|  |  | Results of the tests | 
| 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 NECESSARY  Check 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 CHECK | Move on to Step 1 | Oil level incorrect | Restore the correct 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. Objective 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 | PARTICLE FILTRATION SYSTEM CHECKS | All OK | Problems encountered | Operation | 
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|  | Check that the DPF system is working properly    See Test 1080BE PARTICULATE FILTER SATURATION CHECK | 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 F1 fuse has not blown (it is the last one at the bottom of the vertical row) | 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  ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. | 
| 6 | HIGH PRESSURE CHECK | All OK | Problems encountered | Operation | 
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|  | Connect the diagnostic equipment to the diganostic socket. Check as described in the    See Test 1060OD INSPECTION OF THE HIGH PRESSURE FUEL CIRCUITthat the diesel pressure parameter is correct | Move on to Step 14 | Pressure not correct | Move on to Step 9 | 
| 7 | LOW RETURN PRESSURE CHECK | All OK | Problems encountered | Operation | 
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|  | Check as described in the    See Test 1060OA CHECK ON RETURN LOW PRESSURE FUEL CIRCUITthat the pressure in the return pipe to the tank is less than 1 bar | Move on to Step 8 | Pressure above the maximum limit: return pipe to the tank obstructed | Repair the pipe, if necessary, replace it | 
| 8 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation | 
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|  | Check as described in the    See Test 1060OB CHECK ON SUPPLY LOW PRESSURE FUEL CIRCUITthat the diesel pressure between the filter and the pressure pump is between 2 and 3 bar | Move on to Step 14 | Pressure below the minimum limit or above the maximum limit | Move on to Step 9 | 
| 9 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation | 
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|  | Constrict the return pipe from the pressure relief valve and carry out the test again    See Test 1060OB CHECK ON SUPPLY LOW PRESSURE FUEL CIRCUITwith the pipe constricted, checking that the filter outlet pressure remains below 2 bar | Move on to Step 10 | Pressure rises to 5 bar: pressure regulator valve on filter mounting incorrectly adjusted | Replace the valveSee Test 1044B16 | 
| 10 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation | 
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|  | Check that the difference in pressure upstream and downstream of the filter is less than 1 bar | Move on to Step 11 | Difference in pressure more than 1 bar | Replace the diesel filter cartridgeSee Test 1044B20 | 
| 11 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation | 
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|  | Check that the supply pump pressure at the filter inlet is more than 2.2 bar | Move on to Step 14 | Pressure below 2 bar | Move on to Step 12 | 
| 12 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation | 
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|  | Measure the difference in pressure between the electrical pump outlet and the filter inlet checking that it is less than 0.3 bar | Move on to Step 15 | Difference in pressure more than 0.3 bar | Replace the pipe | 
| 13 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation | 
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|  | Check as described in the    See Test 1040AA SUPPLY VOLTAGE AND ABSORPTION CURRENT CHECKS that the pump supply voltage is equal to 12V and that the current uptake is between 2 and 10 A | Move on to Step 14 | Voltage lower than 12 V | Check electrical wiring    See E5050  DIESEL ENGINES ELECTRONIC MANAGEMENT | 
| Current greater than 10 A: pump defective | Replace the fuel pump | 
| Current less than 2 A: pump obstructed | Replace the fuel pumpand clean the fuel tank | 
| 14 | CHECK CORRECT OPERATION | All OK | Problems encountered | Operation | 
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|  | Replace the DRV high pressure valve    Op. 1060E50  PRESSURE REGULATOR ON PRESSURE PUMP - R.R. and check that the fault is no longer present | End of diagnosis | Fault persists | Move on to Step 15 | 
| 15 | CHECK CORRECT OPERATION | All OK | Problems encountered | Operation | 
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|  | Replace the high pressure pump    Op. 1060E10  DIESEL INJECTION PRESSURE PUMP - R.R. and check that the fault is no longer present | End of diagnosis | Fault persists | Move on to Step 16 | 
| 16 | CYLINDER COMPRESSION CHECK | All OK | Problems encountered | Operation | 
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|  | Carry out the cylinder compression check    Op. 0520G15 COMPRESSION TEST - CHECK WITH EXAMINER WITH SPARK PLUGS/INJECTORS REMOVED | Move on to Step 18 | Cylinder compression insufficient | Move on to Step 17 | 
| 17 | 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 GASKET to check the seal of the valves. Check the condition of the cylinders/flexible bands | Move on to Step 18 | Valve seal insufficient | Overhaul the head    Op. 1016E10  SINGLE CYLINDER HEAD, REMOVED - OVERHAUL | 
| Cylinders/piston rings worn | Restore the seal | 
| 18 | 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 |