Toyota Firmware 89663-52U12: Calibration Catalog Reference
Catalog reference for Toyota firmware 89663-52U12 and its electronic control calibration identifier.
89663-52U12 is a Toyota electronic control calibration identifier. The 89663 part-number family is associated with engine and powertrain control software, which governs functions such as fuel delivery, ignition and emissions control.
That family association is tentative for this exact calibration. The identifier alone does not establish its vehicle application, the behavior changed by this revision or compatibility with a particular control module.