| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| First of all, check for water or other fluids in the fuel tank. | Move on to Step 1 | Presence of dirt in the fuel tank | Clean the fuel tank |
| 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 faults in the engine management control unit. | Move on to Step 2 | Error detected in the control unit | Continue following the instructions given by the diagnostic equipment. |
| No communication with the control unit. | Restore the connection between the engine management control unit and the diagnostic connector See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 2 | BLOW-BY CIRCUIT CHECK | All OK | Problems encountered | Operation |
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| Check the condition of the blow-by gas intake circuit. In particular, check for obstructions in the separator or pipes | Move on to Step 3 | Fault in the blow-by circuit. | Restore circuit to working order: replace the pipes if necessary. |
| 3 | TURBOCHARGER OPERATION/CONDITION CHECK | All OK | Problems encountered | Operation |
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| Check operation and for lubricant oil leaks. | Move on to Step 4 | Turbocharger inefficient. | Replace the turbocharger Op. 1064A27 PIPE BETWEEN VACUUM RESERVOIR AND ACTUATOR CONTROL SOLENOID VALVE - R.R. |
| 4 | CYLINDER COMPRESSION CHECK | All OK | Problems encountered | Operation |
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| Carry out cylinder compression test Op. 0520G15 COMPRESSION TEST - CHECK WITH EXAMINER WITH SPARK PLUGS/INJECTORS REMOVED | Move on to Step 5 | Cylinder compression insufficient. | Move on to Step 6 |
| 5 | CHECK CYLINDER HEAD GASKET AND VALVE OIL SEALS | All OK | Problems encountered | Operation |
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| Check:- that the cylinder head is correctly tightened;- the seal of the gasket;- the seal of the valve oil seals. | Move on to Step 7 | Cylinder head tightening not correct. | Restore the correct cylinder head tightening. |
| Gasket damaged. | Head gasket replacement Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET |
| Oil seal missing. | Restore the correct oil seal. |
| 6 | CHECK ON CAUSE OF INSUFFICIENT COMPRESSION | All OK | Problems encountered | Operation |
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| After having removed the cylinder head Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET check:- the valve seal;- cylinder/piston ring wear. | Move on to Step 7 | Valve seal insufficient. | Overhaul the cylinder head. |
| Cylinder/ring wear outside tolerance. | Restore correct operating clearance. |
| 7 | 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. | Contact technical service for further information on the problem. |