Lack of Power (Turbocharger System) [09/2022 - ]: Procedure

1. Check for oil leaks and large carbon deposits around the connecting surfaces of the turbocharger sub-assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT: 

   If oil leaks or a large amount of carbon deposits exist, air leaks from the respective sealing surfaces may be causing the lack of boost pressure.

   Result

   Result	Proceed to
   An oil leak or large amount of carbon deposits does not exist.	A
   A large amount of carbon deposits exist around the turbine housing, flange or gaskets in any of the areas (A) shown in the illustration.	B
   A large amount of carbon deposits exist around the waste gate valve link.	C
   Oil is leaking from V-clamp in the area (B) shown in the illustration.	D
   Oil is leaking from the compressor housing in any of the areas (C) shown in the illustration.	E

Result: 

B 

See step  6

Result: 

C 

See step  9

Result: 

D 

REPLACE TURBOCHARGER SUB-ASSEMBLY 

Refer to REMOVAL [09/2022 - ]

Result: 

E 

CHECK AND REPAIR AIR TUBE OR HOSE CLAMP 

Result: 

A 

See step  2

1. Check that the turbine shaft rotates smoothly, without catching.
2. Check for loose turbine mounting nuts and for axial play in the turbine shaft.

   Refer to INSPECTION [09/2022 - ]

   HINT: 

   If the turbine shaft catches or there is no play, seal failure due to seizure or improper operation due to accumulation of deposits is suspected.

   Result

   Result	Proceed to
   No turbine shaft malfunction	A
   Turbine shaft malfunction	B

Result: 

B 

REPLACE TURBOCHARGER SUB-ASSEMBLY (TURBINE SHAFT MALFUNCTION) 

Refer to REMOVAL [09/2022 - ]

Result: 

A 

See step  3

1. Use a vacuum pump to apply -35 +/-4.0 kPa (-263 +/-35 mmHg) negative pressure to the diaphragm chamber and check that the waste gate valve seats.
   NOTE:

   Do not apply a negative pressure of -65 kPa (-488 mmHg) or more to the waste gate valve actuator with bracket assembly, as doing so may damage the diaphragm.

   Standard

   Waste gate valve seats without a gap

   Result

   Result	Proceed to
   Seats at less than -35 kPa (-263 mmHg) negative pressure	A
   Seats at -35 kPa (-263 mmHg) or greater negative pressure	B
   Waste gate valve does not move	C

Result: 

B 

REPLACE TURBOCHARGER SUB-ASSEMBLY (WASTE GATE VALVE ACTUATOR MALFUNCTION) 

Refer to REMOVAL [09/2022 - ]

Result: 

C 

REPLACE TURBOCHARGER SUB-ASSEMBLY (WASTE GATE VALVE MALFUNCTION) 

Refer to REMOVAL [09/2022 - ]

Result: 

A 

See step  4

1. Check for play in the waste gate valve and waste gate valve link.

   Standard

   Play exists

   HINT: 

   Some play is required as the waste gate valve link slides. If no play exists, the valve is determined to be stuck.

2. Close the waste gate valve and using a feeler gauge, measure the clearance between the waste gate valve and the contact surface of the valve port of the turbine with valve housing sub-assembly waste gate.

   Standard

   0.15 mm (0.0059 in.) or less

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE TURBOCHARGER SUB-ASSEMBLY (WASTE GATE VALVE MALFUNCTION) 

Refer to REMOVAL [09/2022 - ]

Result: 

OK 

See step  5

1. Inspect the air by-pass valve assembly.

   Refer to INSPECTION [09/2022 - ]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

Refer to PROBLEM SYMPTOMS TABLE [09/2022 - 09/2024] , or refer to PROBLEM SYMPTOMS TABLE [09/2024 - ]

Result: 

NG 

REPLACE TURBOCHARGER SUB-ASSEMBLY (AIR BY-PASS VALVE ASSEMBLY MALFUNCTION) 

Refer to REMOVAL [09/2022 - ]

1. Check for deformation or cracks in the mounting surfaces on the cylinder head sub-assy and the turbocharger 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 cylinder head sub-assy mounting surface	B
   Deformation or cracks on the turbocharger sub-assembly mounting surface	C

Result: 

B 

REPLACE CYLINDER HEAD SUB-ASSEMBLY 

Refer to DISASSEMBLY [09/2022 - ]

Result: 

C 

REPLACE TURBOCHARGER SUB-ASSEMBLY 

Refer to REMOVAL [09/2022 - ]

Result: 

A 

See step  7

1. Replace the gasket between the cylinder head sub-assy and turbocharger sub-assembly.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  8

1. Check that the abnormal state has disappeared.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

END 

1. Check that the bushing of the turbine housing waste gate valve link is free of cracks.
2. Close the waste gate valve and using a feeler gauge, measure the clearance between the waste gate valve and the contact surface of the valve port of the turbine with valve housing sub-assembly waste gate.

   Standard

   No cracks and play does not exceed 0.15 mm (0.0059 in.)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

Refer to PROBLEM SYMPTOMS TABLE [09/2022 - 09/2024] , or refer to PROBLEM SYMPTOMS TABLE [09/2024 - ]

Result: 

NG 

REPLACE TURBOCHARGER SUB-ASSEMBLY (TURBINE HOUSING MALFUNCTION) 

Refer to REMOVAL [09/2022 - ]