Toyota Firmware 89663-35340: Calibration Catalog Reference
A concise reference to Toyota firmware identifier 89663-35340 and its calibration part-number family.
89663-35340 is a Toyota calibration identifier in the 89663 part-number family, which is associated with engine control software. The identifier points to a software calibration rather than identifying a vehicle model by itself.
What the calibration family controls
An engine control module uses its calibration to manage operating decisions such as fuel delivery, ignition timing and emissions-related functions. Those are general roles of the controller family, not confirmed changes introduced by 89663-35340.
The complete identifier distinguishes this calibration from other Toyota software records with similar part numbers. Its exact vehicle application and any revision-specific behavior cannot be established reliably from the identifier alone.