Toyota 89663-0H101 Firmware: Calibration Identifier
A concise reference to Toyota firmware identifier 89663-0H101 and its calibration part-number family.
89663-0H101 is a Toyota software calibration identifier in the 89663 part-number family. That family is associated with engine control module software, which manages engine operation and communicates with other vehicle systems.
The identifier alone does not establish the exact vehicle application or the behavior changed by this calibration. Its association with engine control software is therefore tentative, rather than a confirmed description of a particular revision.