T-SB-0021-25

February 10, 2025

GTS+ ECU Flash Reprogramming With Security
Signature
Service
Category

Engine/Hybrid System

Section

Engine Control

Market USA and

Mexico

Applicability
YEAR(S)

MODEL(S)

2025

4Runner HV, Crown Signia,
Prius PHV, RAV4 PHV

2022 - 2025

86, Corolla Cross, Tundra
HV

2024 - 2025

Grand Highlander, Grand
Highlander HV, Highlander,
Highlander HV, Land
Cruiser, Tacoma, Tacoma
HV

2021 - 2025

Mirai, Sienna HV, Tundra,
Venza HV

2023 - 2024

Prius Prime

2021 - 2024

RAV4 Prime

2023 - 2025

bZ4X, Corolla, Corolla Cross
HV, Corolla HV, Crown, GR
Corolla, Prius, Sequoia HV

ADDITIONAL INFORMATION

SUPERSESSION NOTICE
The information contained in this bulletin supersedes Service Bulletin No. T-SB-0107-20.
 Applicability has been updated to include 2025 model year 4Runner Hybrid, 86, bZ4X, Corolla,
Corolla Cross, Corolla Cross Hybrid, Corolla Hybrid, Crown, Crown Signia, GR Corolla,
Grand Highlander, Grand Highlander Hybrid, Highlander, Highlander Hybrid, Land Cruiser,
Mirai, Prius, Prius PHV, RAV4 PHV, Sequoia Hybrid, Sienna Hybrid, Tacoma,
Tacoma Hybrid, Tundra, Tundra Hybrid, and Venza Hybrid vehicles.
 The Parts Information section has been removed.
 Required Tools & Equipment and Operation Procedure sections have been updated.
Service Bulletin No. T-SB-0107-20 is obsolete and any printed versions should be discarded.

© 2025 Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025

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T-SB-0021-25

February 10, 2025

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GTS+ ECU Flash Reprogramming With Security Signature
Introduction

Flash reprogramming allows the Electronic Control Unit (ECU) software to be updated without
replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are released as
field-fix procedures described in individual Service Bulletins. This bulletin details the Global
Techstream+ (GTS+) ECU flash reprogramming procedures and outlines use of the Technical
Information System (TIS) and the Calibration Update Wizard+ (CUW+). To ensure the correct ECU
software is installed, ECUs will require a Security Signature before the ECU will initialize the flash
reprogramming sequence. This bulletin also details the process for acquiring a Security Signature
from TIS during the GTS+ ECU flash reprogramming process.
NOTE
ECU is a Toyota term used to describe integrated computerized devices responsible for managing the
operation of a system or subsystem. For the purposes of this bulletin, the term “ECU” is used as a generic
label for the following SAE J1930 standard references:





Powertrain Control Module (PCM)
Engine Control Module (ECM)
Transmission Control Module (TCM)
Any other Toyota specific control unit

Table of Contents



Warranty Information ...............................................................................................................3



Required Tools & Equipment ...................................................................................................3



GTS+ Preparation....................................................................................................................4


Select the Correct User Type .............................................................................................4



Confirm the Correct VIM .....................................................................................................5



Process Overview....................................................................................................................6



Operation Procedure ...............................................................................................................7

© 2025 Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025

T-SB-0021-25

February 10, 2025

Page 3 of 20

GTS+ ECU Flash Reprogramming With Security Signature
Warranty Information
OP CODE

DESCRIPTION

N/A

TIME

OFP

T1

T2

–

–

–

–

Not Applicable to Warranty

Required Tools & Equipment
SPECIAL SERVICE TOOLS (SST)

PART NUMBER

QTY

DSS-5000 Battery Diagnostic Tool*

DSS-5000P T

1

DCA-8000 Battery Diagnostic Tool*

DCA-8000P T

1

*Essential SST.

