3233018 - D05 ENGINE DOES NOT PRODUCE BEST PERFORMANCE

The engine runs smoothly at medium-low speeds, but does not reach iits usual maximum performance (both in terms of speed and acceleration)
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation

Check, in order:

  • the condition of the air intake circuit
  • no faults in the air filter;
  • seal of the diesel pipes;
  • accelerator pedal travel;
  • that there no obstructions in the exhaust system
 Continue to Step 1 Fault in air intake circuitRepair the air intake circuit
Air filter blocked Replace the filter element Op.   1048A14 
Leaks from the diesel pipesstop the leak
Accelerator pedal travel incompleteEliminate the cause of the problem
Exhaust system obstructedReplace the defective system component
1CHECK TURBOCHARGER ADJUSTMENTAll OKProblems metOperation
With the diagnostic equipment, carry out active diagnosis on the turbocharger regulating solenoid Check the operation of the variable geometry control actuator by carrying out the test See Test   1064BC  Variable geometry turbocharger actuator leakage test Check the operation of the turbocharger as described in the Test See Test   1064BA  Check turbo pressure control solenoid (Pierburg) efficiency Continue to Step 2 Solenoid not working Check the continuity of the wiring See   E5050  DIESEL ENGINES ELECTRONIC MANAGEMENT and if necessary replace the solenoid Op. 1064A28
Actuator does not work correctly Check the condition of the vacuum circuit and, if necessary, replace the damaged components
Turbocharger faulty Replace the turbocharger Op.   1064A24 
2CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect the diagnostic equipment to the diagnostic socket.

Check:

  • for errors in the control unit
  • plausibility of parameters;
  • carry out active diagnosis of E.G.R. solenoid
 Continue to Step 3 An error is detected in the control unitContinue following the instructions for the diagnostic equipment
unreliable parametersContinue following the instructions for the diagnostic equipment
E.G.R. solenoid not working Check wiring continuity See   E5050  DIESEL ENGINES ELECTRONIC MANAGEMENT
E.G.R. solenoid not working Replace the solenoid valve Op.   1080C74 
3ROAD TEST WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Road test the vehicle keeping the diagnostic instrument connected.
Make sure that the conditions in which the problem occurs are reproduced

check

  • for errors in the control unit
  • plausibility of all the parameters
 Continue to Step 4 Errors suddenly occur in the control unitContinue following the instructions for the diagnostic equipment
Parameters off scaleContinue following the instructions for the diagnostic equipment
Lack of dialogue with the control unit Restore the connection between engine management control unit and diagnostic connector See   E5050  DIESEL ENGINES ELECTRONIC MANAGEMENT
4CHECK ON BRAKE PEDAL SWITCHAll OKProblems metOperation
Check that the brake pedal switch is working properly Continue to Step 5 Brake pedal does not returnEliminate the cause of the sticking
Switch stuck in closed position Replace the switch Op.   1060G38 
Wiring short circuitedRestore the correct connection
5HIGH 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 13 Pressure not correct Continue to Step 6
6CHECK 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 7 Pressure above maximum limit: return pipe to tank blockedRepair the pipe, if necessary, replace it.
7LOW SUPPLY PRESSURE CHECKAll OKProblems metOperation
Check as described the test See Test   1060B  Check low pressure fuel circuit that the diesel pressure between filter and pressure pump is between 2 and 3 bar Continue to Step 13 Pressure below minimum limit or above maximum value Continue to Step 8
8LOW SUPPLY PRESSURE CHECKAll OKProblems metOperation
Choke the return pipe and repeat the test See Test   1060B  Check low pressure fuel circuit with the pipe choked, checking that the pressure at the filter outlet remains below 2 bar Continue to Step 9 Pressure rises to 5 bar: blocked pressure regulation valve on filter support Replace the valve Op.   1044B16 
9CHECK DELIVERY LOW PRESSUREAll OKProblems metOperation
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.   1044B20 
10LOW SUPPLY PRESSURE CHECKAll OKProblems metOperation
Check that the pressure downstream of the supply pump is over 2.2 bar Continue to Step 13 Pressure below 2 bar Continue to Step 11
11LOW SUPPLY PRESSURE CHECKAll OKProblems metOperation
Measure the difference in pressure between the electric pump outlet and filter inlet, checking that it is less than 0.3 bar Continue to Step 12 Difference in pressure greater than 0.3 barReplace the pipe
12LOW 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 13 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
13CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Replace the DRV pressure regulating valve and check that the fault is no longer presentEnd of diagnosisFault persists Continue to Step 14
14
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