions in the fuel supply pipe
  • Remove the obstructions in the fuel pipe, and if necessary replace it Op. 1040B30

End of diagnosis

Incorrect pressure: tank not sufficiently ventilated
  • Restore tank ventilation

End of diagnosis

Pressure incorrect: fuel pump electrical circuit interrupted

End of diagnosis

Pressure incorrect: fuel pump damaged

End of diagnosis

5CHECKING CORRECT OPERATION

Check that the fault is no longer present

OK

Incorrect selection of diagnostic procedure

Fault persists: control unit defective

Incorrect selection of diagnostic procedure

Parts & tools for this job For 2000 Alfa Romeo 147

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