T-SB-0047-23

T-SB-0047-23
July 25, 2023
Creak or Click Type Noise From Rear Over Bumps or
When Braking
Service
Category
Suspension
Section
Rear Suspension
Market USA
Applicability
YEAR(S)
MODEL(S)
2021 - 2023
Mirai
ADDITIONAL INFORMATION
Introduction
Some 2021 – 2023 model Mirai vehicles may exhibit a creaking or clicking type noise from the
rear suspension member. This condition may occur when braking or when driving over speed
bumps and uneven surfaces. Follow the Repair Procedure in this bulletin to address this condition.
Production Change Information
This bulletin applies to vehicles produced BEFORE the Production Change Effective VIN
shown below.
MODEL
PLANT
DRIVETRAIN
PRODUCTION CHANGE EFFECTIVE VIN
Mirai
Motomachi
2WD
JTDAAAAA#PA009091
© 2023 Toyota Motor Sales, USA
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Creak or Click Type Noise From Rear Over Bumps or When Braking
Warranty Information
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
SU2301
R & R Rear Suspension Member Upper
and Lower Stoppers
1.5
52274-#####*
52278-#####*
91
99
*Warranty claim MUST be submitted with the correct 10-digit OFP. Choose the correct OFP for the vehicle being
repaired by searching for the parts in the Electronic Parts Catalog using the VIN filter.
APPLICABLE WARRANTY
 This repair is covered under the Toyota Basic Warranty. This warranty is in effect for 36 months
or 36,000 miles, whichever occurs first, from the vehicle’s in-service date.
 Warranty application is limited to occurrence of the specified condition described in
this bulletin.
Parts Information
PART NUMBER
PART NAME
QTY
52278-62010
Stopper, Rear Suspension Member, Rear Lower
2
52274-50020
52274-62030
Stopper, Rear Suspension Member, Lower
2
52274-62010
52274-62040
Stopper, Rear Suspension Member, Lower
2
PREVIOUS
NEW
52278-50030
© 2023 Toyota Motor Sales, USA
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Creak or Click Type Noise From Rear Over Bumps or When Braking
Required Tools & Equipment
SPECIAL SERVICE TOOLS (SST)
PART NUMBER
QTY
ChassisEAR™ (or Equivalent)*
JSP06608
(JS Products)
1
01413-00072 (Medium)
Insulated Glove Set, Rubber With Leather Protectors*
01413-00073 (Large)
2
01413-00074 (Extra Large)
*Essential SST.
CAUTION
ALWAYS inspect the insulated gloves before use for cracks, ruptures, tears, pinholes, or damage.
Do NOT wear if damaged.
NOTE
 A mechanic’s stethoscope or similar tool may be used in place of ChassisEAR™.
 ChassisEAR™ may be ordered by calling Approved Dealer Equipment (ADE) at 1-800-368-6787.
 Additional SSTs may be ordered by calling 1-800-933-8335.
REQUIRED TOOLS & MATERIAL
QTY
Engine Lifter or Transmission Jack
1
Torque Wrench
1
Repair Procedure
1. Confirm the condition exists.
A. Test-drive the vehicle over a speed bump or uneven surface.
B. Is there a creaking or clicking type noise from the rear of the vehicle?
 YES — Continue to step 2.
 NO — This bulletin does NOT apply.
Continue diagnosis using the applicable Repair Manual.
© 2023 Toyota Motor Sales, USA
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Creak or Click Type Noise From Rear Over Bumps or When Braking
Repair Procedure (continued)
2. Attach the ChassisEarTM (or equivalent), to the rear suspension member sub assembly
front upper, front lower stoppers and rear lower stoppers.
3. Test-drive the vehicle over a speed bump or uneven surface.
Is there a creaking or clicking type noise from the rear suspension member sub assembly
upper and/or lower stopper(s)?
HINT
Applying soapy water to the suspected stopper may temporarily diminish the noise intensity and help
identify the source of the noise.

YES — Continue to step 4.

