СИСТЕМА ECD Engine Knocking or Rattling

DESCRIPTION

Malfunction Condition Main Trouble Area Related Trouble Area

  • Knocking and abnormal sound due to extremely rich combustion

  • Abnormal sound due to friction between parts

  • (a) Injector assembly malfunctions


    • Injector sliding malfunction

    • Injector stuck closed

    • Injector stuck open

    • Deposits in injector


    • Injector circuit malfunction


  • (b) Abnormal common rail pressure


    • Suction control valve (fuel supply pump assembly)

    • Fuel pulsation sound

    • Air in fuel


  • (c) Friction between parts


  • (d) Compression pressure

  • Injector compensation codes

  • Fuel leakage

  • Intake air system leakage

  • Intake air system blockage

  • EGR system

  • Throttle valve system

  • Fuel pressure sensor (common rail assembly)

  • Manifold absolute pressure sensor

  • Atmospheric pressure sensor (built into ECM)

  • Vehicle modifications

  • Low quality fuel

  • Lack of fuel

  • ECM

Tech Tips


  • Specified values in the following troubleshooting flowchart are for reference only. Variations in the Data List values may occur depending on the measuring conditions or the vehicle's age. Do not judge the vehicle to be normal even when the Data List values indicate a standard level. There are possibly some concealed factors of the malfunction.

  • Check that the vehicle has not been modified in any way prior to the vehicle inspection.

INSPECTION PROCEDURE

Tech Tips


  • This troubleshooting procedure checks for knocking and rattling.

  • Knocking is most likely to occur while the engine is idling.

Note


  • After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

  • After replacing the fuel supply pump, the ECM needs initialization Click here.

  • After replacing an injector assembly, the ECM needs registration Click here.

PROCEDURE


  1. CHECK SOUND AREA


    1. Find the source of the abnormal sound using a mechanic's stethoscope.

      Result
      Result Proceed to
      Combustion noise from engine A
      Noise from specific part B

    B

    REPAIR OR REPLACE MALFUNCTIONING PARTS

    A

  2. READ OUTPUT DTCS (RELATING TO ENGINE)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    4. Read DTCs.

      Result
      Result Proceed to
      No output A
      Engine related DTCs B

    B

    GO TO DTC CHART Click here

    A

  3. CHECK INJECTOR COMPENSATION CODE

    Note

    Injector compensation codes are unique, 30-digit, alphanumeric values printed on the head portion of each injector assembly. If an incorrect injector compensation code is input into the ECM, the engine may rattle or engine idling may become rough. In addition, engine failure may occur and the life of the engine may be shortened.


    1. Check the injector compensation code Click here.

      OK
      Compensation codes of the installed injector assemblies are the same as the compensation codes registered in the ECM.

    NG

    PERFORM ECM INITIALIZATION AND REGISTER INJECTOR COMPENSATION CODE Click here

    OK

  4. TAKE SNAPSHOT DURING IDLING AND 4000 RPM (AFTER ENGINE WARMED UP)


    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List.

    4. Take a snapshot of the following Data List items.

      Tech Tips


      • A snapshot can be used to compare vehicle data from the time of the malfunction to normal data and is very useful for troubleshooting. The data in the list below is that of a normal vehicle, but as the data varies between individual vehicles, this data should only be used for reference.

      • Check the Data List at idling and at 4000 rpm with no load after the engine is warmed up.


    NEXT

  5. CHECK SNAPSHOT (INJECTION FEEDBACK VAL #1 TO #4 AND INJECTION VOLUME)


    1. Check Injection Feedback Val #1 to #4 and Injection Volume in the snapshot taken when the engine was idling and at 4000 rpm with no load.

      Result
      Result Proceed to

      Injection Feedback Val for at least one cylinder is more than +3 mm3/st

      		 A

      Injection Volume is 8 mm3/st or less at 4000 rpm

      		 B
      Except above C

    A

    CHECK CYLINDER COMPRESSION PRESSURE Click here

    B

    REPLACE INJECTOR ASSEMBLIES OF ALL CYLINDERS Click here

    C

  6. CHECK SNAPSHOT (COMMON RAIL PRESSURE AND TARGET COMMON RAIL PRESSURE)


    1. Check Common Rail Pressure and Target Common Rail Pressure in the snapshot taken when the engine was warmed up and idling.

      OK
      Common Rail Pressure is within +/-5000 kPa of Target Common Rail Pressure.

    NG

    REPLACE SUCTION CONTROL VALVE Click here

    OK

  7. CHECK THE TEMPERATURE WHEN KNOCKING OCCURS


    1. Check the temperature when knocking trouble occurs.

      Result
      Result Proceed to
      Knocking occurs only in cold engine A
      Knocking occurs both in cold and warmed up engine B

    B

    READ VALUE USING GTS (MAP AND ATMOSPHERE PRESSURE) Click here

    A

  8. INSPECT GLOW PLUG (RESISTANCE)


    1. Inspect the glow plug Click here.


    NG

    REPLACE GLOW PLUG Click here

    OK

  9. TAKE SNAPSHOT DURING IDLING (WHEN ENGINE COLD)


    1. Make sure that the engine is cold so that the snapshot can be taken under the correct conditions.

    2. Connect the GTS to the DLC3.

    3. Start the engine and turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Diesel Knocking.

    5. Take a snapshot of the following Data List items.

      Tech Tips

      A snapshot can be used to compare vehicle data from the time of the malfunction to normal data and is very useful for troubleshooting. The data in the list below is that of a normal vehicle, but as the data varies between individual vehicles, this data should only be used for reference.


