NHTSA ID Number: 10220144
Manufacturer Communication Number: TSB004622
TSB/Document Date: 2022-09-15
Summary
TSB: Some 2016 ? 2019 model year Mirai vehicles may exhibit a warning message, ?FC malfunction, return vehicle to dealer for service.? This message is accompanied by Diagnostic Trouble Code (DTC) P1DEF (450 FC Stack Performance). The Fuel Control Module (FCM) calibration has been revised to address this condition
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- Restores fuel economy
- Stabilizes ethanol
- Maximizes horsepower
- Improves responsiveness
- For use in both gasoline and diesel engines
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TSB/Document ID: TSB004622
Replacement Service Bulletin Number:
MFR Communication Date: 2022-05-05
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: FUEL SYSTEM, GASOLINE
MFR Component System:
MFR Component Subsystem:
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T-SB-0046-22
May 5, 2022
MIL ON DTC P1DEF - Fuel Cell Performance
Service
Category
Engine/Hybrid
System
Section
Engine Control
Market USA
Applicability
YEAR(S)
MODEL(S)
2016 - 2019
Mirai
ADDITIONAL INFORMATION
SUPERSESSION NOTICE
The information contained in this bulletin supersedes Service Bulletin No. T-SB-0318-17.
The Repair Procedure section has been updated.
Service Bulletin No. T-SB-0318-17 is obsolete and any printed versions should be discarded.
Introduction
Some 2016 – 2019 model year Mirai vehicles may exhibit a warning message, “FC malfunction,
return vehicle to dealer for service.” This message is accompanied by Diagnostic Trouble Code
(DTC) P1DEF (450 FC Stack Performance). The Fuel Control Module (FCM) calibration has been
revised to address this condition.
Production Change Information
This bulletin applies to vehicles produced BEFORE the Production Change Effective VINs
shown below.
MODEL
MODEL YEAR
PRODUCTION CHANGE EFFECTIVE VIN
Mirai
2019
JTDBVRBD8KA007354
© 2022 Toyota Motor Sales, USA
Page 1 of 8
T-SB-0046-22
May 5, 2022
Page 2 of 8
MIL ON DTC P1DEF - Fuel Cell Performance
Warranty Information
OP CODE
DESCRIPTION
TIME
OFP
EG1705
Reprogram FCM
0.4
898A1-####*
EG1706
R & R FC Stack Assembly
6.9
T1
T2
8B
99
1A100-77040
Combo A
Reprogram FCM
0.3
*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 Vehicle System Component 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
MODEL YEAR
PART NAME
QTY
1A100-77040
Stack Assy, FC
1
1A1A1-77020
Label, FC Stack Caution, No.1
1
PREVIOUS
NEW
90301-10026
2
90301-09037
1
Ring, O
2016 – 2019
90301-99207
1
90301-11036
1
G9A2A-62010
Gasket, FC Converter Service Hole, Rear
1
G9A2B-62010
Gasket, FC Converter, Rear
1
58137-62010
Seal, Front Floor Hole
1
08887-02909
FC Grease
1
0416A-56010
Element Kit, Ion Exchanger
1
00272-SLLC2
Super Long Life Coolant
1
08889-01502
FC Stack Coolant 50
5
© 2022 Toyota Motor Sales, USA
T-SB-0046-22
May 5, 2022
Page 3 of 8
MIL ON DTC P1DEF - Fuel Cell Performance
Parts Information (continued)
PART NUMBER
MODEL YEAR
PREVIOUS
2016
898A1-62020
898A1-62021
2017
898A1-62021
898A1-62022
898A1-62023
898A1-62024
2018
898A1-62024
898A1-62025
2019
898A1-62025
–
PART NAME
QTY
Computer, Fuel Cell Control
–
Authorized Modifications Labels
1
NEW
898A1-62026
00451-00001-LBL
NOTE
The FCM should NOT be replaced as part of the Repair Procedure.
Authorized Modifications Labels may be ordered in packages of 25 from the Materials
Distribution Center (MDC) through Dealer Daily – Parts – Dealer Support Materials Orders.
Required Tools & Equipment
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.
Software version 17.00.020 or later is required.
Additional Techstream units may be ordered by calling Approved Dealer
Equipment (ADE) at 1-800-368-6787.
Use Techstream or an approved J2534 interface to perform flash reprogramming updates.
Visit techinfo.toyota.com for more information regarding J2534 reprogramming.
SPECIAL SERVICE TOOLS (SST)
PART NUMBER
QTY
Battery Diagnostic Tool*
DCA-8000P T
1
*Essential SST.
NOTE
Additional SSTs may be ordered by calling 1-800-933-8335.
