2427475 - D01 ENGINE NOT RUNNING SMOOTHLY / (HESISTANT)

During acceleration, there are decreases in performance, even prolonged
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation

Preliminarily check:

  • the state of the spark plugs and leads;
  • the condition of the air intake circuit
Continue to Step 1Spark plugs dirty or damagedReplace the spark plugs Op.   5510D10 
Spark plug leads damagedReplace the spark plug leads Op. 5510D14
Air intake circuit faultRestore the correct operation of the intake circuit
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;
  • parameter plausibiilty
Continue to Step 2'Supply system' error detectedSee table   Z50 
Another 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;
  • parameter plausibiilty
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.
3CHECK ON FUEL PRESSUREAll OKProblems metOperation
Carry out a road test, reproducing the conditions in which the fault arises.Check the fuel supply pressure Op.   0510C10  Continue to Step 4Incorrect pressure: obstructions in the fuel delivery pipeRemove the obstructions in the fuel pipe; if necessary replace it
Pressure not correct: tank insufficiently ventilatedRestsore the tank ventilation
Pressure not correct: fuel pump electrical circuit brokenRepair fuel pump electrical circuit
Pressure incorrect: fuel pump damagedReplace fuel pump assembly
4CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persists: control unit faultyReplace control unit Op.   1056B82