3233008 - B20 ENGINE STARTS, AND CUTS OUT STRAIGHT AWAY
The engine starts, with difficulty and then immediately cuts out suddenly| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation |
|---|---|---|---|---|
Check, in order:
| Continue to Step 1 | There is water, other fluids or dirt in the fuel filter | Replace the filter element | |
| There is water, other fluids or dirt in the fuel tank | Cleaning tank | |||
| Obstructions in the drainage system | Replace the damaged system component | |||
| 1 | CHECKING WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
| Connect
the diagnostic equipment to the diagnostic socket. Recreate the conditions in which the problem occurs and check:
| Continue to Step 2 | Errors detected in the control unit | Continue following the instructions for the diagnostic equipment | |
| unreliable parameters | Continue following the instructions for the diagnostic equipment | |||
| Lack of dialogue with the control unit | Restore the correct connections See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT | |||
| 2 | HIGH PRESSURE CHECK | All OK | Problems met | Operation |
| With the diagnostic equipment connected to the diagnostic socket, check as described in the test See Test 1060D Check high pressure fuel circuit that the diesel pressure parameter is correct | Continue to Step 10 | Pressure not correct | Continue to Step 3 | |
| 3 | CHECK ON RETURN LOW PRESSURE | All OK | Problems met | Operation |
| Check as described in the test See Test 1060A Check low pressure fuel circuit that the pressure in the return pipe to the tank is under 1 bar | Continue to Step 4 | Pressure above maximum limit (return pipe to tank blocked) | Repair the pipe; if necessary replace it. | |
| 4 | LOW SUPPLY PRESSURE CHECK | All OK | Problems met | Operation |
| Check as described in the Test See Test 1060B Check low pressure fuel circuit that the diesel pressure between filter and radial jet pump is between 2 and 3 bar. | Continue to Step 10 | Pressure below minimum limit or above maximum limit | Continue to Step 5 | |
| 5 | LOW SUPPLY PRESSURE CHECK | All OK | Problems met | Operation |
| Choke the return pipe from the pressure regulating valve and repeat the test See Test 1060B Check low pressure fuel circuit with the pipe choked, checking that the pressure at the filter outlet is below 2 bar | Continue to Step 6 | Pressure rises to 5 bar: blocked pressure regulation valve on filter support | Replace the valve Op. 1044B16 | |
| 6 | LOW SUPPLY PRESSURE CHECK | All OK | Problems met | Operation |
| Check that the difference in pressure upstream and downstream of the filter is less than 1 bar | Continue to Step 7 | Difference in pressure over 1 bar | Replace the fuel filter cartridge Op. 1044B16 | |
| 7 | LOW SUPPLY PRESSURE CHECK | All OK | Problems met | Operation |
| Check that the pressure of the supply pump at the filter inlet is over 2.2 bar | Continue to Step 10 | Pressure below 2.2 bar | Continue to Step 8 | |
| 8 | LOW SUPPLY PRESSURE CHECK | All OK | Problems met | Operation |
| Measure the difference in pressure between electric pump outlet and filter inlet and check that it is less than 0.3 bar | Continue to Step 9 | Difference in pressure over 0.3 bar | Replace the pipe | |
| 9 | LOW SUPPLY PRESSURE CHECK | All OK | Problems met | Operation |
| Check as described in the Test See Test 1040AA Check supply voltage and absorption current that the pump's supply voltage is 12V and that the absorbed current is between 2 and 10 amps. | Continue to Step 10 | Voltage below 12 V | Check wiring, intervention on connection cables See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT | |
| Current greater than 10 amp.: pump faulty | Replace the fuel pump assembly Op. 1040A70 | |||
| Current below 2 amp.: jet pump blocked | Replace fuel pump assembly Op. 1040A70 and clean the fuel tank | |||
| 10 | CHECK ON CORRECT OPERATION | All OK | Problems met | Operation |
| Replace the DRV high-pressure regulator and check that the fault is no longer present | End of diagnosis | Fault persists | Continue to Step 11 | |
| 11 | CHECK ON CORRECT OPERATION | All OK | Problems met | Operation |
| Replace the pressure pump and check that the fault is no longer present | End of diagnosis | Fault persists: control unit faulty | Replace engine management control unit Op. 1060G80 | |