| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| First, check:- the condition of the air intake circuit- correct earth connection of the coils and the control unit motor to the engine block See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT - leads properly connected to battery | Move on to Step 1 | Air intake circuit faulty | Restore the seal on the air intake circuit |
| Control unit motor earth connection on the engine block is defective | Restore the correct earth connection |
| Loose cables to the battery | Restore correct tightening |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| 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 plausibility | Move on to Step 2 | Error detected in the control unit | Continue following the instructions on the diagnostic equipment |
| Parameter not consistent | Continue following the instructions on the diagnostic equipment |
| 2 | FUEL PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Carry out a road test, reproducing the conditions in which the fault occurs.Check the fuel supply pressure Op. 0520G46 FUEL SYSTEM - CHECK SUPPLY PRESSURE USING THE EXAMINER | Move on to Step 3 | 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 | Replace the petrol pump assembly Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R |
| 3 | SOLENOID CANISTER CHECK | All OK | Problems encountered | Operation |
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| - With the Examiner in active diagnosis, check that the solenoid canister is working properly- Check continuity of wiring between engine control unit and solenoid canister See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT | Move on to Step 4 | Defective solenoid canister | Replace the solenoid |
| Wiring broken | Restore correct wiring |
| 4 | CORRECT OPERATION CHECK | All OK | Problems encountered | Operation |
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| Check that the fault is no longer present | End of diagnosis | The fault persists | Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R |