Toyota 89663-01031 89663-01032.cuw Firmware Catalog Reference
A catalog reference for Toyota firmware identifiers 89663-01031 and 89663-01032 and their likely engine control module family.
89663-01031 89663-01032.cuw is a Toyota firmware catalog entry associated with the 89663 calibration-number family. That family is commonly used for engine control module software, which manages engine operation using sensor readings and programmed control strategies. The exact vehicle application and the changes represented by these two identifiers are not established by the catalog names alone.
How to read the identifiers
89663-01031 and 89663-01032 appear as related catalog entries. Their similar numbering suggests an association, but it does not establish that one replaces the other or identify a specific software change. The .cuw filename identifies the cataloged firmware file, not a vehicle fitment by itself.
An engine control module generally coordinates functions such as fuel delivery and ignition timing to keep the engine running under changing conditions. That is the controller family's general role, not a description of a confirmed change in either listed calibration. No stock or modified variant label is included in the catalog names.