Toyota and Lexus Firmware 89663-FAJ30
A catalog reference for Toyota and Lexus calibration identifier 89663-FAJ30 and its tentative engine-control software association.
89663-FAJ30 is a Toyota or Lexus firmware calibration identifier. Its 89663 part-number family is associated with engine control module software, so an engine-control application is a tentative association for this entry.
In general, an engine control module uses sensor inputs to manage engine operation, including fuel delivery and ignition timing. That describes the controller family, not a verified change made by calibration 89663-FAJ30. The exact vehicle application and the behavior of this particular revision cannot be established from the identifier alone.