323000722 - D002 ENGINE NOT RUNNING SMOOTHLY / (LOSING POWER)

Momentary lack of response when the accelerator pedal is pressed. Can happen at any speed. Usually it is more obvious when trying to get the vehicle to set off, for example after a stop.
Test results
0PRELIMINARY CHECKSAll OKProblems encounteredOperation
Check the following, in order:- no leaks in fuel circuit;- condition of the air intake circuit;- no obstructions in the catalytic converter;- no water or impurities in the petrol - fuel filter very blockedMove on to Step 1Fault in the air intake circuitRenew the air intake circuit
Obstruction in the catalytic converterReplace the catalytic converter    Op. 1080B62 CATALYTIC CONVERTER - R + R
Water in the fuelRemove water from the fuel
Leaks in fuel circuitEliminate leaks
Fuel filter blockedReplace the fuel filter
1CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Check:- that there are no errors in the control unit;- parameter plausibility.Move on to Step 2Error detected in the control unitContinue following the instructions on the diagnostic equipment
Parameters not plausibleContinue following the instructions on the diagnostic equipment
2ROAD TEST USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Carry out a road test, keeping the diagnostic equipment connected.
Make sure that the conditions in which the problem occurs are reproduced
Check:- that there are no errors in the control unit;- parameter plausibility.
End of diagnosisThe sudden onset of errors in the control unit is detectedContinue following the instructions on the diagnostic equipment
Parameters off the scale.Move on to Step 3
3ACCELERATOR PEDAL CHECKAll OKProblems encounteredOperation
Using the Examiner, check that the signal reaches 100% when reading the parameters and goes to the end of travel positionMove on to Step 4Accelerator pedal travel incorrectRestore the accelerator pedal travel
Accelerator pedal potentiometer defectiveReplace the accelerator pedal    Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R
4MOTORIZED THROTTLE OPERATION CHECKAll OKProblems encounteredOperation
Check the condition of the motorized throttle actuator connectionCheck the condition of the wiringCheck that the motorized throttle is working properly, carrying outSee Test 1056BW Move on to Step 5Connection defectiveRestore correct connection.
Wiring defectiveRestore the correct wiring.
Motorized throttle defectiveReplace the motorized throttle    Op. 1056B14 THROTTLE CASE - R + R
5IGNITION SYSTEM CHECKAll OKProblems encounteredOperation
Inspect the spark plugs, checking:- for possible electrode wear;- for carbon deposits;- for any damage to the spark plug insulator;- that the distance between the electrodes is correct;- the correct HV signal, by carrying out the    See Test 5510CI IGNITION COIL OPERATION CHECK    See Test 5510CE IGNITION CONTROL SIGNAL CHECK    See Test 5510OB IGNITION COIL RESISTANCE CHECKMove on to Step 6Spark plugs defectiveReplace spark plugs    Op. 5510D10 SPARK PLUGS - R+R
Coils defectiveReplace coils    Op. 5510C14 IGNITION COIL/S - R.R.
6INJECTOR CHECKAll OKProblems encounteredOperation
Using the Examiner, check in active diagnosis that all the injectors are working properly.Identify any injector that may be mechanically stuck shut.Move on to Step 7Injector defectiveReplace the injector    Op. 1056B70 INJECTOR (ONE) - R + R WITH FUEL MANIFOLD PIPE REMOVED - INCLUDES SEAL REPLACEMNT
7ELECTRIC PUMP CHECKAll OKProblems encounteredOperation
Check that the electric pump is receiving the correct power supply by carrying out the following:    See Test 1040AA CHECK ON SUPPLY VOLTAGE AND CURRENT UPTAKEMove on to Step 8Connection to electric pump earth defectiveRestore the correct earth connection.
Electric pump defectiveReplace the electric pump    Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
8CORRECT OPERATION CHECKAll OKProblems encounteredOperation
Check that the fault is no longer presentEnd of diagnosisThe fault persistsReplace the engine management control unit    Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R