| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|
| Check that, at the same time as this error, there are none of the following errors present:- P0401- P0402- P0403 | Move on to Step 1 | At least one of the errors indicated is present | This error may be caused by a malfunction of the EGR, therefore it is subordinate to the other errors: continue as instructed by the diagnostic equipment relating to the other errors present |
| 1 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|
| Check that the air intake/vacuum circuit is working properly See Test 1048OA AIR INTAKE/VACUUM CIRCUIT CHECKSelect 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:. Atmospheric pressure See Test 1060GD ATMOSPHERIC PRESSURE CHECK- Supercharging pressure measured See Test 1060GF SUPERCHARGING PRESSURE CHECK | Move on to Step 2 | | |
| 2 | HIGH PRESSURE CHECK | All OK | Problems encountered | Operation |
|---|
| Check that the diesel pressure parameter is correct | Move on to Step 12 | Pressure not correct | Move on to Step 3 |
| 3 | INJECTOR HIGH PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Check that the diesel leaks from the injector recirculation connections are small (seepage) and roughly equal to one another See Test 1060OC INJECTOR SEAL TEST | Move on to Step 4 | Significant leak from one injector | Replace the injector Op. 1060F10 FUEL INJECTORS - R.R. |
| 4 | LOW RETURN PRESSURE CHECK | All OK | Problems encountered | Operation |
|---|
| Check 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 |
|---|
| Check 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 11 | 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 |
|---|
| Constrict the return pipe downstream of the valve and carry out the test once again with the pipe constricted checking that the pressure at the filter outlet remains below 2 bar See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECK | Move on to Step 7 | Pressure rises to 5 bar: pressure regulator valve on filter mounting incorrectly adjusted | Replace the valve |
| 7 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
|---|
| Check that the difference in pressure upstream and downstream of the filter is less than 1 bar | Move on to Step 8 | Difference in pressure more than 1 bar | Replace the fuel filter cartridge Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE |
| 8 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
|---|
| Check that the supply pump pressure at the filter inlet is more than 2.2 bar | Move on to Step 11 | Pressure below 2.2 bar | Move on to Step 9 |
| 9 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
|---|
| Measure the difference in pressure between the electric pump outlet and the filter inlet and check that it is less than 0.3 bar | Move on to Step 10 | Difference in pressure more than 0.3 bar | Replace the pipe |
| 10 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
|---|
| Check that the pump supply voltage is equal to 13 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 11 | 1. Voltage lower than 12 V2. Current out of range: pump defective | 1. Renew 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 |
| 11 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
|---|
| Replace the pressure pump and check that the fault is no longer present Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R. | End of diagnosis | Fault persists | Contact technical service for further information on the problem |
| 12 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
|---|
| Replace the engine management control unit and check that the fault is no longer present Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R | End of diagnosis | Fault persists | Contact technical service for further information on the problem |
