TSB011120Rev1
Service Bulletin Details
Public Details for: TSB011120Rev1
Tsb: 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 repla
Models from 2023
2023 TOYOTA BZ4X |
Models from 2022
Models from 2021
2021 TOYOTA MIRAI |
2021 TOYOTA RAV4 PRIME |
2021 TOYOTA SIENNA |
2021 TOYOTA SIENNA HYBRID |
2021 TOYOTA TUNDRA |
2021 TOYOTA VENZA |
2021 TOYOTA VENZA HYBRID |
T-SB-0111-20 Rev1 November 6, 2020 ECU Security Key Writing Service Category Power Source/Network Section Networking Market USA Applicability YEAR(S) MODEL(S) 2022 86, Corolla Cross, Tundra HV 2021 - 2022 Mirai, RAV4 Prime, Sienna HV, Tundra, Venza HV 2023 bZ4X ADDITIONAL INFORMATION REVISION NOTICE July 08, 2022 Rev1: Applicability has been updated to include 2022 model year 86, Corolla Cross, Mirai, Tundra, and Tundra HV vehicles and 2023 model year bZ4X vehicles. Any previous printed versions of this bulletin should be discarded. Introduction 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. Figure 1. © 2022 Toyota Motor Sales, USA Page 1 of 9 T-SB-0111-20 Rev1 November 6, 2020 Page 2 of 9 ECU Security Key Writing Warranty Information OP CODE DESCRIPTION TIME OFP T1 T2 N/A Not Applicable to Warranty – – – – 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 17.10.012 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. Procedures Confirm ECU Security Key Writing Requirement ........................................................................ 3 Health Check ....................................................................................................................... 3 ECU Security Key Button ..................................................................................................... 4 ECU Security Key Writing Process ............................................................................................ 5 © 2022 Toyota Motor Sales, USA T-SB-0111-20 Rev1 November 6, 2020 Page 3 of 9 ECU Security Key Writing 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. 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. Figure 2. © 2022 Toyota Motor Sales, USA T-SB-0111-20 Rev1 November 6, 2020 Page 4 of 9 ECU Security Key Writing Confirm ECU Security Key Writing Requirement (continued) ECU Security Key Button Selecting the ECU Security Key Button is another method to confirm if ECU security key writing is required. From the System Select screen, the ECU Security Key button is located on the left-hand side of the function menu. NOTE Selecting this option can allow ECU security key writing even if it is not required. If the ECU security key does NOT need to be written, a message will appear stating “ECU Security Key is already registered.” Figure 3. © 2022 Toyota Motor Sales, USA T-SB-0111-20 Rev1 November 6, 2020 Page 5 of 9 ECU Security Key Writing ECU Security Key Writing Process NOTE The process outlined in this section will use the Health Check Result screen to confirm if ECU security key writing is required. 1. Connect Techstream to the vehicle and press Next. NOTE In some instances, automatic vehicle detection may not be available due to specific ECU replacement. If the vehicle information does NOT automatically populate, manually select the appropriate vehicle information. Figure 4. © 2022 Toyota Motor Sales, USA T-SB-0111-20 Rev1 November 6, 2020 Page 6 of 9 ECU Security Key Writing ECU Security Key Writing Process (continued) 2. Perform a Health Check. If the ECU Security Key indicator in the upper right corner of the Health Check screen displays “Necessary,” press the ECU key button located on the bottom of the screen. Figure 5. © 2022 Toyota Motor Sales, USA T-SB-0111-20 Rev1 November 6, 2020 Page 7 of 9 ECU Security Key Writing ECU Security Key Writing Process (continued) 3. Select Next. Figure 6. 4. Techstream will read the vehicle information and open TIS to download the ECU security key. Input your TIS login credentials and select Login. Figure 7. © 2022 Toyota Motor Sales, USA T-SB-0111-20 Rev1 November 6, 2020 Page 8 of 9 ECU Security Key Writing ECU Security Key Writing Process (continued) 5. Select Send. Figure 8. 6. After pressing Send, TIS will automatically send the ECU security key to Techstream. Return to Techstream and wait for the writing process to complete. Figure 9. © 2022 Toyota Motor Sales, USA T-SB-0111-20 Rev1 November 6, 2020 Page 9 of 9 ECU Security Key Writing ECU Security Key Writing Process (continued) 7. Cycle the ignition to IG-OFF, and then IG-ON. Select Next. Figure 10. 8. Select OK. Figure 11. 9. Confirm the ECU security key has been properly written by performing a Health Check and confirming the ECU security key indicator shows “-”, and then clear ALL DTCs. Figure 12. NOTE The ECU security key indicator will show “Necessary” if the security key was NOT written properly. If NOT written properly, return to step 2. © 2022 Toyota Motor Sales, USA