Toyota and Lexus Firmware 89663-3A250
A catalog reference for Toyota and Lexus calibration 89663-3A250 and its related 89663-3A250-A entry.
89663-3A250 is a Toyota or Lexus firmware calibration identifier in the 89663 part-number family, which is associated with engine control module software. The specific vehicle application and the functions changed by this calibration are not established by the identifier alone.
Engine control software generally manages fuel delivery, ignition timing and other engine operating parameters. That describes the controller family, not a confirmed change introduced by 89663-3A250.
Related catalog identifier
The related entry 89663-3A250-A shares the complete calibration identifier and adds an -A suffix. The suffix identifies a catalog variant, but its meaning and any difference in behavior are not specified.