Toyota Firmware 89663-39523
Catalog reference for Toyota firmware 89663-39523 and its calibration identifier.
89663-39523 is a Toyota automotive firmware calibration identifier. The 89663 part-number family is associated with engine control software, so this entry tentatively belongs to an engine control module calibration.
An engine control module manages functions such as fuel delivery, ignition timing and emissions control using sensor inputs and programmed calibration data. The identifier alone does not establish which of those functions this particular revision changes, or which vehicle it fits.