ECD SYSTEM(w/ Glow Plug Controller) Turbocharger Noise

DTC Code DTC Name
Turbocharger Noise

DESCRIPTION

Tip:

Turbocharger noise is classified into 2 types. One is whistling noise, and the other is whining noise. When troubleshooting, the type of noise should be determined first.

Table 1. Description

Noise Type

Noise Description

Main Trouble Area

Whistling noise

The volume and pitch of this noise are proportional to turbocharger speed or engine speed. Therefore, the noise level will become more obvious when engine speed increases.

  • Turbocharger sub-assembly (e.g. shaft imbalance)

  • Gears inside engine

  • Transmission gear

  • Intake air system leakage

  • Intake air system breakage

Whining noise

This noise has a lower pitch than whistling noise. It generally occurs in the engine speed range of 1500 to 2500 rpm, and has a relatively constant pitch, independent of engine speed and vehicle speed.

Turbocharger sub-assembly

Tip:

  • Example: Vibration of turbocharger is transferred to exhaust pipe which causes resonation and noise.

  • Example: Vibration of turbocharger is transferred through exhaust pipe to vehicle body (floor) which then vibrates causing noise.

  1. Faults and Symptoms of Diesel Engine Components

    Table 2. Turbocharger System

    Main fault

    Turbocharger turbine shaft imbalance

    Symptoms

    High-pitched whistling noise

    Tip:

    The pitch and volume change in proportion to the turbocharger speed.
    Table 3. Intake System

    Main fault

    Leakage

    Symptoms

    Leak flow noise
    Table 4. Gear inside Engine

    Symptoms

    Gear noise

    Tip:

    The pitch and volume change in proportion to the engine speed.
    Table 5. Transmission Gear

    Symptoms

    Gear noise

    Tip:

    The pitch and volume change in proportion to the transmission gear speed.

PROCEDURE

  1. CONFIRM CONDITION IN WHICH NOISE OCCURRED

    1. Confirm with the customer the conditions in which the noise occurred.

      Tip:

      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 the noise to be abnormal?

    Result

    Proceed to

    NEXT
    NEXT

  2. CONFIRM NOISE CUSTOMER MENTIONED (PROCEDURE 2)

    1. Check for the noise described by the customer.

      Tip:

      If a noise is heard, make sure that the noise matches the noise described by the customer.

      Result

      Result

      Proceed to

      Obvious abnormal noise matching noise described by customer is confirmed

      A

      Obvious abnormal noise matching noise described by customer is not confirmed

      B
    B

    EXPLAIN TO THE CUSTOMER THAT THE NOISE IS NORMALClick here

    A

  3. CHECK INTAKE SYSTEM

    1. Check for air leakage between the air cleaner and turbocharger sub-assembly, and between the turbocharger sub-assembly and intake manifold.

      Click hereClick here

      Tip:

      • Check for disconnected or improperly connected hoses, and gaps between hoses and parts.

      • Check for foreign matter between the air cleaner and turbocharger sub-assembly.

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTS

    OK

  4. CONFIRM NOISE SOURCE (FROM TURBOCHARGER OR NOT)

    1. Connect the GTS to the DLC3.

    2. Start the engine and warm it up.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VN Turbo Open.

      Powertrain > Engine and ECT > Active Test

      Tester Display

      Activate the VN Turbo Open

    5. Perform the Active Test and rev the engine up several times.

    6. Check whether the noise is reduced or not compared with the noise under the conditions that the Active Test is not performed.

      Result

      Result

      Proceed to

      The noise is reduced (or disappears)

      A

      The noise is the same as in Procedure 2 (The noise does not change)

      B
      Tip:

      • When the variable nozzle of the turbocharger sub-assembly opens fully regardless of the engine condition, the turbocharger sub-assembly speed slows down and the cause of noise can be confirmed that is from the turbocharger sub-assembly or not.

      • If the turbocharger sub-assembly is the cause of the noise, the noise will be reduced when the variable nozzle opens because turbocharger speed does not increase.

