| | 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. Accelerator pedal. Accelerator position 1 AD/C. Accelerator position 2 AD/C See Test 1068AC ACCELERATOR PEDAL CHECKS. Target Diesel pressure. Measured Diesel pressure See Test 1060GH DIESEL FUEL PRESSURE CHECK. Engine rpm See Test 1060GI ENGINE SPEED CHECK. Measured air mass See Test 1060GG MEASURED AIR MASS CHECK. Engine coolant temperature See Test 1060OE CHECK ON OPERATION OF COOLANT TEMPERATURE SENSOR | Move on to Step 2 | | |
| 2 | PREHEATING RELAY ACTIVE DIAGNOSIS | 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 | DIESEL PREHEATING FUSE CHECK | All OK | Problems encountered | Operation |
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| Check the circuit for the protective fuse for the diesel preheating relay, by carrying out the 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, by carrying out theSee Test 5505AC CHECK DIESEL PREHEATING RELAY | End of diagnosis | | |
| 7 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| Carry out the active diagnosis for the E.G.R. solenoid valve | Move on to Step 8 | Solenoid valve not working | Restore the wiring continuity See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENTReplace the solenoid valve if necessary Op. 1080C24 E.G.R. SYSTEM SOLENOID - R + R |
| 8 | FUEL FILTER CHECK | All OK | Problems encountered | Operation |
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| Check fuel filter operation | Move on to Step 9 | Water, petrol, paraffin or dirt found to be present | Clean the tank and pipes and replace the diesel filter cartridge Op. 1044B20 FUEL FILTER FILTERING ELEMENT - REPLACE |
| 9 | VALVE CLEARANCE CHECK | All OK | Problems encountered | Operation |
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| Check that the tappet clearance is correct Op. 1036H10 VALVE TAPPETS - CHECK AND ADJUST CLEARANCE, IF NECESSARY | Move on to Step 10 | Valve clearance not correct | Adjust the tappets |
| 10 | CYLINDER COMPRESSION CHECK | All OK | Problems encountered | Operation |
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| Carry out the cylinder compression checkOp. 0520G15 COMPRESSION TEST - CHECK WITH EXAMINER WITH SPARK PLUGS/INJECTORS REMOVED | Move on to Step 12 | Cylinder compression insufficient | Move on to Step 11 |
| 11 | CHECK ON CAUSE OF INSUFFICIENT COMPRESSION | All OK | Problems encountered | Operation |
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| Carry out Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKETto check the valve seal and check the condition of the cylinders/piston rings | Move on to Step 12 | Valve seal insufficient | Overhaul the cylinder head Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL |
| 12 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
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| Check that the fault is no longer present | End of diagnosis | Fault persists | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R |