| | 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 See Test 1048OA AIR INTAKE/VACUUM CIRCUIT CHECKCheck the condition of the fuel supply circuit and make sure that it is working properly See Test 1040OA FUEL SUPPLY CIRCUIT CHECKCheck the operation of the low pressure supply circuit See Test 1060OA CHECK ON RETURN LOW PRESSURE FUEL CIRCUIT | Move on to Step 1 | Level irrregular | Restore the correct engine oil level Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | 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. Atmospheric pressure See Test 1060GD ATMOSPHERIC PRESSURE CHECK. Supercharging pressure Objective. Supercharging pressure Measured See Test 1060GF SUPERCHARGING PRESSURE CHECK. Measured air mass See Test 1060GG MEASURED AIR MASS CHECK. Diesel temperature See Test 1060EA DIESEL FUEL TEMPERATURE CHECK. Target Diesel pressure. Measured Diesel pressure See Test 1060GH DIESEL FUEL PRESSURE CHECK. Engine rpm See Test 1060GI ENGINE SPEED CHECK | Move on to Step 2 | | |
| 2 | EGR AND TURBOCHARGER REGULATION 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 that the system is working properly Vedere Prova 5040OB VERIFICA FUNZIONAMENTO IMPIANTO CONDIZIONATORE (PRESSIONI) | Move on to Step 3 | | |
| 3 | 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 5 | The result of the active diagnosis is negative | Move on to Step 4 |
| 4 | 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 5 | | |
| 5 | 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 7 | Fuse F1 has blown | Restore the connections or, if necessary, replace the junction unit in the engine compartment Op. 5505A13 CENTRALINA DI DERIVAZIONE SUPPLEMENTARE NEL VANO MOTORE - S.R. |
| Fuse F20 has blown | Move on to Step 6 |
| 6 | 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, carrying out the See Test 5505AB CHECK DIESEL PREHEATING RELAY PROTECTIVE FUSE | Move on to Step 7 | | |
| 7 | DIESEL PREHEATING RELAY CHECK | All OK | Problems encountered | Operation |
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| Check the diesel preheating relay circuit, carrying out theSee Test 5505AC CHECK DIESEL PREHEATING RELAY | Move on to Step 8 | | |
| 8 | EGR AND TURBOCHARGER REGULATION CHECK | All OK | Problems encountered | Operation |
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| Keep the diagnotsic equipment connected to the diagnostic socket.Carry out the active diagnosis of the EGR solenoid valveCarry out the active diagnosis for the turbocharger regulation solenoid valveCheck the operation of the variable geometry control actuator, carrying out the See Test 1064BC VARIABLE GEOMETRY TURBOCHARGER ACTUATOR SEAL TEST | Move on to Step 9 | EGR 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 |
| Turbo regulator solenoid valve not working | Restore the wiring continuity See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENTReplace the solenoid valve if necessary Op. 1064B42 SOLENOID CONTROLLING TURBOCHARGER VANE POSITION ACTUATOR - R.R |
| Actuator not working properly | Check the condition of the vacuum circuit, if necessary, replace the damaged components |
| 9 | TURBOCHARGER CHECK | All OK | Problems encountered | Operation |
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| Check as described in the See Test 1064BA SUPRECHARGING PRESSURE CHECKthe operation of the turbocharger | Move on to Step 10 | Turbocharger faulty | Replace the turbocharger unit Op. 1064A27 TURBOCHARGER UNIT AND EXHAUST MANIFOLD - R.R. |
| 10 | 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 control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R |