| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| Check whether the problem is associated with oil consumption. | Move on to Step 1 | Excessive oil consumption | Proceed as instructed in the See table X005 EXCESSIVE OIL CONSUMPTION |
| 1 | AIR CIRCUIT CHECK | All OK | Problems encountered | Operation |
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| Check:- the condition of the air filter;- the condition and seal of the air supply circuit. | Move on to Step 2 | Circuit component damaged | Replace the damaged component. |
| Filter element dirty or damaged. | Replace the filter element Op. 1048A14 AIR CLEANER FILTER ELEMENT - REPLACE. |
| 2 | | 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 present in the engine management control unit. | Move on to Step 3 | Errors detected. | Continue following the instructions given by the diagnostic equipment. |
| No dialogue with the engine management control unit. | Restore the correct connection between the engine management control unit and the diagnostic socket See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| 3 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| Keeping the diagnostic equipment connected, carry out active diagnosis of the injectors. | Move on to Step 4 | Connections faulty. | Restore the correct connection for the injectors and the solenoid with the engine management control unit See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| Injectors faulty. | Replace the injectors Op. 1060F10 FUEL INJECTORS - R.R. |
| 4 | FUEL PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Check the correct fuel supply pressure by performing See Test 1060OB Low pressure fuel supply circuit check | End of diagnosis | Pressure not correct. | Replace the fuel pump assembly Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R |