| | Test results |
| 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. Engine rpm See Test 1060GI ENGINE SPEED CHECK. Target Diesel pressure. Measured Diesel pressure See Test 1060GH DIESEL FUEL PRESSURE CHECK | Move on to Step 2 | | |
| 2 | CONFIGURATION TESTS | 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 in the Configurations section whether the replacement of any of the following components was not followed by the subsequent configuration:. Flow meter. Fuel pressure sensor. Injector. Differential pressure sensor on the catalytic converter. Lambda sensor. Main catalytic converter with filter. Pre-catalyzerIn this case, carry out the configuration checking that the outcome is positive | Move on to Step 4 | The outcome of the configuration is not positive | Move on to Step 3 |
| 3 | CONFIGURATION REPETITION | All OK | Problems encountered | Operation |
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| Repeat the configuration, check that the outcome is positive this time | Move on to Step 4 | The outcome of the configuration is not positive | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R |
| 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. | The check on the following system is only necessary if the outside temperature is below 0 °C. |
| 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, 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, carrying out theSee Test 5505AC CHECK DIESEL PREHEATING RELAY | Move on to Step 7 | | |
| 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 check Op. 0510A10 CYLINDER COMPRESSION - CHECK FOR LOOSE SPARK PLUGS OR INJECTORS | Move on to Step 12 | Cylinder compression insufficient | Move on to Step 11 |
| 11 | CHECK THE CAUSE OF THE 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 |