Toyota and Lexus Firmware 89663-06R20
A catalog reference for Toyota and Lexus firmware identifier 89663-06R20 and its tentative engine control calibration family.
89663-06R20 is a Toyota firmware calibration identifier associated tentatively with the engine control module (ECM) calibration part-number family. An ECM manages engine operation using sensor inputs to control functions such as fuel delivery, ignition timing and emissions-related systems.
The full identifier distinguishes this calibration from other entries in the same family. The available identifier alone does not establish the exact vehicle application, engine or behavior changed by this revision.