125000493 - D01 ENGINE NOT RUNNING SMOOTHLY / (HESISTANT)
There is a (prolonged) fall in performance (flat spots) during acceleration| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation |
|---|---|---|---|---|
Preliminarily check:
| Continue to Step 1 | Air intake circuit fault | Restore the correct operation of the intake circuit | |
| Spark plugs not the type recommended by the manufacturer | Replace the spark plugs Op. Op. 5510D10 SPARK PLUGS - R+R | |||
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
| Connect the diagnostic test equipment (Examiner or other instruments) to the tester input. Check:
| Move on to Step 2 1 | Presence of errors | Continue following the instructions for the diagnostic equipment | |
| Parameter not consistent | Continue as instructed by the Tester and analyse the facors that could give to the inconsistencies. | |||
| 2 | ROAD TEST USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
| Carry out a road test reproducing the conditions in which the fault occurs, keeping the diagnostic equipment connected. Check:
| Move on to Step 3 1 | The sudden onset of an error in the control unit is detected | Continue following the instructions for the diagnostic equipment | |
| Parameter not consistent | Continue as instructed by the Tester and analyse the facors that could give to the inconsistencies. | |||
| 3 | LOW PRESSURE CIRCUIT CHECK | All OK | Problems encountered | Operation |
| Move on to Step 4 1 | Pressure not correct: obstructions in the fuel supply pipe | Remove the obstructions in the fuel pipe, replace it if necessary | ||
| Pressure not correct: tank not sufficiently ventilated | Restore the tank ventilation | |||
| Pressure not correct: petrol pump damaged or not correctly supplied | Replace the petrol pump assembly Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R | |||
| 4 | RAIL PRESSURE SENSOR CHECK | All OK | Problems encountered | Operation |
| Check the operation of the pressure sensor on the rail | Move on to Step 5 1 | Pressure sensor fault | Replace the sensor Op. 1056F54 | |
| 5 | PRESSURE REGULATOR CHECK | All OK | Problems met | Operation |
| Check that the voltage regulator is working | Continue to Step 6 | Pressure regulator faulty | Replace the pressure regulator Op. 1056F52 | |
| 6 | HIGH PRESSURE PUMP CHECK | All OK | Problems encountered | Operation |
| Check high pressure pump operation | Move on to Step 7 1 | High pressure pump fault | Replace high pressure pump Op. 1056F72 | |
| 7 | INJECTOR CHECK | All OK | Problems encountered | Operation |
| Check continuity/insulation of injector wiring. In particular, check injector pilot signal is present. See See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT | Move on to Step 8 1 | Signal not present, wiring broken | Restore wiring See See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT | |
| Signal not present, wiring not broken | Replace the engine management control unit Op. 1056F82 | |||
| 8 | CHECK VARIABLE VALVE TIMING IN ACTIVE DIAGNOSTIC MODE | All OK | Problems encountered | Operation |
| Check variable valve timing operation when in active diagnostic mode | Move on to Step 9 1 | Not operational | Use a voltmeter (preferably graphic) to check the vvt control signal. If necessary, replace the vvt Op. Op. 1036C40 TIMING VARIATOR ON INLET CAMSHAFT IN CYLINDER HEAD R + R WITH SHAFT REMOVED | |
| 9 | CHECK MODULAR MANIFOLD IN ACTIVE DIAGNOSIS MODE | All OK | Problems encountered | Operation |
| Check the operation of the modular manifold in active diagnosis mode | Move on to Step 10 1 | Not operational | Use a voltmeter (preferably graphic) to check the modular manifold control signal. Replace the modular manifold solenoid if necessary Op. 1072D44 | |
| 10 | CHECK IGNITION OPERATION | All OK | Problems encountered | Operation |
| Check continuity/insulation of coil supply and control circuit. In particular, check coil pilot signal is present. See See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT | Move on to Step 11 1 | Supply/earth not present | Restore wiring See See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT | |
| Control signal missing | Check wiring from coil to ECU. If necessary, replace control unit Op 1056F82 | |||
| 11 | TIMING CHECK | All OK | Problems encountered | Operation |
| Check that the valve gear timing is correctly adjusted Op. Op. 0510A20 TIMING GEAR WITH BELT DRIVE - CHECK - CARRY OUT OPERATION WITH CAM COVER(S) REMOVED AND TAPPETS ADJUSTED | Move on to Step 12 1 | Timing not correct | Adjust valve gear timing Op. Op. 1032B10 TOOTHED TIMING BELT - R + R FOR TIMING ADJUSTMENT OR REPLACEMENT | |
| 12 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
| Check that the fault is no longer present | End of diagnosis | . | ||