Turbocharger Noise [11/2021 - ]: Procedure

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

   HINT: 

   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

Result: 

NEXT 

See step  2

1. Check the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   DTCs are output	B

   HINT: 

   • Check whether DTCs related to the boost pressure sensor or atmospheric pressure sensor are output.
   • If a DTC related to the boost pressure sensor or atmospheric pressure sensor is output, defective actuator control related to the turbocharger may be the cause of the noise.

Result: 

B 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2021 - 03/2023]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [03/2023 - 03/2024]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [03/2024 - ] 

Result: 

A 

See step  3

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

   HINT: 

   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)	D
   Noise occurs (whistling (airflow sound) during deceleration)	E
   The noise described by the customer could not be confirmed	F

Result: 

B 

See step  6

Result: 

C 

See step  10

Result: 

D 

See step  16

Result: 

E 

See step  18

Result: 

F 

See step  19

Result: 

A 

See step  4

1. Check the installation condition of the E-ring on the link connection of the waste gate valve actuator and waste gate valve.
2. When the actuator rod of the waste gate valve actuator is pushed down, check whether there is a change in the abnormal noise.

   HINT: 

   If there is a change in abnormal noise when the actuator rod is pushed down, the noise may be a metallic sound from increased rattle due to wear.

   Result

   Result	Proceed to
   There is no change in the abnormal noise when the actuator rod is pushed down.	A
   There is a change in the abnormal noise when the actuator rod is pushed down.	B

Result: 

B 

REPLACE TURBOCHARGER SUB-ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

A 

See step  5

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

Result: 

A 

END (CAUSE CHECK EXCEPT THE TURBO CHARGER) 

Result: 

B 

REPLACE TURBOCHARGER SUB-ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

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

   Refer to ON-VEHICLE INSPECTION [11/2021 - ]

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

   Refer to INSPECTION [11/2021 - ]

   HINT: 

   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

Result: 

B 

REPLACE TURBOCHARGER SUB-ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

A 

See step  7

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

Result: 

B 

REPLACE TURBOCHARGER SUB-ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

A 

See step  8

1. Replace the compressor housing with bearing sub-assembly.

   Refer to REMOVAL [11/2021 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  9

1. Check that the abnormal noise has disappeared.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

END 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT: 

   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)	C
   Oil adhering to the compressor flange (C in the illustration)	D

Result: 

B 

See step  13

Result: 

C 

REPLACE TURBOCHARGER SUB-ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

D 

REPLACE GASKET 

Result: 

A 

See step  11

1. Replace the turbocharger sub-assembly.

   Refer to REMOVAL [11/2021 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  12

1. Check that the abnormal noise has disappeared.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

END 

1. Check for deformation or cracks in the mounting surfaces on the converter with catalyst assembly and the turbine housing with valve sub-assembly.

   HINT: 

   Deformation or cracks on a mounting surface may allow exhaust gas to leak from the damaged position.

   Standard

   No deformation or cracks on a mounting surface

   Result

   Result	Proceed to
   No problem with the mounting surface	A
   Deformation or cracks on the converter with catalyst assembly mounting surface	B
   Deformation or cracks on the turbine housing with valve sub-assembly mounting surface	C

Result: 

B 

REPLACE CONVERTER WITH CATALYST ASSEMBLY. Refer to  REMOVAL [11/2021 - 03/2024]  , or refer to  REMOVAL [03/2024 - ] 

Result: 

C 

REPLACE TURBOCHARGER SUB-ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

A 

See step  14

1. Replace the exhaust pipe clamp and the gasket.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  15

1. Check that the abnormal noise has disappeared.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

END 

1. Replace the compressor housing with bearing sub-assembly.

   Refer to REMOVAL [11/2021 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  17

1. Check that the abnormal noise has disappeared.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

END 

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

ELIMINATE THE CAUSE OF THE NOISE 

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

   HINT: 

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

END