Toyota and Lexus Firmware 89663-30U91
A catalog reference for Toyota and Lexus firmware identifier 89663-30U91 and its ECU calibration family.
89663-30U91 is a Toyota and Lexus electronic control unit calibration identifier. The 89663 part-number family is associated with engine control software, which manages functions such as fuel delivery, ignition timing and emissions control.
The complete identifier distinguishes this calibration from other entries in the same family. Its exact vehicle application and the behavior specific to this revision cannot be established from the identifier alone. The general engine-control functions of the family should not be read as evidence of a particular change made by 89663-30U91.