Toyota 89665-0E431 Engine Control Firmware
Learn about Toyota 89665-0E431 engine control firmware and its association with Highlander and Sienna service records.
Toyota firmware 89665-0E431, recorded under the full calibration identifier 896650E43100, belongs to the engine control module family. The engine control module manages engine operation using sensor inputs to control functions such as fuel delivery and ignition timing. Its calibration affects how those controls respond during driving.
Service record context
Toyota service record T-TCI-5072, released on December 15, 2020, lists 896650E43100 as an updated engine control module calibration. The bulletin covers 2017 and 2018 Toyota Highlander and Sienna models. That model list describes the bulletin’s overall scope, not confirmed fitment of this calibration to every vehicle in the list.
The available record does not identify the bulletin’s service concern or the specific change made by this revision. The engine-management functions described above are the module’s general role, rather than changes established for 89665-0E431.