    B

    CHECK FOR NOISE FROM SOURCE OTHER THAN TURBOCHARGER (PROCEDURE 7)Click here

    A

  5. CONFIRM NOISE TYPE

    1. Check whether the noise can be heard even when the engine speed is more than 3000 rpm, and whether the noise gradually gets louder as the engine speed increases.

      Tip:

      If so, the noise is likely to be whistling noise. If not, the noise is likely to be whining noise.

      Result

      Result

      Proceed to

      Yes (The noise is likely to be whistling noise)

      A

      No (The noise is likely to be whining noise)

      B
    A

    REPLACE TURBOCHARGER SUB-ASSEMBLY

    Click hereClick here

    B

  6. PERFORM ALIGNMENT OF EXHAUST PIPE AND CONFIRM THE NOISE

    1. Disconnect the exhaust pipe at the ball joint and from each exhaust pipe support, and then realign the exhaust pipe and reconnect it to each exhaust pipe support and at the ball joint.

      Click here

      A358339C01

      *1

      No. 2 Exhaust Manifold

      *2

      Center Exhaust Pipe Assembly

      *3

      Exhaust Pipe Support

      *4

      Front Exhaust Pipe Assembly

      *5

      Tail Exhaust Pipe Assembly

      -

      -
      V100135

      Ball Joint

      -

      -
      Tip:

      Above illustration is an example.

    2. Confirm whether the noise problem is solved or not.

      Tip:

      The alignment of the exhaust pipe affects whining noise.

      Result

      Result

      Proceed to

      The noise problem is solved

      A

      The noise problem remains

      B
    A

    END

    B

    REPLACE TURBOCHARGER SUB-ASSEMBLY

    Click hereClick here

  7. CHECK FOR NOISE FROM SOURCE OTHER THAN TURBOCHARGER (PROCEDURE 7)

    1. Check for the noise source with a sound scope.

      Note:

      When performing this check, make sure that the sound scope, your body, etc., do not get caught on the V-belt.

      Tip:

      • The source of the noise is not the turbocharger sub-assembly, but a part other than the turbocharger sub-assembly (e.g. a part inside the engine, transmission, or vacuum pump).

      • Sometimes gear noise may be mistaken for turbocharger sub-assembly noise. For gear noise, pay attention to the gears inside the engine and transmission gears.

      • Rev the engine up and check if the noise is reduced at the same time the engine speed decreases. If the noise is reduced at the same time the engine speed decreases, it is gear noise. If the noise is reduced a short time after the engine speed decreases, it is turbocharger noise.

      • The following illustration is a reference for checking whether the noise source is from the engine.

      A358490C01

      *1

      Vacuum Pump Assembly

      *2

      Camshaft

      *3

      Supply Pump Assembly

      *4

      Chain Tensioner Slipper

      *5

      Chain Sub-assembly

      *6

      No. 1 Chain Vibration Damper

      *7

      Oil Pump Assembly

      *8

      No. 2 Chain Sub-assembly

      *a

      Gear Location inside Engine

      -

      -
      Tip:

      • Above illustration is an example.

      • Gear noise can be confirmed with a sound scope. Put the sound scope on the cylinder block near the gear, and if the noise heard through the sound scope has the same timing as the noise heard without the sound scope, it is gear noise.

    Result

    Proceed to

    NEXT
    NEXT

  8. REPLACE THE PARTS DETECTED IN PROCEDURE 7

    1. Replace the parts detected in Procedure 7 as the noise source.

    Result

    Proceed to

    NEXT
    NEXT

  9. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Check whether the noise problem has been successfully solved.

    Result

    Proceed to

    NEXT
    NEXT

    END

  10. EXPLAIN TO THE CUSTOMER THAT THE NOISE IS NORMAL

    1. Explain to the customer that the noise the customer mentioned is not abnormal.

      Tip:

      To help the customer understand, performing a test drive another car with the customer may be helpful.

    Result

    Proceed to

    NEXT
    NEXT

    END