184000406 - 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 | Clean tank | |||
| Obstructions in the drainage system | Replace the damaged system component | |||
| 1 | CHECK WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
| Connect the diagnostic equipment (Examiner or other instruments) 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 | CHECK FLOW METER | All OK | Problems met | Operation |
| Check the condition of the flow meter and the pipes connected to it. | Continue to Step 3 | Pipes damaged | Repair the pipe; if necessary replace it | |
| 3 | EGR SOLENOID VALVE CHECK | All OK | Problems met | Operation |
| Check it is working properly. without sticking or intermediate stops. for the solenoid valve.(This can be done by removing the valve from its position and releasing it from the pipes, leaving the electrical connection, however, in place; at this point, operate the active diagnosis stage using the EXAMINER to check that it is working properly) | Continue to Step 4 | Solenoid valve damaged | Repair the solenoid valve and, if necessary, replace it Op. 1080C24 | |
| 4 | THROTTLE SOLENOID VALVE CHECK | All OK | Problems met | Operation |
| Check it is working properly. without sticking or intermediate stops. for the solenoid valve.(This can be done by removing the valve from its position and releasing it from the pipes, leaving the electrical connection, however, in place; at this point, operate the active diagnosis stage using the EXAMINER to check that it is working properly) | Continue to Step 5 | Solenoid valve damaged | Repair the solenoid valve and, if necessary, replace it Op. 1060G72 | |
| 5 | HIGH PRESSURE CHECK | All OK | Problems met | Operation |
| Connect the diagnostic equipment 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 13 | Pressure too high | Continue to Step 8 | |
| Pressure too low | Replace the pressure regulator Op. 1060E50 then continueContinue to Step 5 | |||
| 6 | CHECK ON RETURN LOW PRESSURE | All OK | Problems met | Operation |
| Check as described in the test See Test 1060A Low return fuel pressure circuit check that the pressure in the return pipe to the tank is under 1 bar | Continue to Step 7 | Pressure above maximum limit (return pipe to tank blocked) | Repair the pipe; if necessary replace it. | |
| 7 | LOW SUPPLY PRESSURE CHECK | All OK | Problems met | Operation |
| Check as described in the test See Test 1060B Low fuel pressure supply circuit check that the diesel pressure between filter and radial jet pump is between 2 and 3 bar. | Continue to Step 13 | Pressure below minimum limit or above maximum limit | Continue to Step 8 | |
| 8 | 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 Low fuel pressure supply circuit check with the pipe choked, checking that the pressure at the filter outlet is below 2 bar | Continue to Step 9 | Pressure rises to 5 bar: blocked pressure regulation valve on filter support | Replace the valve Op. 1044B16 | |
| 9 | 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 10 | Difference in pressure greater than 1 bar | Replace the fuel filter cartridge Op. 1044B16 | |
| 10 | LOW SUPPLY PRESSURE CHECK | All OK | Problems met | Operation |
| Check that the supply pump pressure at the filter inlet is over 2.2 bar | Continue to Step 13 | Pressure below 2.2 bar | Continue to Step 11 | |
| 11 | 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 12 | Difference in pressure over 0.3 bar | Replace the pipe | |
| 12 | 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 13 | Voltage < 12 V | Check wiring, intervention on connection cables See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT | |
| Current > 10 Amp: pump defective | 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 | |||
| 13 | CORRECT OPERATION CHECK | 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 14 | |
| 14 | CORRECT OPERATION CHECK | 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 | |