Toyota Firmware 89663-FA340-A

89663-FA340-A is a Toyota firmware identifier related to the catalog entry 89663-FA340. The 89663 part-number family is generally associated with engine control software, although the specific controller application and vehicle fitment for this identifier remain tentative.

An engine control module manages functions such as fuel delivery and ignition timing using sensor information and programmed calibration data. The related catalog name does not establish which of those functions this particular firmware revision changes. The suffix -A distinguishes the full identifier, but it does not by itself establish a stock or modified variant.