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Toyota ECU Flash Reprogramming and ECU Security Key
Recently, I have received numerous questions from forum members, and my friends are also facing significant challenges with their Toyota vehicles after replacing a new ECU, as the car fails to start. They are not familiar with Toyota ECU Flash Reprogramming and EUC Security Key. That's why today, I will touch upon this topic to help you all gain a better understanding of Toyota. I sincerely hope that this discussion can be of assistance to many people.
1. Toyota ECU Flash Reprogramming
First, you need to understand required Tools & Equipment for Toyota ECU Flash Reprogramming and ECU Security Key
1.1. Required Tools & Equipment
1.1.1. Techstream Lite, designed for independent users, enables the Techstream diagnostic software to run on your PC, provided that it meets the minimum PC requirements, allowing you to service Toyota, Scion, and Lexus vehicles. Techstream Lite serves as a cost-effective alternative to the full TIS techstream system while providing factory-level support for Toyota, Scion, and Lexus vehicle
- + Toyota, Scion, and Lexus an reprogrammed using Techstream Lite. The available ECU updates are specified in the current Technical Service Bulletin (TSB) and can be accessed by obtaining a login account here: Toyota Access Online. For vehicles in the European, General, Japan, and North American markets, you can access the necessary information using the provided login account.
- + Techstream Lite, is currentl the most popular choice among technicians worldwide.
- + Toyota Techstream lastest version is v18.00.008.
- + Techstream Lite provides support for most J2534 Passthru devices available today, such as Mongoose, VCM2, MDI2, VXDIAG, scanmatik, Tatrix openport 2.0, Autel VCI, Cadaq 3, and many others.
1.1.2. TIS Techstream ADVi (almost like TIS 2.0 online), designed for dealers, integrates the capabilities of TIS and the scantool into a single portable device. With Techstream ADVi, technicians can conveniently view and analyze on-board vehicle data, access relevant TIS service documents, and reprogram vehicles, all from the driver's seat through a wireless connection to TIS.Techstream ADVi is the replacement for the Techstream 2.0, TIS Techstream and Diagnostic Tester and can be used for 1996 – current Toyota*/Scion/Lexus vehicles marketed in North America
1.2. ECU Flash Reprogramming
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 Techstream ECU flash reprogramming process and outlines use of TIS and the Calibration Update Wizard (CUW). To ensure the correct ECU software is installed, ECUs will require a Security Signature before the ECU initializes the flash reprogramming sequence. This bulletin also details the process for acquiring a Security Signature from TIS during the Techstream ECU flash reprogramming process.
When certain vehicle ECUs are replaced, the ECU security key must be written in order for that ECU to communicate on the vehicle network. The Techstream Software Health Check Results screen has been enhanced to help identify if a replacement ECU requires an ECU security key. Follow the procedures in this bulletin to write the ECU security key to the replacement ECU.
- 2023 Corolla Cross L
- 2022 Corolla Cross LE
- 2022 Corolla Cross XLE
- 2022 GR86
- 2022 GR86 Premium
- 2021-2023 Mirai Limited
- 2021-2023Mirai XLE
- 2021-2023RAV4 Prime SE
- 2021-2023RAV4 Prime XSE
- 2021-2023Sienna LE
- 2021-2023Sienna Limited
- 2021-2023Sienna Platinum
- 2022 Sienna Woodland Edition
- 2021-2023Sienna XLE
- 2021-2023Sienna XSE
- 2021-2023Tundra 1794 Edition
- 2022 Tundra Capstone
- 2021-2023Tundra Limited
- 2021 Tundra Nightshade
- 2021-2023Tundra Platinum
- 2021-2023Tundra SR
- 2021-2023Tundra SR5
- 2021 Tundra Trail
- 2021-2023Tundra TRD Pro
- 2021-2023Venza LE
- 2021-2023Venza Limited
- 2021-2023 Venza XLE
- Only ONE of the Techstream units listed above is required.
- Software lastest version TECHSTREAM V18.00.008 or later is required.
- Additional Techstream units may be ordered by calling Approved Dealer
- Use Techstream or an approved J2534 interface to perform flash reprogramming updates.
- Visit Toyota Security Key for more information about Access Toyota Security Key.
2.3. Confirm ECU Security Key Writing Requirement
After ECU replacement, it is important to confirm if ECU security key writing is necessary. There are two methods available to confirm if the ECU security key writing function is required within the Techstream software: performing a Health Check and using the ECU Security Key button.
2.4. Health Check
Performing a Health Check will confirm if ECU security key writing is needed. The Techstream Health Check Results screen has been enhanced to include an ECU security key indicator. The ECU security key indicator will display “Necessary” when an ECU security key needs to be written and “-” when ECU security key writing is NOT required.
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