    NEXT

  10. CHECK SNAPSHOT (INJECTION FEEDBACK VAL #1 TO #4)


    1. Check Injection Feedback Val #1 to #4 in the snapshot taken when the engine was idling.

      Result
      Result Proceed to

      Injection Feedback Val for at least one cylinder is more than +3 mm3/st

      		 A
      Except above B

    A

    REPLACE INJECTOR ASSEMBLY OF MALFUNCTIONING CYLINDER Click here

    B

    READ VALUE USING GTS (MAP AND ATMOSPHERE PRESSURE) Click here

  11. REPLACE INJECTOR ASSEMBLIES OF ALL CYLINDERS


    1. Replace the injector assemblies Click here.

      Note


      • When replacing the injector assembly for a cylinder, always be sure to use a new injection pipe.

      • Follow the procedure in the repair manual and temporarily install the injection pipes and nozzle leakage pipe, and then correctly position the injector assemblies. After that, tighten parts according to the torque specifications.

      • If the installation procedure is not performed correctly, injector assemblies may become out of position, which may cause the injector assemblies to deteriorate, resulting in malfunctions.

      • If an injector assembly deteriorates and malfunctions, other problems such as knocking, rough idle, etc. may occur.

      • If an injector assembly becomes out of position, it is possible that the seal between the injector assembly and injection pipe may become incomplete, resulting in a fuel leak.


    NEXT

    CLEAN OR REPLACE FUEL FILTER Click here

  12. CHECK CYLINDER COMPRESSION PRESSURE


    1. Check the cylinder compression pressure Click here.

      Tech Tips

      When compression is low, there may be cracks in the piston or the injector may be installed improperly.


    NG

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

    OK

  13. REPLACE INJECTOR ASSEMBLY OF MALFUNCTIONING CYLINDER


    1. Replace the injector assembly of the malfunctioning cylinder Click here.

      Note


      • When replacing the injector assembly for a cylinder, always be sure to use a new injection pipe.

      • Follow the procedure in the repair manual and temporarily install the injection pipes and nozzle leakage pipe, and then correctly position the injector assemblies. After that, tighten parts according to the torque specifications.

      • If the installation procedure is not performed correctly, injector assemblies may become out of position, which may cause the injector assemblies to deteriorate, resulting in malfunctions.

      • If an injector assembly deteriorates and malfunctions, other problems such as knocking, rough idle, etc. may occur.

      • If an injector assembly becomes out of position, it is possible that the seal between the injector assembly and injection pipe may become incomplete, resulting in a fuel leak.


    NEXT

  14. CLEAN OR REPLACE FUEL FILTER


    1. Clean the interior of the fuel filter case.

    2. If the fuel filter is obviously dirty or clogged, replace the fuel filter.


    NEXT

  15. BLEED AIR FROM FUEL SYSTEM


    1. Bleed the air from the fuel system Click here.


    NEXT

  16. PERFORM ECM INITIALIZATION AND REGISTER INJECTOR COMPENSATION CODE


    1. Perform the ECM initialization.


      1. Connect terminals 13 (TC) and 4 (CG) of the DLC3.

        A003DF8E90

      2. Turn the ignition switch to ON for 50 minutes or more.

        Note


        • Perform ECM initialization only when the injectors for all the cylinders have been replaced.

        • It is necessary to wait for 50 minutes or more. Otherwise, ECM initialization is not completed.

      3. Turn the ignition switch off.

      4. Disconnect terminals 13 (TC) and 4 (CG).

    2. Register the injector compensation codes Click here.


    NEXT

  17. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Check whether the knocking has been successfully repaired.


    NEXT

    END

  18. REPLACE SUCTION CONTROL VALVE


    1. Replace the suction control valve Click here.

      Tech Tips

      If the common rail pressure becomes too high when transitioning due to problems with SCV operation, knocking noise worsens.


    NEXT

  19. BLEED AIR FROM FUEL SYSTEM


    1. Bleed the air from the fuel system Click here.


    NEXT

  20. PERFORM FUEL SUPPLY PUMP INITIALIZATION


    1. Perform fuel supply pump initialization Click here.


    NEXT

  21. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Check whether the knocking has been successfully repaired by starting the engine.


    NEXT

    END

  22. READ VALUE USING GTS (MAP AND ATMOSPHERE PRESSURE)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / MAP and Atmosphere Pressure.

    4. Compare MAP to Atmosphere Pressure when the ignition switch is ON (do not start the engine).

      Standard
      Difference between MAP and Atmosphere Pressure is less than 8 kPa.

      Tech Tips


      • If MAP and Atmosphere Pressure have the same value, both are normal. If there is a difference of 8 kPa or more, compare the values to the atmospheric pressure for that day. The sensor whose deviation is the greatest is malfunctioning.

      • Standard atmospheric pressure is 101 kPa. For every 100 m increase in elevation, pressure drops by 1 kPa. This varies by weather.

      Result
      Result Proceed to
      MAP and Atmosphere Pressure have same value A
      MAP is different from actual atmospheric pressure B
      Atmosphere Pressure is different from actual atmospheric pressure C

    B

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

    C

    REPLACE ECM Click here

    A

  23. BASIC INSPECTION


    1. Check the fuel quality.

    2. Check the fuel for air.

    3. Check the fuel system for blockages.

    4. Check the air filter.

    5. Check the engine oil.

    6. Check the engine coolant.

    7. Check the engine idling speed and maximum engine speed.

    8. Check the vacuum pump.


    NEXT

    END