125000465 - B20 ENGINE STARTS, AND CUTS OUT STRAIGHT AWAY
The engine starts normally, though possibly with difficulty, then suddenly stalls| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
Check the following, in order:
| Move on to Step 1 1 | Water, other fluids or dirt in the fuel filter | 1. Replace the filter element Op. Op. 1044B20 FUEL FILTER FILTERING ELEMENT - REPLACE | |
| Water, other fluids or dirt in the fuel tank | 2. Clean tank | |||
| 3. Obstructions in the exhaust system | 3. Replace the damaged system component | |||
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
| Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Re-create the conditions under which the fault occurs and check:
| Move on to Step 2 1 | Errors detected in control unit | Continue following the instructions for the diagnostic equipment | |
| Parameters not plausible | Continue following the instructions for the diagnostic equipment | |||
| No communication with the control unit | Restore the correct connections See See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT | |||
| 2 | HIGH PRESSURE CHECK | All OK | Problems encountered | Operation |
| With the diagnostic equipment connected to the diagnostic socket, check as described in the Test See Test 1060D ELECTRONIC DIESEL INJECTION CONTROLthat the diesel pressure parameter is correct | Move on to Step 10 1 | Pressure not correct | Move on to Step 3 1 | |
| 3 | LOW RETURN PRESSURE CHECK | All OK | Problems encountered | Operation |
| Check as described in the Test See Test 1060A LOW RETURN FUEL PRESSURE CIRCUIT CHECKthat the pressure in the return pipe to the tank is less than 1 bar. | Move on to Step 4 1 | Pressure greater than maximum limit (return pipe to tank blocked) | Repair the pipe and replace if necessary | |
| 4 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
| Check as described in the Test See Test 1060B LOW FUEL PRESSURE SUPPLY CIRCUIT CHECKthat the diesel pressure between the filter and radial jet pump is between 2 and 3 bar. | Move on to Step 10 1 | Pressure below the minimum limit or above the maximum limit | Move on to Step 5 1 | |
| 5 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
| Constrict the return pipe downstream of the low pressure regulation valve and carry out the Test again See Test 1060B LOW FUEL PRESSURE SUPPLY CIRCUIT CHECKwith the pipe constricted, checking that the filter outlet pressure remains below 2 bar | Move on to Step 6 1 | Pressure rises to 5 bar: pressure regulator valve on filter mounting incorrectly adjusted | Replace the valve Op. Op. 1044B16 DELIVERY ADJUSTMENT VALVE - R R | |
| 6 | 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 7 1 | Difference in pressure more than 1 bar | Replace the fuel filter cartridge Op. Op. 1044B20 FUEL FILTER FILTERING ELEMENT - REPLACE | |
| 7 | 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 10 1 | Pressure below 2,2 bar | Move on to Step 8 1 | |
| 8 | 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 9 1 | Difference in pressure more than 0,3 bar | Replace the pipe | |
| 9 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
| Check, as described in , that the pump supply voltage is equal to 12 volt and that the current absorbed is between 2 and 10 Ampere | Move on to Step 10 1 | Voltage lower than 12 volts | Check the wiring at the connection leads See See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT | |
| Current greater than 10 Amps: pump defective | Replace the fuel pump assembly Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R | |||
| Current less than 2 Amps: Jet pump blocked | Replace the fuel pump assembly Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + Rand clean the tank | |||
| 10 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
| Replace the DRV high pressure regulator and check that the fault is no longer present | End of diagnosis | Fault persists | Move on to Step 11 1 | |
| 11 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
| Replace the high pressure pump and check that the fault is no longer present | End of diagnosis | Fault persists: control unit defective | Replace the engine management control unit Op. Op. 1060G80 DS ELECTRIC INJECTION CONTROL UNIT - R R | |