2427476 - D02 ENGINE NOT RUNNING SMOOTHLY / (LOSING POWER)

Under conditions of constant load and speed, there are intermittent 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 air filter
  • the condition of the air intake circuit;
  • absence of obstructions in the catalytic converter
Continue to Step 1Spark plugs dirty or damagedReplace the spark plugs Op.   5510D10 
Cables damagedReplace spark plug leads Op. 5510D14
Air intake circuit faultEliminate the problem
Catalyzer obstructedReplace the exhaust manifold Op.   1072C16 
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 
'Misfire' error detectedSee table   Z53 
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 3'Supply system' error detectedSee table   Z50 
'Misfire' error detectedSee table   Z53 
Sudden occurrence of another error detectedContinue following the instructions for the diagnostic equipment.
Parameters inconsistentContinue following the instructions for the diagnostic equipment.
3FUEL PRESSURE ROAD TESTAll OKProblems metOperation
Road test the vehicle and check the fuel supply pressure Op.   0510C10  in the conditions that lead to the anomalyContinue to Step 4Insufficient fuel pressure: pipes obstructedRemove restrictions
Insufficient fuel pressure: valve obstructedReplace the tank cap
Insufficient fuel pressure: regulator out of calibrationReplace the pump assembly
Low fuel pressure: defective pumpReplace the pump assembly
Low fuel pressure: clogged filterReplace the 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