NOTE
Additional SSTs may be ordered by calling 1-800-368-6787 (USA) or 01-800-504-5330 (Mexico) or by
visiting Home – Service Resources – Toyota Special Service Tools (SSTs).
REQUIRED EQUIPMENT

SUPPLIER

Techstream ADVi*
Techstream 2.0
Techstream Lite

PART NUMBER

QTY

TSADVUNIT
ADE

Techstream Lite (Green Cable)

TS2UNIT
TSLITEPDLR01
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 (USA) or 01-55-50103041 (Mexico) or by visiting TIS – Diagnostics –
Tools & Equipment – Techstream Order Portal.
 Use Techstream or an approved J2534 interface to perform flash reprogramming updates.
Visit techinfo.toyota.com for more information regarding J2534 reprogramming.

© 2025 Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025

1

T-SB-0021-25

February 10, 2025

GTS+ ECU Flash Reprogramming With Security Signature
GTS+ Preparation
Select the Correct User Type

1. Launch GTS+.
2. From the initial login screen select the Country
and the User Type.

Figure 1.

NOTE
The appropriate User Type MUST be selected
for GTS+ to function correctly.

3. Click Server Login.

© 2025 Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025

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T-SB-0021-25

February 10, 2025

GTS+ ECU Flash Reprogramming With Security Signature
GTS+ Preparation (continued)
Confirm the Correct VIM

GTS+ software requires a VIM selection before it can be used for reprogramming.
1. Select GTS+ Settings from the Main Menu screen.
2. Select VIM Select from the GTS+
Settings menu.

Figure 2.

3. Select the correct interface setup from the
dropdown list.


Mongoose-Plus MFC3 VIM:
 Techstream Lite w/Blue & Black Case
w/Detachable Cable
 Techstream ADVi w/Grey Case



MongoosePro MFC2 VIM:
 Techstream Lite w/Green Case
 Techstream ADVi w/Black Case



MongoosePro MFC VIM:
 Techstream Lite w/Blue Case
 Techstream Lite w/Updated Clear Case
 Techstream 2.0
NOTE
The Mongoose driver MUST be installed before
Mongoose selections will be available. For
additional information, see
TIS – Diagnostics – Scantool.

4. Click the arrow in the bottom right corner.

© 2025 Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025

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T-SB-0021-25

February 10, 2025

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GTS+ ECU Flash Reprogramming With Security Signature
Process Overview

1. Verify the vehicle’s applicability for recalibration and locate the desired calibration file by
performing the GTS+ Health Check function.
NOTE
 GTS+ will automatically search TIS for the appropriate Service Bulletin using the current
calibration ID from the vehicle if the PC is connected to the network (see the figures below).
 Calibration file links can be found embedded in the corresponding Service Bulletin.
Figure 3.

Figure 4.

2. Connect the DCA-8000 battery diagnostic tool using “Power Supply Mode” ONLY.
The DCA-8000 battery diagnostic tool includes a power supply mode to help maintain battery
voltage at 13.5V during ECU reprogramming.
NOTICE
 ECU damage may occur if the correct battery charger mode setting is NOT used.
 Refer to Vehicle Reprogramming Tips for other approved chargers, located at
TIS – Diagnostics – Reprogramming – Reference Documents.
 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 tool, refer to the
DCA-8000 Instruction Manual located at TIS – Diagnostics – Tools & Equipment –
Battery Diagnostics.

© 2025 Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025

T-SB-0021-25

February 10, 2025

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GTS+ ECU Flash Reprogramming With Security Signature
Process Overview (continued)

3. Locate the appropriate calibration ID and reprogram the vehicle ECU with GTS+.
GTS+ uses the CUW+ application to open calibration files and facilitate the ECU flash
reprogramming process.
4. Attach the Authorized Modifications Label.
Modifications to ECU calibrations MUST be recorded and properly displayed on the vehicle
using the Authorized Modifications Label.

Operation Procedure

1. Verify the vehicle’s applicability for recalibration and locate the desired calibration file.
A. Connect GTS+ and establish a vehicle connection.
B. Click the Health Check button on the
Main Menu.

Figure 5.

C. A Health Check completed window opens.
To continue, click either Yes or No.

Figure 6.

(1) Click Yes to include additional
information in the Health Check.
(2) Click No if additional information is
NOT desired.

© 2025 Toyota Motor Sales, USA
Submitted to NHTSA on 03/07/2025

T-SB-0021-25

February 10, 2025

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