NHTSA ID Number: 11016792
Manufacturer Communication Number: T-SB-0043-23 Rev1
TSB/Document Date: 2025-04-08
Summary
Some 2021 – 2022 model year Mirai vehicles may exhibit a MIL ON condition with one or both of the following Diagnostic Trouble Codes (DTCs) present: •P1F6C71 – Air Sealing Valve Actuator Stuck •P1F6E71 – Air Pressure Regulating Valve Actuator Stuck The EV control computer logic has been modified to reduce the possibility of this condition.
T-SB-0043-23
Rev1
July 10, 2023
MIL ON With DTC(s) P1F6C71 and/or P1F6E71
Service
Category
Section
Engine Control
Market USA
Applicability
YEAR(S)
MODEL(S)
2021 - 2022
Mirai
ADDITIONAL INFORMATION
REVISION NOTICE
February 20, 2025 Rev1:
The Warranty Information, Parts Information, Required Tools & Equipment, and
Repair Procedure sections have been updated.
Any previous printed versions of this bulletin should be discarded.
Introduction
Some 2021 – 2022 model year Mirai vehicles may exhibit a MIL ON condition with one or both of
the following Diagnostic Trouble Codes (DTCs) present:
P1F6C71 – Air Sealing Valve Actuator Stuck
P1F6E71 – Air Pressure Regulating Valve Actuator Stuck
The EV control computer logic has been modified to reduce the possibility of this condition.
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#PA007624
© 2025 Toyota
Motor Sales, USA
Submitted to NHTSA on 03/07/2025
Page 1 of 6
T-SB-0043-23
Rev1
July 10, 2023
Page 2 of 6
MIL ON With DTC(s) P1F6C71 and/or P1F6E71
Warranty Information
OP CODE
DESCRIPTION
TIME
EL2304
Reprogram the EV Control Computer
0.5
Combo A
R & R Air Sealing Valve (for DTC P1F6C71 Only)
1.0
Combo B
R & R Air Pressure Regulating Valve
(for DTC P1F6E71 Only)
2.0
OFP
T1
T2
89981-#####*
8A
74
*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 Fuel Cell System Warranty. This warranty is in effect
for 96 months or 100,000 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
Computer, EV Control
–
17C10-77030
Regulator Assy, Fuel Cell Air Pressure
1
17C10-76010
Regulator Assy, Fuel Cell Air Pressure, No.2
1
1A495-77020
Gasket, FC Stack Air, No. 5
2*
PREVIOUS
NEW
89981-62110
89981-62260
89981-62120
89981-62270
89981-62150
89981-62280
89981-62160
89981-62290
89981-62170
89981-62300
*Two gaskets are needed per regulator assembly (valve). If two regulator assemblies need to be replaced, four gaskets
will be needed.
NOTE
The EV control computer should NOT be replaced as part of the Repair Procedure.
© 2025 Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025
T-SB-0043-23
Rev1
July 10, 2023
Page 3 of 6
MIL ON With DTC(s) P1F6C71 and/or P1F6E71
Required Tools & Equipment
SPECIAL SERVICE TOOLS (SST)
PART NUMBER
QTY
DCA-8000 Battery Diagnostic Tool*
DCA-8000P T
1
*Essential SST.
NOTE
Additional SSTs may be ordered by calling 1-800-368-6787 or by visiting
Home – Service Resources – Toyota Special Service Tools (SSTs).
REQUIRED EQUIPMENT
SUPPLIER
Techstream ADVI*
PART NUMBER
QTY
TSADVUNIT
Techstream 2.0
TS2UNIT
ADE
1
Techstream Lite
TSLITEPDLR01
Techstream Lite (Green Cable)
TSLP2DLR01
*Essential SST.
NOTE
Only ONE of the Techstream units listed above is required.
GTS+ software version 2024.04.004.02 or later is required.
Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787 or by visiting TIS – Diagnostics – Tools & Equipment – Techstream Order Portal.
