| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| Check that the engine oil level is correct Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARYCheck that the air intake/vacuum circuit is working properly by carrying out the See Test 1048OA AIR INTAKE/VACUUM CIRCUIT CHECKCheck the condition of the fuel supply circuit and make sure that it is working properly carrying out the See Test 1040OA FUEL SUPPLY CIRCUIT CHECKCheck the operation of the low pressure supply circuit by carrying out the See Test 1060OB CHECK ON SUPPLY LOW PRESSURE FUEL CIRCUIT | Move on to Step 1 | Oil level incorrect | Restore the correct engine oil level Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY |
| 1 | AMBIENT PARAMETERS CHECK | All OK | Problems encountered | Operation |
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| Select the following control unit at the diagnostic equipment: EDC16C39 Diesel electronic injection control unit.Check the value of the following parameters:. Battery voltage See Test 5530BB BATTERY VOLTAGE CHECK. Engine rpm See Test 1060GI ENGINE SPEED CHECK. Atmospheric pressure See Test 1060GD ATMOSPHERIC PRESSURE CHECK. Engine coolant temperature See Test 1060OE CHECK ON OPERATION OF COOLANT TEMPERATURE SENSOR. Diesel temperature See Test 1060EA DIESEL FUEL TEMPERATURE CHECK | Move on to Step 2 | | |
| 2 | PREHEATING RELAY ACTIVE CHECK | All OK | Problems encountered | Operation |
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| Carry out the active diagnosis for the preheating relay, checking that the result is positive. | The check on the following system is only necessary if the outside temperature is below 0 °C. |
| Move on to Step 4 | The result of the active diagnosis is negative | Move on to Step 3 |
| 3 | HEATER PLUGS CHECK | All OK | Problems encountered | Operation |
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| Check that the heater plugs are working properly, by carrying out the See Test 5520CA GLOW PLUGS FUNCTIONAL TEST | Move on to Step 4 | | |
| 4 | ELECTRICAL EQUIPMENT CHECK | All OK | Problems encountered | Operation |
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| Check that the fuses F1 (the last one at the bottom of the vertical row) and F20 (the first one on the right of the lower row) have not blown | Move on to Step 6 | Fuse F1 has blown | Restore the connections or, if necessary, replace the junction unit in the engine compartment Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| Fuse F20 has blown | Move on to Step 5 |
| 5 | TURBOCHARGER SEAL CHECK | All OK | Problems encountered | Operation |
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| Check the circuit for the protective fuse for the diesel preheating relay, conduct See Test 5505AB CHECK DIESEL PREHEATING RELAY PROTECTIVE FUSE | Move on to Step 6 | | |
| 6 | DIESEL PREHEATING RELAY CHECK | All OK | Problems encountered | Operation |
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| Check the diesel preheating relay circuit, conductSee Test 5505AC CHECK DIESEL PREHEATING RELAY | Move on to Step 7 | | |
| 7 | CYLINDER COMPRESSION CHECK | All OK | Problems encountered | Operation |
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| Carry out the cylinder compression check Op. 0510A10 CYLINDER COMPRESSION - CHECK FOR LOOSE SPARK PLUGS OR INJECTORS | Move on to Step 10 | Cylinder compression insufficient | Move on to Step 8 |
| 8 | 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 9 | Cylinder head tightening incorrect | Proceed with the removing-refitting of the cylinder head and renew the correct tightening Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET |
| Gasket damaged | Change the head gasket Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET |
| Oil seal missing | Replace the valve oil seals Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL |
| 9 | CHECK THE CAUSE OF THE INSUFFICIENT COMPRESSION | All OK | Problems encountered | Operation |
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| With the cylinder head removed, check:- valve seal- cylinder/piston ring wear conditions | Move on to Step 10 | Valve seal insufficient | Overhaul cylinder head Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL |
| Cylinder/ring wear outside tolerances | Restore correct operating clearance |
| 10 | 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 that there are no obstructions in the separator or in the pipes | Move on to Step 11 | Fault in the pipe from separator to intake | Restore circuit to working order: change the pipe if necessary |
| Fault in the separator (tappet cover) | Restore circuit to working order: if necessary, replace the tappet cover |
| 11 | TURBOCHARGER SEAL CHECK | All OK | Problems encountered | Operation |
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| Check that there are no engine oil leaks from the turbocharger impeller shaft | End of diagnosis | Gasket seal insufficient | Change the turbocharger Op. 1064A27 TURBOCHARGER UNIT AND EXHAUST MANIFOLD - R.R. |