NO — This bulletin does NOT apply.
Continue diagnosis using the applicable Repair Manual.
Figure 1. Rear Member Front Left-hand Side
Figure 2. Rear Member Front Right-hand Side
1
1
2
2
1
Front Upper Stopper
1
Front Upper Stopper
2
Front Lower Stopper
2
Front Lower Stopper
© 2023 Toyota Motor Sales, USA
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Creak or Click Type Noise From Rear Over Bumps or When Braking
Repair Procedure (continued)
Figure 3. Rear Left Hand Lower Stopper
Figure 4. Rear Right Hand Lower Stopper
1
1
1
1
Rear Lower Stopper
Rear Lower Stopper
4. Disable the high voltage system and ensure there are 0 volts present at the inspection point
BEFORE proceeding to the next steps.
Refer to TIS, applicable model and model year Repair Manual:

2021 / 2022 / 2023 Mirai:
Engine/Hybrid System – Hybrid/Battery Control System – “Hybrid / Battery Control:
Hybrid Battery System: Precaution”
5. Wearing insulated gloves, disconnect the
motor cable.
Refer to TIS, applicable model and model
year Repair Manual:
Figure 5.
2
1
1
NOTE
ONLY perform steps 24 – 25.

2021 / 2022 / 2023 Mirai:
Suspension – Rear Suspension –
“Rear Suspension: Rear Suspension
Member: Removal”
NOTE
1
Bolts
Cover the motor cable connector once it
is disconnected.
2
Motor Cable
© 2023 Toyota Motor Sales, USA
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Creak or Click Type Noise From Rear Over Bumps or When Braking
Repair Procedure (continued)
6. Use an engine lifter or transmission jack to
support the rear suspension member
sub assembly.
Figure 6.
1
1
1
1
1
Support Locations
7. Remove all four rear suspension member sub assembly bolts.
8. Lower the rear suspension member sub
assembly until there is enough clearance
to remove and replace the front
upper stoppers.
Figure 7. Remove the Upper Stopper
1
1
© 2023 Toyota Motor Sales, USA
Front Upper Stopper
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Creak or Click Type Noise From Rear Over Bumps or When Braking
Repair Procedure (continued)
9. Remove and replace ALL four
lower stoppers, ensuring correct placement
of stoppers.
Figure 8.
1
1
2
2
1
Rear Lower Stoppers
2
Front Lower Stoppers
10. Refer to the stamped marking on the lower stoppers. RR is for the rear lower stopper, and U
is for the front lower stopper, as shown below.
Figure 9. Rear Lower Stopper
Figure 10. Front Lower Stopper
© 2023 Toyota Motor Sales, USA
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Creak or Click Type Noise From Rear Over Bumps or When Braking
Repair Procedure (continued)
11. Raise the rear suspension member sub assembly until there is no clearance between the rear
suspension member sub assembly and the vehicle body.
12. Install and torque all four rear suspension member sub assembly bolts.
Torque: 135 N·m {1377 kgf·cm, 100 ft·lbf}
13. Wearing insulated gloves, reinstall the motor cable.
Refer to TIS, applicable model and model year Repair Manual:
NOTE
ONLY perform steps 33 – 34.

2021 / 2022 / 2023 Mirai:
Suspension – Rear Suspension – “Rear Suspension: Rear Suspension
Member: Installation”
14. Wearing insulated gloves, connect the the FC converter power outlet cable.
Refer to TIS, applicable model and model year Repair Manual:
NOTE
ONLY perform steps 13 and 23.

2021 / 2022 / 2023 Mirai:
Engine/Hybrid System – Hybrid/Battery Control System – “Hybrid / Battery Control:
Inverter With Converter: Installation”
15. Wearing insulated gloves reinstall the service plug grip.
Refer to TIS, applicable model and model year Repair Manual:

2021 / 2022 / 2023 Mirai:
Engine/Hybrid System – Hybrid/Battery Control System – “Hybrid / Battery Control:
Service Plug Grip: Installation”
© 2023 Toyota Motor Sales, USA
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July 25, 2023
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Creak or Click Type Noise From Rear Over Bumps or When Braking
Repair Procedure (continued)
16. Confirm the condition no longer exists.
A. Test-drive the vehicle over a speed bump or uneven surface.
B. Is there a creaking or click type noise present during braking, or when driving over speed
bumps and uneven surfaces?
 YES — Continue to step 17.
 NO — The repair is complete.
17. Support the rear suspension member assembly.
18. Loosen all four rear suspension member assembly bolts.
19. Slightly lower, then raise, the suspension member assembly.
20. Re-torque all four rear suspension member sub assembly bolts.
Torque: 135 N·m {1377 kgf·cm, 100 ft·lbf}
21. Repeat step 16.
© 2023 Toyota Motor Sales, USA