Toyota Firmware 89663-3A231: Calibration Catalog
A concise catalog reference for Toyota and Lexus firmware calibration 89663-3A231.
89663-3A231 is a Toyota-format software calibration identifier in the 89663 part-number family, which is associated with engine control module calibrations. Its exact vehicle application and the changes made by this revision are not established here.
What the calibration family controls
An engine control module uses calibration data to manage engine operation, including fuel delivery and ignition timing, in response to operating conditions. These are functions of the controller family, not confirmed changes introduced by calibration 89663-3A231.
The complete identifier matters when comparing service or catalog records. A calibration with a similar prefix is not necessarily intended for the same application or revision.