| STEP | OPERATIONS TO BE CARRIED OUT | TEST RESULTS |
|---|
| 0 | PRELIMINARY CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Turn the key to the ON position and check that the CODE is working properly Then check:- that the inertia switch has not been operated;
- presence of fuel in the tank;
- air intake circuit;
- correct operation of the flow modification valve;
- correct operation of the exhaust manifolds.
- that there are no leaks or seepage from the high and low pressure fuel pipes
| Move on to Step | 1. CODE failure message present | 1. Continue following the instructions in the Table Continue following the instructions in the table K52 CODE FAILURE WARNING LIGHT ON |
| 2. Intertia switch operated | 2. Restore correct operation |
| 3. Lack of fuel | 3. Add fuel to the tank |
| 4. Filter dirty or partly blocked | 4. Replace the filter element See in Op. 1048A14 air cleaner filtering element - replace. |
| 5. Flow modulation valve working incorrectly | Move on to Step |
| 6. Exhaust blocked | 6. Restore exhaust manifolds to working order |
| 7. Presence of leaks | 7. Eliminate leaks |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Carry out active diagnosis of flow modification valve | Move on to Step | Solenoid valve not working | Check continuity of wiring, if necessary, replace solenoid valve See in Op. 1060G56 SOLENOID VALVE ON VACUUM RESERVOIR FOR PNEUMATIC VALVE - R.R. |
| 2 | FLOW MODIFICATION VALVE ACTUATOR CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check operation of the pneumatic actuator | Move on to Step | Actuator not working | Replace electro-pneumatically controlled throttle casing See in Op. 1060G52 PNEUMATICALLY CONTROLLED THROTTLE CASING - REPLACE |
| 3 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Check:- no errors in control unit
- parameter plausibility
| Move on to Step | 1. Error detected in the control unit | 1. Continue following the instructions for the diagnostic equipment |
| 2. Parameters not plausible | 2. Continue following the instructions for the diagnostic equipment |
| 3. No communication with the control unit | 3. Restore the connection between the engine control unit and the diagnostic connector |
| 4 | HIGH PRESSURE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Check, as described in test 1060D, that the diesel pressure parameter is correct. | Move on to Step | Pressure not correct | Move on to Step |
| 5 | INJECTOR HIGH PRESSURE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check, as described in procedure 1060C, that the leaks of diesel from the injector recirculation connections are only slight and about the same as one another. | Move on to Step | Persistent leak from one injector | Replace the injector |
| 6 | LOW RETURN PRESSURE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check, as described in test 1060A, that the pressure in the return pipe to the tank is less than 1 bar | Move on to Step | Pressure above the maximum limit: return pipe to the tank obstructed | Repair the pipe, if necessary, replace it |
| 7 | LOW SUPPLY PRESSURE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check, as described in test 1060B, that the diesel pressure between the filter and the pressure pump is between 2 and 3 bar | Move on to Step | Pressure below the minimum limit or above the maximum limit | Move on to Step |
| 8 | LOW SUPPLY PRESSURE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Constrict the return pipe, downstream of the valve, and carry out test 1060B again with the pipe constricted checking that the pressure at the filter outlet stays below 2 bar | Move on to Step | Pressure rises to 5 bar: pressure regulator valve on filter mounting incorrectly adjusted | Replace the valve See in Op. 1044B16 Fuel supply/return adjustment valve on fuel filter - R.R. |
| 9 | LOW SUPPLY PRESSURE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the difference in pressure upstream and downstream of the filter is less than 1 bar | Move on to Step | Difference in pressure more than 1 bar | Replace the fuel filter cartridge See in Op. 1044B20 fuel filter filtering element - replace |
| 10 | CHECK LOW SUPPLY PRESSURE | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the supply pump pressure at the filter inlet is more than 2.2 bar | Move on to Step | Pressure below 2.2 bar | Move on to Step |
| 11 | LOW SUPPLY PRESSURE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| 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 | Difference in pressure more than 0.3 bar | Replace the pipe |
| 12 | LOW SUPPLY PRESSURE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check, as decribed in test 1040AA, that the pump supply voltage is equal to 12V and that the current absorption is between 2 and 10 Ampere | Move on to Step | 1. Voltage < 12 volt | 1. Check electrical wiring (Wiring Diagram ) E5050 DIESEL ENGINE ELECTRONIC MANAGEMENT |
| 2. Current > 10 Amps: pump defective | 2. Replace the fuel pump assembly See in Op. 1040A70 SUBMERGED PUMP ASSEMBLY complete with level gauge - R.R. |
| 3. Current < 2 Amps: pump obstructed | 3. Replace the fuel pump assembly and clean the fuel tank See in Op. 1040A70 SUBMERGED PUMP ASSEMBLY complete with level gauge - R.R. |
| 13 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Replace the DRV high pressure regulation valve and check that the fault is no longer present. | | Fault persists | Move on to Step |
| 14 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Replace the pressure pump and check that the fault is no longer present | | Fault persists | Contact the Service Department for further information on the problem |
| 15 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Replace the engine management control unit and check that the fault is no longer present | | Fault persists | Contact the Service Department for further information on the problem |
