| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| Check the following, in order:- presence of fuel in the tank;- engine control unit correctly fastened to earth;- battery correctly fastened to earth;- positive battery terminal and all leads connected to it correctly fastened- no impurities/water in the fuel tank- no obstructions in the air intake circuit | Move on to Step 1 | No fuel | Add fuel to the tank |
| Fastening slack or oxidized | Restore correct fastenings |
| Presence of dirt in the fuel tank | Add fuel to the tank |
| Circuit obstructed | Clean the tank and pipes and replace the filter element |
| Restore to correct operation. |
| 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 | CONTROL UNIT POWER SUPPLY CHECK | All OK | Problems encountered | Operation |
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| - Check that the engine control unit is receiving the correct power supply- Check the continuity of the power supply wiring- Check the continuity of the engine compartment control unit fuses See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT | Move on to Step 3 | Main relay defective | Replace the relay |
| Control unit power supply wiring defective | Restore wiring |
| Power supply fuses blown | Replace the blown fuses after having ascertained the cause of the problem |
| 3 | 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 4 | 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. |
| 4 | IGNITION SYSTEM CHECK | All OK | Problems encountered | Operation |
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| - Check the continuity of the power supply wiring- Check that the ignition coils are working, by carrying out the See Test 5510CI IGNITION COIL OPERATION CHECK | Move on to Step 5 | Power supply wiring to coils broken | Restore wiring |
| Defective coils. | Replace coils Op. 5510C14 IGNITION COIL/S - R.R. |
| 5 | 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 6 | Power supply wiring to injectors broken | Restore wiring |
| 6 | FUEL PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Carry out a road test and check the fuel supply pressure in the conditions in which the problem occurs.Check that the fuel lines are not blockedCheck that the fuel pump is working properly by carrying out the See Test 1040AB SUBMERGED FUEL PUMP CHECKCheck that the fuel filter is not blocked. | Move on to Step 7 | Fuel pressure too low: pipes obstructed | Eliminate the constrictions, replace the pipes if necessary |
| Fuel pressure too low: pump defective. | Replace the fuel pump assembly Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R |
| Fuel filter blocked. | Replace the fuel filter. |
| 7 | 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 |