Toyota and Lexus Firmware 89663-30T50-B

89663-30T50-B is a Toyota or Lexus firmware identifier related to the catalog entry 89663-30T50. The 89663 part-number family is associated with engine control module calibrations, so this entry tentatively belongs to the engine control system.

Engine control software manages functions such as fuel delivery, ignition timing and emissions control. The related catalog name does not establish which vehicle uses this calibration or what the -B designation changes, so those general controller functions should not be treated as a description of this particular revision.