3233006 - B13 ENGINE STARTS WITH DIFFICULTY'

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Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation

Check, in order:

  • that there are no obstructions in the air filter;
  • the condition of the air intake circuit
  • seal of the diesel pipes;
  • that there is no petrol, water, paraffin or dirt in the diesel filter.
  • the correct operation of the exhaust pipes.
Continue to Step 1 Air intake circuit componentRepair or replace the defective component
Filter blocked Replace the air filter Op.   1048A10 
Leaks from the diesel pipes Retighten the pipes, and if necessary replace them.
Presence of water, petrol, paraffin or dirt detected Clean the tank and pipes and replace the diesel filter cartridge Op.   1044B20 
Obstruction in the exhaust systemReplace the damaged system component
1CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect the diagnostic equipment to the diagnostic socket.

Check:

  • for errors in the control unit
  • plausibility of all the parameters
Continue to Step 2 An error is detected in the control unitContinue following the instructions for the diagnostic equipment
unreliable parametersContinue following the instructions for the diagnostic equipment
2HIGH PRESSURE CHECKAll OKProblems metOperation
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 10 Pressure not correct Continue to Step 3
3CHECK ON RETURN LOW PRESSUREAll OKProblems metOperation
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 blockedRepair the pipe; if necessary replace it
4LOW SUPPLY PRESSURE CHECKAll OKProblems metOperation
Check as described in the test See Test   1060B  Check low pressure fuel circuit that the diesel pressure between the filter and pressure pump is between 2 and 3 bar Continue to Step 10 Pressure below minimum limit or above maximum limit Continue to Step 5
5LOW SUPPLY PRESSURE CHECKAll OKProblems metOperation
Close the return pipe downstream of the low pressure regulator valve, located in the fuel filter cover, using the special tool and carry out the test See Test   1060B  Check low pressure fuel circuit again with the pipe closed, checking that the filter outlet pressure remains below 2 bar Continue to Step 6 Pressure rises to 5 bar: blocked pressure regulation valve on filter supportReplace the diesel filter cover
6LOW SUPPLY PRESSURE CHECKAll OKProblems metOperation
Check that the difference in pressure upstream and downstream of the filter is less than 1 bar Continue to Step 7 Difference in pressure greater than 1 barReplace the diesel filter cartridge
7LOW SUPPLY PRESSURE CHECKAll OKProblems metOperation
Check that the supply pump pressure at the filter inlet is over 2.2 bar Continue to Step 10 Pressure below 2 bar Continue to Step 8
8LOW SUPPLY PRESSURE CHECKAll OKProblems metOperation
Measure the difference in pressure between electric pump outlet and filter inlet, checking that it is less than 0.3 bar Continue to Step 9 Difference in pressure greater than 0.3 barReplace the pipe
9LOW SUPPLY PRESSURE CHECKAll OKProblems metOperation
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 < 12 V Check electric wiring See   E5050  DIESEL ENGINES ELECTRONIC MANAGEMENT
Current > 10 Amp: pump defective Replace the fuel pump assembly Op.   1040A70 
Current < 2 Amp.: pump blocked Replace the fuel pump assembly Op.   1040A70  and clean the fuel tank
10CORRECT OPERATION CHECKAll OKProblems metOperation
Replace the DRV high-pressure regulator and check that the fault is no longer presentEnd of diagnosisFault persists Continue to Step 11
11CORRECT OPERATION CHECKAll OKProblems metOperation
Replace the pressure pump and check that the fault is no longer presentEnd of diagnosisFault persists Continue to Step 12
12CHECK ON CYLINDER COMPRESSIONAll OKProblems metOperation
Carry out the cylinder compression test Continue to Step 14 Cylinder compression insufficient Continue to Step 13
13CHECK ON CAUSE OF INSUFFICIENT COMPRESSIONAll OKProblems metOperation
Carry out R.R. on head to check the valve sealCheck the condition of the cylinders/piston rings Continue to Step 14 Insufficient valve seal Overhaul the cylinder head Op.   1016E10 
Cylinders/piston rings wornRepair the leak
14CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persists: control unit faulty Replace engine management control unit Op.   1060G80