DESCRIPTION
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.
Noise Type | Noise Description | Main Trouble Area |
---|---|---|
Whistling noise | The volume and pitch of this noise is proportional to turbocharger speed or engine speed. Therefore, the noise level will become more obvious when engine speed increases. |
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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:
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Main fault | Turbocharger turbine shaft imbalance |
Symptoms |
High-pitched whistling noise
Tip:
The pitch and volume change proportionally to the turbocharger speed. |
Main fault | Leakage |
Data List | Leak flow noise |
Faults and Symptoms of Diesel Engine Components
Symptoms |
Gear noise
Tip:
The pitch and volume change proportionally to the engine speed. |
Symptoms |
Gear noise
Tip:
The pitch and volume change proportionally to the transaxle gear speed. |
PROCEDURE
CONFIRM CONDITION IN WHICH NOISE OCCURRED
Confirm with the customer the condition when noise occurred.
To clearly understand the conditions in which the noise occurred, the items in the table below are useful.
Item | Note |
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Engine speed | Engine speed range |
Vehicle speed | Vehicle speed range |
Transaxle gear | Which gear? |
Accelerator pedal position | During acceleration or deceleration? |
Temperature |
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Road conditions |
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Noise level |
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Other symptoms |
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Noise recognition | What made the customer determine the noise to be abnormal? |
Result | ||
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NEXT |
CONFIRM NOISE CUSTOMER MENTIONED (PROCEDURE 2)
Check for the noise described by the customer.
If a noise is heard, make sure that the noise matches the noise described by the customer.
Result | ||||||
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B | Нажмите здесь |
A |
CHECK INTAKE SYSTEM
Check for air leakage between the air cleaner case sub-assembly and turbocharger sub-assembly, and between the turbocharger sub-assembly and intake manifold.
Check for disconnected or improperly connected hoses, and gaps between hoses and parts.
Check for foreign matter between the air cleaner case sub-assembly and turbocharger sub-assembly.
Result | |||
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NG |
REPAIR OR REPLACE MALFUNCTIONING PARTS |
OK |
CONFIRM NOISE SOURCE (FORM TURBOCHARGER SUB-ASSEMBLY OR NOT)
Connect the GTS to the DLC3.
Start the engine and warm it up.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VN Turbo Open.
Powertrain > Engine and ECT > Active TestTester Display |
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Activate the VN Turbo Open |
Perform the Active Test under the conditions* from the time the noise occurred described by the customer and compare the noise to the noise heard when not performing the Active Test and check if the noise is reduced.
*: Some examples of conditions are idling, racing the engine and driving at full throttle.
Result | ||||||
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By performing Activate the VN Turbo Open Active Test, the variable nozzle of the turbocharger sub-assembly becomes fully open regardless of the engine condition, and the turbocharger speed does not increase.
If the turbocharger sub-assembly is the cause of the noise, the noise will be reduced when Activate the VN Turbo Open Active Test is performed because turbocharger speed does not increase.
B | Нажмите здесь |
A |
CONFIRM THE NOISE TYPE
Check whether the noise can be heard even when the engine speed is higher than 3000 rpm, and whether the noise gradually gets louder as the engine speed increases.
If so, the noise is likely to be whistling noise. If not, the noise is likely to be whining noise.
Result | ||||||
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A |
REPLACE TURBOCHARGER SUB-ASSEMBLY Click hereНажмите здесь |
B |
PERFORM ALIGNMENT OF EXHAUST PIPE AND CONFIRM THE NOISE
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 hereНажмите здесь
*A | for Hatchback | - | - |
*1 | Gasket (Ball Joint) | *2 | Compression Spring |
*3 | Exhaust Pipe Support | *4 | Air Fuel Ratio Sensor |
*5 | Front Exhaust Pipe Assembly | *6 | Tail Exhaust Pipe Assembly |
N*m (kgf*cm, ft.*lbf): Specified torque | ● | Non-reusable part |
*A | for Wagon | - | - |
*1 | Gasket (Ball Joint) | *2 | Compression Spring |
*3 | Exhaust Pipe Support | *4 | Air Fuel Ratio Sensor |
*5 | Front Exhaust Pipe Assembly | *6 | Tail Exhaust Pipe Assembly |
N*m (kgf*cm, ft.*lbf): Specified torque | ● | Non-reusable part |
Confirm whether the noise problem is solved or not.
The alignment of the exhaust pipe affects whining noise.
Result | ||||||
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A |
END |
B |
REPLACE TURBOCHARGER SUB-ASSEMBLY Click hereНажмите здесь |
CHECK FOR NOISE FROM SOURCE OTHER THAN TURBOCHARGER (PROCEDURE 7)
Check for the noise source.
ОСТОРОЖНО
When performing this check, make sure that the sound scope, your body, etc., do not get caught on the V-belt.
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, transaxle, or vacuum pump).
Sometimes gear noise may be mistaken for turbocharger noise.
For gear noise, pay attention to the gear inside the engine and transaxle gear.
Rev the engine up and check if the noise reduces at the same time the engine speed decreases. If the noise reduces at the same time the engine speed decreases, it is gear noise. If the noise reduces a short time after the engine speed decreases, it is turbocharger noise.
Result | ||
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NEXT |
REPLACE THE PARTS DETECTED IN PROCEDURE 7
Replace the parts detected in procedure 7 as the noise source.
Result | ||
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NEXT |
CONFIRM WHETHER THE NOISE PROBLEM HAS BEEN SUCCESSFULLY SOLVED
Check whether the noise problem has been successfully solved.
Result | ||
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NEXT |
END |
EXPLAIN TO THE CUSTOMER THAT THE NOISE IS NORMAL
Explain to the customer that the noise the customer mentioned is not abnormal.
To help the customer understand, performing a test drive in another car with the customer may be helpful.
Result | ||
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NEXT |
END |