© 2022 Toyota Motor Sales, USA
T-SB-0046-22
May 5, 2022
Page 4 of 8
MIL ON DTC P1DEF - Fuel Cell Performance
Calibration Information
CALIBRATION ID
- [2026 Top-Tier Hardware and Software Upgrade]: Topdon ArtiDiag900 Lite scanner has enhanced hardware and latest features, including Android 11.0, 5x faster CPU, 10000mAh battery for 12 hours of continuous operation, stable wireless diagnosis with Bluetooth 5.0, 8-inch touchscreen. Added bi-directional control, wireless diagnosis, battery testing (optional), and DTC repair guide
- [TOPDON Bidirectional Scan Tool]: This bidirectional obd2 scanner sends commands to the vehicle's ECU for active testing, enabling users to accurately and quickly locate faulty components such as injectors, coolant pumps, windows, wipers, headlights, mirrors, etc. The bidirectional control scanner is the ideal choice for workshops/automotive repair shops as it significantly reduces mechanic's diagnostic time.
- [Wireless Bluetooth Diagnostic Experience]: The AD900 Lite scan tool comes with a Bluetooth 5.0 VCI, supporting a wireless diagnostic range of up to 33 feet (10 meters), allowing you to diagnose without being confined to cables or tight spaces. Stable and fast wireless diagnosis provides a comfortable repair environment. It also offers VCI cables to increase connectivity options.
- [DTC Repair Guide Function]: Easily diagnose issues with your vehicle and receive guidance on repairs with the topdon scan tool's fault code definitions for all systems,maximize your diagnostic capabilities. This function is compatible with Chrysler
/Dodge/Jeep/Fiat 2010-2014 and expanding with continual updates,the AritDiag 900 Lite car diagnostic scanner is the must-have tool for any technician or DIY enthusiast. - [OE-Level Full System Diagnostics]:AritDiag900 Lite full system diagnostic scanner can scan ALL available modules(Engine, Transmission, Airbag, ABS, ESP, TPMS, Gateway, Steering, Radio, Air conditioning, ect.) to✔read ECU info, ✔read/clear codes, ✔view live data stream, ✔retrieves freeze-frame, ✔perform active tests, and more. With just a simple click, it provides you with accurate and in-depth diagnostics.
- Dual WiFi & 10.1" Touchscreen: Provides a stable, high-speed wireless link 3x faster than bluetooth, and a responsive, professional interface. Topdon ONE obd2 scanner diagnostic tool ensures smooth, non-lagging diagnostic scan, boosting mechanic efficiency
- J2534 Pass-Thru Support: The included ONE VCI supports the J2534 standard, allowing it to function as a pass-thru device when paired with OEM diagnostic software.Through TOPDON’s RLink platform, technicians can perform dealer-level coding, expanding in-house capabilities without investing in multiple factory automotive scan tools
- OE Topology Mapping: Visualize the vehicle’s ECU network exactly as it’s built.Zoom, pan, and highlight specific modules to pinpoint component issues with precision.Topology mapping displays real-time communication between modules
- Topfix AI Assistant: Covers 5 million plus fault codes and delivers instant causes, symptoms, and repair guidance with professional wiring diagrams for each code.Slashes diagnostic time, boosts first-time fix accuracy, and increases shop revenue
- 50 Plus Service Functions: Covers high-demand services like ADAS calibration, DPF regen, TPMS reset, ABS bleed, and throttle adaptation.Expands your service menu, allows you to charge premium rates, and turns away zero jobs due to lack of tooling. Vehicle-specific functionality may vary.
- Bi-Directional Control, Quickly Locate Problems: Turn your phone into a professional diagnostic tool. You can send commands from your phone to the ECU to test injectors, cooling fans, headlights, A/C clutch, windows, wipers, and more. See which one doesn't respond. Helps you quickly locate the problem and save time. No need to tear things apart, avoid blind disassembly.
- Full System Diagnostics, No Fault Hides: Unlike basic diagnostic tools that only cover 4 systems, TopScan can scan all systems. Read and clear trouble codes, view live data streams, and generate a complete vehicle health report – all issues are clear at a glance. Covers 10,000+ vehicle models and is compatible with 99.99% of vehicles.
- Flexible Subscription, Choose Advanced Features as Needed: TopScan Lite provides free-for-life access to core diagnostics, including full system scan, code reading, performance tests, and repair information. After purchase, advanced features (bi-directional control, service operations, live data, code clearing, and AI functions) are free-for-the-first-year. After the first year, if you want to use advanced features, you need to subscribe on a monthly, quarterly, or yearly basis. As new models and reset functions are updated, the tool will also be continuously upgraded.
- AI Assistant - TopFix: Think of TopFix as your personal AI mechanic. It leverages a repair database and OEM data to deliver clear, step-by-step repair solutions. Features include AI Q&A, one-click translation, and a full repair log, making your diagnostic process simpler and more efficient.
- 8+ Hot Resets, Keep Your Car in Top Shape: One-tap resets for oil, throttle, EPB, steering angle, DPF, ABS, BMS, and airbag. It enables car owners to easily perform essential maintenance, ensuring the vehicle stays in optimal condition and extends its service life.
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