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Today, each vehicle has numerous computers that have to communicate with one another for the vehicle to operate as designed. At the center of that communication is the Electronic Control Unit, or ECU. During some repairs, you may need to flash reprogram or replace the ECU on the engine, which could be caused by an accident or ECU failure. Some replacement ECUs are merely “plug and play” when you install the new ECU, the vehicle is good to go. Others may require quire that the new ECU’s Security Key be written in order for the ECU to communicate on the vehicle’s network.
This is true on 2022 86, Corolla Cross, Tundra, HV; 2021 - 2022 Mirai, RAV4 Prime, SiennaHV, Tundra, VenzaHV; 2023 bZ4X...
Reference.
GTS+ acquaintance • GTS+ acquaintance (new)
GTS+ and VCH • GTS+ and VCH
GTSplus part1_1 • GTSplus part1_1
GTS+ Pre-Collision System (PCS) Data • GTS+ Pre-Collision Sys...
GTSplus _ECUreflash • GTSplus _ECUreflash
ECU Security Key Writing (NA) ECU Security Key Writing (NA) • ECU Security Key Writi...
ECU Security key error • ECU Security key error
ECU Security Key Writing (Europe) • ECU Security Key Writi...
Ecu Security Key Write was done • ECU Security Key Write