244000454 - D05 ENGINE DOES NOT PRODUCE BEST PERFORMANCE

The engine operates normally at moderate/low speeds but does not achieve its usual performance peaks (in terms of speed and acceleration).
STEPOPERATIONS TO BE CARRIED OUTTEST RESULTS
0PRELIMINARY CHECKSALL OKPROBLEMS ENCOUNTEREDACTION
Check the following, in order:

  • condition of the air intake circuit;
  • that there are no faults in the air filter;
  • the seal of the diesel pipes;
  • no obstructions in the catalytic converter
Move on to Step 1Air intake circuit faultyRepair the air intake circuit
Air filter blockedReplace the filter element    Op. 1048A14 AIR CLEANER FILTERING ELEMENT - REPLACE.
Leaks from diesel pipesEliminate the leaks
Catalytic converter obstructedReplace the catalytic converter    Op. 1080B62 CATALYTIC CONVERTER - R + R
1CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Connect the diagnostic equipment to the diagnostic socket.Check:

  • that there are no errors in the control unit;
  • the plausibility of the parameters;
  • correct accelerator pedal end of travel setting
Move on to Step 2Error detected in the control unitContinue following the instructions for the diagnostic equipment
Parameters not plausibleContinue following the instructions for the diagnostic equipment
Incorrect accelerator pedal settingAdjust accelerator pedal end of travel position
2ROAD TEST USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Carry out a road test keeping the diagnostic equipment connected.
Make sure that the conditions in which the problem occurs are reproduced
Check:

  • that there are no errors in the control unit;
  • parameter plausibility
Move on to Step 3The sudden onset of errors in the control unit is detectedContinue following the instructions for the diagnostic equipment
Parameters off the scaleContinue following the instructions for the diagnostic equipment
No communication with the control unitRestore the connection between the engine management control unit and the diagnostic connector    See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
3BRAKE PEDAL SWITCH CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the brake pedal switch is working properlyMove on to Step 4Brake pedal does not returnEliminate the cause of the sticking
Switch stuck closedReplace the switch
Wiring short circuitedEliminate the cause of the problem
4TURBOCHARGER CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the operation of the turbocharger as described in Test 1064BA.    See Test 1064B CONTROL/SAFETY DEVICESMove on to Step 5Turbocharger faultyReplace the turbocharger
5HIGH PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Connect the diagnostic equipment to the diagnostic socket.Check, as described in Test 1060D, that the diesel pressure parameter is correct.    See Test 1060O DIESEL FUEL INJECTION SUPPLY TESTSMove on to Step 12Pressure not correctMove on to Step 6
6LOW RETURN PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check, as described in Test 1060A, that the pressure in the return pipe to the tank is less than 0.5 bar.    See Test 1060O DIESEL FUEL INJECTION SUPPLY TESTSMove on to Step 7Pressure above the maximum limit: return pipe to the tank obstructedRepair the pipe and replace if necessary
7LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check, as described in Test 1060OB, that the diesel pressure between the filter and the pressure pump is between 0.6 and 0.7 bar.    See Test 1060O DIESEL FUEL INJECTION SUPPLY TESTSMove on to Step 11Pressure below the minimum limit or above the maximum limitMove on to Step 8
Pressure above the maximum limitReplace Bontaz pressure relief valve
8LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the difference in pressure upstream and downstream of the filter is less than 0.2 barMove on to Step 9Difference in pressure more than 1 barReplace the fuel filter cartridge    Op. 1044B20 FUEL FILTER FILTERING ELEMENT - REPLACE
9LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the pressure difference between the electric pump outlet and the filter inlet is less than 0.3 barMove on to Step 10Difference in pressure more than 0.3 barReplace the pipe    Op. 1040B30 FUEL DELIVERY LINE - R R
10PRESSURE REGULATOR ACTIVE DIAGNOSISALL OKPROBLEMS ENCOUNTEREDACTION
Check pressure regulation pump operation while in active diagnosis mode.Move on to Step 11Valve defectiveChange valve    Op. 1060G16 PRESSURE RELIEF SENSOR - R R
11CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Replace the pressure pump and check that the fault is no longer present.    Op. 1060E10 PRESSURE PUMP - R REnd of diagnosisFault persistsRenew the pressure pump and move on to Step 12
12VALVE CLEARANCE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the tappet clearance is correct    Op. 1036H14 VALVE TAPPETS - CHECK CLEARANCEMove on to Step 13Valve clearance not correctReplace tappets    Op. 1036H57 HYDRAULIC TAPPETS ALL R R
13ENGINE CYLINDER HEAD CHECKSALL OKPROBLEMS ENCOUNTEREDACTION
R/R head for valve leakage test    Op. 1016C10 SINGLE CYLINDER HEAD, REMOVED - OVERHAULCheck condition of cylinders/piston ringsMove on to Step 14Valve seal insufficientRestore the seal
Cylinders/piston rings wornOverhaul the cylinder head    Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
14CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Check that the fault is no longer presentEnd of diagnosisFault persists: control unit defectiveReplace the engine management control unit    Op. 1060G80 DS ELECTRIC INJECTION CONTROL UNIT - R R
The engine operates normally at moderate/low speeds but does not achieve its usual performance peaks (in terms of speed and acceleration).
STEPOPERATIONS TO BE CARRIED OUTTEST RESULTS
0PRELIMINARY CHECKSALL OKPROBLEMS ENCOUNTEREDACTION
Check the following, in order:

