| | Test results |
| 1 | MODE PARAMETERS CHECK | All OK | Problems encountered | Operation |
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| Select the following control unit at the diagnostic equipment: Marelli Diesel Injection 6F3 EOBD CAN (EP engine 1.3 JTD).Check the value of the following parameter:- Battery voltage See Test 5530BB BATTERY VOLTAGE CHECK | Move on to Step 2 | | |
| 2 | POWER SUPPLY CIRCUIT CHECK | All OK | Problems encountered | Operation |
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| Check there are no faults in the fuel supply circuit See Test 1040OA FUEL SUPPLY CIRCUIT CHECK | Move on to Step 3 | | |
| 3 | HIGH PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Connect the diagnostic equipment to the diagnostic socket.Check that the diesel pressure parameter is correct as described in the test. See Test 1060OD HIGH PRESSURE FUEL CIRCUIT CHECK | Move on to Step 10 | Pressure not correct | Move on to Step 4 |
| 4 | LOW RETURN PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Check, as described in the test , that the pressure in the return pipe to the tank is less than 1 bar See Test 1060OA LOW FUEL RETURN PRESSURE CIRCUIT CHECK | Move on to Step 5 | Pressure above the maximum limit: return pipe to the tank obstructed | Repair the pipe; if necessary, replace it |
| 5 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Check, as described in the test, that the diesel pressure between the filter and the pressure pump is between 2 and 3 bar See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECK | Move on to Step 10 | Pressure below the minimum limit or above the maximum limit | Move on to Step 6 |
| 6 | 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 7 | Difference in pressure more than 1 bar | Replace the diesel filter cartridge Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE |
| 7 | 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 10 | Pressure below 2 bar | Move on to Step 8 |
| 8 | 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 9 | Difference in pressure more than 0.3 bar | Replace the pipe |
| 9 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Check, as described in the test, that the pump supply voltage is equal to 12 V and that the current uptake is between 2 and 10 A See Test 1040AA CHECK ON SUPPLY VOLTAGE AND CURRENT UPTAKE | Move on to Step 10 | 1. Voltage lower than 12 V2. Current greater than 10 A: pump defective3. Current less than 2 A: pump obstructed | 1. Check electrical wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT 2. Replace the fuel pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R 3. Replace the fuel pump and clean the fuel tank Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R |
| 10 | CHECK CORRECT OPERATION | All OK | Problems encountered | Operation |
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| Replace the high pressure pump and check that the fault is no longer present Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R. | End of diagnosis | Fault persists | Move on to Step 11 |
| 11 | 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 13 | Cylinder compression insufficient | Move on to Step 12 |
| 12 | CHECK ON CAUSE OF INSUFFICIENT COMPRESSION | All OK | Problems encountered | Operation |
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| Check the valve seal. Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET Check condition of cylinders/piston rings | Move on to Step 13 | 1. Valve seal insufficient2. Cylinders/piston rings worn | 1. Overhaul the head Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL 2. Restore the seal |
| 13 | MODE PARAMETERS CHECK | All OK | Problems encountered | Operation |
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| Select the following control unit at the diagnostic equipment: Marelli Diesel Injection 6F3 EOBD CAN (EP engine 1.3 JTD).Check the value of the following parameters:- Engine rpm See Test 1060GA RPM SENSOR EFFICIENCY CHECK- Press. Diesel measured See Test 1060GH DIESEL PRESSURE CHECK | Move on to Step 14 | | |
| 14 | PREHEATING RELAY ACTIVE DIAGNOSIS | All OK | Problems encountered | Operation |
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| Carry out the active diagnosis of 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 16 | The result of the active diagnosis is negative | Move on to Step 15 |
| 15 | GLOW HEATER PLUGS CHECK | All OK | Problems encountered | Operation |
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| Check that the glow heater plugs are working properly See Test 5520CA CHECK GLOW PLUG OPERATION | Move on to Step 16 | | |
| 16 | CORRECT OPERATION CHECK | 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.R |