© 2025 Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025
T-SB-0043-23
Rev1
July 10, 2023
Page 4 of 6
MIL ON With DTC(s) P1F6C71 and/or P1F6E71
Calibration Information
CALIBRATION ID
MODEL
CALIBRATION ID #
PREVIOUS
CID 1
CID 2
CID 1
CID 2
CID 1
Mirai
3KM
CID 2
CID 1
CID 2
CID 1
CID 2
© 2025 Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025
899836211500
899836211400
899836211300
899836211200
899836211100
899836211000
899856202100
899856202000
899836212500
899836212400
899836212300
899836212200
899836212100
899836212000
899856202100
899856202000
899836215500
899836215400
899836215300
899836215200
899836215100
899836215000
899856202100
899856202000
899836216500
899836216400
899836216300
899836216200
899836216100
899836216000
899856202100
899856202000
899836217500
899836217400
899836217300
899836217200
899836217100
899836217000
899856204100
899856204000
NEW
899836211600 /
899856202200
899836212600 /
899856202200
899836215600 /
899856202200
899836216600 /
899856202200
899836217600 /
899856204200
T-SB-0043-23
Rev1
July 10, 2023
Page 5 of 6
MIL ON With DTC(s) P1F6C71 and/or P1F6E71
Repair Procedure
1. Confirm the condition exists.
Does the vehicle exhibit a MIL ON condition with one or both of the following DTCs present?
P1F6C71 – Air Sealing Valve Actuator Stuck
P1F6E71 – Air Pressure Regulating Valve Actuator Stuck
YES — Continue to step 2.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
2. Use GTS+ to confirm if the EV control computer calibration has been updated.
Is the calibration ID listed in GTS+ the latest calibration?
YES — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
NO — Continue to step 3.
3. Determine if the air sealing valve requires replacement.
Is DTC P1F6C71 present?
YES — Continue to step 4.
NO — Go to step 6.
4. Remove the air sealing valve.
Refer to TIS, applicable model and model year Repair Manual:
2021 – 2022 Mirai:
Engine / Hybrid System – Intake / Exhaust – Air Control Valve – Removal
5. Install the NEW air sealing valve.
Refer to TIS, applicable model and model year Repair Manual:
2021 – 2022 Mirai:
Engine / Hybrid System – Intake / Exhaust – Air Control Valve – Installation
6. Determine if the air pressure regulating valve requires replacement.
Is DTC P1F6E71 present?
YES — Continue to step 7.
NO — Go to step 9.
© 2025 Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025
T-SB-0043-23
Rev1
July 10, 2023
Page 6 of 6
MIL ON With DTC(s) P1F6C71 and/or P1F6E71
Repair Procedure (continued)
7. Remove the air pressure regulating valve.
Refer to TIS, applicable model and model year Repair Manual:
2021 – 2022 Mirai:
Engine / Hybrid System – Intake / Exhaust – Air Control Valve – Removal
8. Install the NEW air pressure regulating valve.
Refer to TIS, applicable model and model year Repair Manual:
2021 – 2022 Mirai:
Engine / Hybrid System – Intake / Exhaust – Air Control Valve – Installation
9. Reprogram the EV control computer.
NOTE
The battery diagnostic tool MUST be used in Power Supply Mode to maintain battery voltage at
13.5V while flash reprogramming the vehicle.
For details on how to use the battery diagnostic station, refer to the DCA-8000 Instruction Manual
located at TIS – Diagnostics – Tools & Equipment – Battery Diagnostics.
Follow the procedures outlined in T-SB-0107-20, ECU Flash Reprogramming With Security
Signature, and flash reprogram the EV control computer with the NEW calibration file update.
10. Using GTS+, clear ANY DTCs and confirm the condition is no longer present.
NOTE
It may be necessary to turn the ignition switch OFF and wait for 10 minutes or more for ALL DTCs
to clear.
© 2025 Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025
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TSB/Document ID: T-SB-0043-23 Rev1
Replacement Service Bulletin Number:
MFR Communication Date: 2025-02-20
MFR Internal Campaign ID/Software Version: T-SB-0043-23 Rev1
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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