SFI SYSTEM(w/ Canister Pump Module) Turbocharger Noise

DESCRIPTION

Tech Tips

Turbocharger noise is classified into two types. These are whistling sound and chattering sound. During troubleshooting, first determine the type of noise.

Type of Abnormal Noise Outline of Abnormal Noise Major Trouble Area
Whistling sound (airflow sound) The whistling sound volume and pitch are proportional to the turbocharger or engine speed. The abnormal noise level becomes clear when the engine speed is increased.

  • Turbocharger (example: unstable shaft)

  • Transmission gears

  • Leak in intake system

  • Damaged intake system
Chattering sound (metallic sound) The chattering sound pitch is lower than the whistling sound pitch. Has a comparatively constant pitch that is independent of the engine speed and vehicle speed.

Turbocharger

Tech Tips


  • The turbocharger vibrations are transmitted to the exhaust pipe, causing noise and resonance.

  • The turbocharger vibrations are transmitted through the exhaust pipe to the chassis (floor), causing noise and resonance in the chassis.
B006FZEC01
*1 Disc Spring *2 Bush
*3 Waste Gate Valve Rod *4 E-Ring

  1. Faults and Symptoms of Engine Components

    Turbocharger system
    Main fault

    • Unstable turbocharger turbine shaft (interference, seizing, poor balance, etc.)

    • Poor installation or defective operation of the waste gate valve.

    • Poor installation or defective operation of the air by-pass valve assembly.
    Symptom

    • High-pitched whistling sound

      Tech Tips

      The volume and pitch are proportional to the turbocharger speed.

    • Metallic sound due to looseness
    Intake system
    Main fault Leak
    Symptom Abnormal noise during intake leak
    Transmission gears
    Symptom

    Gear noise

    Tech Tips

    The volume and pitch are proportional to the transmission gear speed.

PROCEDURE


  1. CONFIRM CONDITION IN WHICH NOISE OCCURRED


    1. Confirm with the customer the condition when noise occurred.

      Tech Tips

      To clearly understand the conditions in which the noise occurred, the items in the table below are useful.

      Item Note
      Engine speed Engine speed range
      Vehicle speed Vehicle speed range
      Transmission gear Which gear?
      Accelerator pedal position During acceleration or deceleration?
      Temperature

      • Ambient temperature

      • Engine temperature (cold, warmed up, etc.)
      Road conditions

      • City or highway driving

      • Uphill or downhill
      Noise level

      • Did the noise occur suddenly, or build gradually?

      • Has the noise gradually been getting louder?
      Other symptoms

      • Lack of power

      • High fuel consumption, etc.
      Noise recognition What made the customer determine that the sound was a malfunction?
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Check the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC is not output A
      DTCs are output B

      Tech Tips


      • Check whether a DTC is stored related to the boost pressure sensor or atmospheric pressure sensor (in ECU).

      • If a DTC is stored related to the boost pressure sensor or atmospheric pressure sensor (in ECU), defective actuator control related to the turbocharger may be the cause of the turbocharger noise.


    B

    GO TO DTC CHART Click here

    A

  3. PERFORM SIMULATION TEST


    1. Check whether the noise described by the customer occurs.

      Tech Tips

      If an abnormal noise is heard, check whether it matches the noise described by the customer.

    2. If an abnormal noise is confirmed, determine which system emits it.

      Result
      Result Proceed to
      Noise occurs (ticking or rattling (metallic sound) during idling) A
      Noise occurs (squealing (metallic sound) when driving) B
      Noise occurs (hissing (airflow sound) when driving) C
      Noise occurs (whistling or foghorn-like (airflow sound) during acceleration or deceleration) D
      The noise described by the customer could not be confirmed. E

      Tech Tips

      Perform "Inspection After Repair" after replacing the turbocharger sub-assembly.

      Click here


    A

    REPLACE TURBOCHARGER SUB-ASSEMBLY REPLACE TURBOCHARGER SUB-ASSEMBLY Click here If there is a change in abnormal noise when the waste gate valve rod is pushed down, the noise may be a metallic sound from increased rattle due to wear. When the waste gate valve rod is pressed down and a change in the abnormal noise occurs, there is a possibility of metallic sounds being caused by wear due to looseness spreading in the waste gate valve actuator assembly, waste gate valve rod, waste gate valve connections and waste gate valve rod disc spring wear. When the waste gate valve rod is pressed down and there is no change in noise, there is a possibility of metallic sounds being caused by wear due to looseness spreading in the waste gate valve disc spring wear. Rattling sounds from the waste gate valve actuator assembly is due to the play in the internal gears and is not a malfunction.

    C

    CHECK TURBOCHARGER SUB-ASSEMBLY Click here

    D

    CHECK TURBINE SHAFT Click here

    E

    EXPLAIN TO CUSTOMER THAT SOUND IS NORMAL Click here

    B

  4. CHECK TURBINE SHAFT


    1. Check that the turbine shaft rotates smoothly, without catching.

      Click here

    2. Check for loose turbine mounting nuts and for axial play in the turbine shaft.

      Click here

      Tech Tips

      If the turbine shaft catches or if there no play or excessive play, it could indicate poor sliding due to seal damage due to seizing or a deposit build-up.