  • condition of the air intake circuit;
  • that there are no faults in the air filter;
  • the seal of the diesel pipes;
  • the accelerator pedal travel;
  • no obstructions at the catalyzer
Move on to Step 1Air intake circuit faultyRepair the air intake circuit
Air filter blockedReplace the filter element    Op. 1048A14 AIR CLEANER FILTERING ELEMENT - REPLACE.
Leaks from diesel pipesEliminate the leaks
Accelerator pedal does not complete its full travelEliminate the cause of the problem
Catalytic converter obstructedReplace the catalytic converter    Op. 1080B62 CATALYTIC CONVERTER - R + R
1CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Connect the diagnostic equipment to the diagnostic socket.Check:

  • that there are no errors in the control unit;
  • parameter plausibility
Move on to Step 2Error detected in the control unitContinue following the instructions for the diagnostic equipment
Parameters not plausibleContinue following the instructions for the diagnostic equipment
2ROAD TEST USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Carry out a road test keeping the diagnostic equipment connected.
Make sure that the conditions in which the problem occurs are reproduced
Check:

  • that there are no errors in the control unit;
  • parameter plausibility
Move on to Step 3The sudden onset of errors in the control unit is detectedContinue following the instructions for the diagnostic equipment
Parameters off the scaleContinue following the instructions for the diagnostic equipment
No communication with the control unitRestore the connection between the engine management control unit and the diagnostic connector    See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
3CHECK PRESSURE PUMP THIRD PISTON DEACTIVATION DEVICEALL OKPROBLEMS ENCOUNTEREDACTION
Check operation of the third pressure pump piston deactivation device.Move on to Step 4Electrical connections not correctRepair the electrical connections    See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
The device is not working: it remains closed even above 2/3 of the engine full load conditionsReplace the pressure pump    Op. 1060E10 PRESSURE PUMP - R R
4BRAKE PEDAL SWITCH CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the brake pedal switch is working properlyMove on to Step 5Brake pedal does not returnEliminate the cause of the sticking
Switch stuck closedReplace the switch
Wiring short circuitedEliminate the cause of the problem    See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
5TURBOCHARGER CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the operation of the turbocharger as described in Test 1064BA    See Test 1064B CONTROL/SAFETY DEVICESMove on to Step 6Turbocharger faultyReplace the turbocharger
6HIGH PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Connect the diagnostic equipment to the diagnostic socket.Check, as described in Test 1060OD, that the diesel pressure parameter is correct.    See Test 1060O DIESEL FUEL INJECTION SUPPLY TESTSMove on to Step 14Pressure not correctMove on to Step 7
7LOW RETURN PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check, as described in Test 1060OA, that the pressure in the return pipe to the tank is less than 1 bar.     See Test 1060O DIESEL FUEL INJECTION SUPPLY TESTSMove on to Step 8Pressure above the maximum limit: return pipe to the tank obstructedRepair the pipe and replace if necessary
8LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check, as described in Test 1060OB, that the diesel pressure between the filter and the pressure pump is between 2 and 3 bar.     See Test 1060O DIESEL FUEL INJECTION SUPPLY TESTSMove on to Step 14Pressure below the minimum limit or above the maximum limitMove on to Step 9
9LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Constrict the return pipe, downstream of the valve, and carry out Test 1060B again with the pipe constricted checking that the pressure at the filter outlet stays below 2 bar    See Test 1060O DIESEL FUEL INJECTION SUPPLY TESTSMove on to Step 10Pressure rises to 5 bar: low pressure regulator in filter mounting defectiveReplace filter mounting
10LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the difference in pressure upstream and downstream of the filter is less than 1 barMove on to Step 11Difference in pressure more than 1 barReplace the fuel filter cartridge    Op. 1044B20 FUEL FILTER FILTERING ELEMENT - REPLACE
11LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the supply pump pressure is more than 2.2 barMove on to Step 14Pressure below 2 barMove on to Step 12
12LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the pressure difference between the electric pump outlet and the filter inlet is less than 0.3 barMove on to Step 13Difference in pressure more than 0.3 barReplace the pipe
13LOW SUPPLY PRESSURE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check, as described in Test 1040AA, that the pump supply voltage is equal to 12 volt and that the current absorbed is between 2 and 10 Ampere    See Test 1040A FUEL TANK AND COMPONENTSMove on to Step 14Voltage < 12 VCheck electrical wiring    See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
Current > 10 Amps: pump not running smoothlyReplace the fuel pump assembly    Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R
Current < 2 Amps: pump obstructedReplace the fuel pump assembly and clean the fuel tank    Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R
14CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Replace the DRV pressure regulation valve and check that the fault is no longer present    Op. 1060E50 PRESSURE REGULATOR - R REnd of diagnosisFault persistsRenew the valve and move on to Step 15
15CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Replace the pressure pump and check that the fault is no longer present    Op. 1060E10 PRESSURE PUMP - R REnd of diagnosisFault persistsRenew the pump and move on to Step 16
16TIMING CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the valve gear timing is correctMove on to Step 17Valve gear timing not correctRestore the correct valve gear timing    Op. 1032B10 TOOTHED TIMING BELT - R + R FOR TIMING ADJUSTMENT OR REPLACEMENT
17VALVE CLEARANCE CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the tappet clearance is correct    Op. 1036H14 VALVE TAPPETS - CHECK CLEARANCEMove on to Step 18Valve clearance not correctAdjust the tappets    Op. 1036H10 VALVE TAPPETS - CHECK AND ADJUST CLEARANCE
18CYLINDER COMPRESSION CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Carry out the cylinder compression checkMove on to Step 20Cylinder compression insufficientMove on to Step 19
19CHECK ON CAUSE OF INSUFFICIENT COMPRESSIONALL OKPROBLEMS ENCOUNTEREDACTION
R/R head for valve leakage test    Op. 1016C10 SINGLE CYLINDER HEAD, REMOVED - OVERHAULCheck condition of cylinders/piston ringsMove on to Step 20
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