| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| Check the following, in order:- engine control unit correctly fastened to earth; See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT - battery correctly fastened to earth;- positive battery terminal and all leads connected to it correctly fastened- correct connection of the engine control unit connector | Move on to Step 1 | Battery fastenings slack or oxidized | Restore correct fastenings |
| Control unit earth cable fastening loose | Tighten earth cable |
| Incorrectly connected engine control unit connector | Correctly engage engine control unit connector |
| 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 and check:- that there are no errors in the control unit;- parameter plausibility | Move on to Step 2 | Error detected in the control unit. | Continue following the instructions on the diagnostic equipment |
| Impossible to activate a dialogue with the control unit | Move on to Step 2 |
| 2 | ROAD TEST USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| Carry out a road test reproducing the conditions in which the fault occurs, keeping the diagnostic equipment connected and check:- that there are no errors in the control unit;- parameter plausibility | Move on to Step 3 | The sudden onset of errors in the control unit is detected | Continue following the instructions on the diagnostic equipment |
| Parameters off the scale. | Continue following the instructions on the diagnostic equipment |
| Loss of dialogue between the control unit and the diagnostic equipment. | Restore the correct connections. |
| 3 | IGNITION SYSTEM CHECK | All OK | Problems encountered | Operation |
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| - Check the continuity of the supply wiring for the coils- Check that the ignition coils are working, by carrying out the See Test 5510CI IGNITION COIL OPERATION CHECK | Move on to Step 4 | Power supply wiring to coils defective | Restore correct wiring |
| Defective coils. | Replace coils Op. 5510D10 SPARK PLUGS - R+R |
| 4 | INJECTION SYSTEM CHECK | All OK | Problems encountered | Operation |
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| - Check the continuity of the power supply wiring See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT | Move on to Step 5 | Power supply wiring to injectors defective | Restore correct wiring. |
| 5 | CORRECT OPERATION CHECK | All OK | Problems encountered | Operation |
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| Check that the engine control unit is working properly. | End of diagnosis | Engine management control unit defective. | Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R |