      Standard value
      0.10 mm (0.00394 in.) or less
      Result
      Result Proceed to
      No turbine shaft malfunction A
      Turbine shaft malfunction B

      Tech Tips

      Perform "Inspection After Repair" after replacing the turbocharger sub-assembly.

      Click here


    B

    REPLACE TURBOCHARGER SUB-ASSEMBLY Click here

    A

  5. CHECK COMPRESSOR IMPELLER


    1. Check for damage to the compressor impeller.

    2. Check for interference between the compressor impeller and the compressor housing.

      Result
      Result Proceed to
      No damage or interference A
      Damage or interference exists B

      Tech Tips

      Perform "Inspection After Repair" after replacing the turbocharger sub-assembly.

      Click here


    B

    REPLACE TURBOCHARGER SUB-ASSEMBLY Click here

    A

  6. REPLACE TURBOCHARGER SUB-ASSEMBLY


    1. Replace the turbocharger sub-assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. PERFORM SIMULATION TEST


    1. Check that the abnormal noise has disappeared.

      Result
      Proceed to
      NEXT

    NEXT

    END

  8. CHECK TURBOCHARGER SUB-ASSEMBLY


    1. Check that no soot or oil adheres to the turbocharger sub-assembly connectors.

      B006AW0N01

      Tech Tips

      If adhering soot or an oil leak exists, air leaking at that position may be the cause of the abnormal noise.

      Result
      Result Proceed to
      No adhering soot or an oil A
      Soot adhering around the turbine housing, flange, or V band (A in the illustration) B
      Oil leak from the contact surface between the compressor housing and the seal plate or between the seal plate and the bearing housing (B in the illustration)
      Oil adhering to the compressor flange (C in the illustration) C

      Tech Tips

      Perform "Inspection After Repair" after replacing the turbocharger sub-assembly.

      Click here


    B

    REPLACE TURBOCHARGER SUB-ASSEMBLY Click here

    C

    REPAIR OR REPLACE DEFECTIVE PARTS (PARTS LEAKING OIL) Click here

    A

  9. REPLACE TURBOCHARGER SUB-ASSEMBLY


    1. Replace the turbocharger sub-assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  10. PERFORM SIMULATION TEST


    1. Check that the abnormal noise has disappeared.

      Result
      Proceed to
      NEXT

    NEXT

    END

  11. REPAIR OR REPLACE DEFECTIVE PARTS (PARTS LEAKING OIL)


    1. Repair or replace the parts that are leaking oil.

      Tech Tips


      • If oil leaks from the contact surface between the compressor inlet elbow and the compressor housing, the installation may be incorrect due to loose nuts or a defective gasket. Check the installation or replace the gasket.

      • If oil leaks from the contact surface between the compressor outlet elbow and the compressor housing, the installation may be incorrect due to loose nuts or a defective gasket. Check the installation or replace the gasket.

      Result
      Result
      NEXT

    NEXT

    END

  12. CHECK TURBINE SHAFT


    1. Check that the turbine shaft rotates smoothly, without catching.

      Click here

      Click here

    2. Check for loose turbine mounting nuts and for axial play in the turbine shaft.

      Click here

      Tech Tips

      If the turbine shaft catches or if there no play or excessive play, it could indicate poor sliding due to seal damage due to seizing or a deposit build-up.

      Standard value
      0.10 mm (0.00394 in.) or less
      Result
      Result Proceed to
      No turbine shaft malfunction A
      Turbine shaft malfunction B

      Tech Tips

      Perform "Inspection After Repair" after replacing the turbocharger sub-assembly.

      Click here


    B

    REPLACE TURBOCHARGER SUB-ASSEMBLY Click here

    A

  13. CHECK COMPRESSOR IMPELLER


    1. Check for damage to the compressor impeller.

    2. Check for interference between the compressor impeller and the compressor housing.

      Tech Tips

      If the previous checks find no malfunction, replace the compressor with bearing housing sub-assembly and determine if the noise improved.

      Result
      Result Proceed to
      No damage or interference A
      Damage or interference exists B

      Tech Tips

      Perform "Inspection After Repair" after replacing the turbocharger sub-assembly.

      Click here


    B

    REPLACE TURBOCHARGER SUB-ASSEMBLY Click here

    A

  14. REPLACE TURBOCHARGER SUB-ASSEMBLY


    1. Replace the turbocharger sub-assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  15. PERFORM SIMULATION TEST


    1. Check that the abnormal noise has disappeared.

      Result
      Result Proceed to
      Abnormal noise has disappeared A
      Noise occurs (whistling sound) B

    A

    END

    B

  16. CHECK GEAR NOISE


    1. Check if gear noise is the source of the abnormal noise (not noise from the turbocharger).

      Result
      Proceed to
      NEXT

    NEXT

    ELIMINATE THE CAUSE OF THE NOISE

  17. EXPLAIN TO CUSTOMER THAT SOUND IS NORMAL


    1. Explain to the customer that the sound described by the customer is not a malfunction.

      Tech Tips

      To convince the customer, it is helpful to drive the customer in a different vehicle.

      Result
      Proceed to
      NEXT

    NEXT

    END