Toyota Firmware 89663-42664: Calibration Catalog Reference
A concise catalog reference for Toyota firmware identifier 89663-42664 and its calibration-number family.
89663-42664 is a Toyota calibration identifier in the 89663 part-number family, which is associated with engine control module software. The identifier alone does not reliably establish the exact vehicle application or the operating change made by this calibration.
Engine control software manages functions such as fuel delivery and ignition timing using information from sensors and other vehicle systems. That describes the controller family’s general role, not a confirmed feature or revision introduced by 89663-42664.