Toyota and Lexus Firmware 89663-42731: Calibration Catalog
A catalog overview of firmware 89663-42731 and its stock, MOD, TUN and E2 filename variants.
89663-42731 is a Toyota calibration identifier in a part-number family associated with engine control software. The exact vehicle application and the behavior controlled by this calibration cannot be established from the identifier and filenames alone.
An engine control module generally uses calibration data to manage functions such as fuel delivery, ignition timing and emissions control. That general role does not establish what this particular revision changes.
Catalog variants
The catalog includes 89663-42731.bin and 89663-42731-.bin without a modification label. Their filenames do not establish whether their contents are identical or confirm that either file is stock.
The files 89663-42731-_MOD.bin and 89663-42731-TUN.bin carry labels commonly associated with modified or tuned software. The corresponding 89663-42731-_MOD_E2.bin and 89663-42731-TUN_E2.bin filenames add an E2 label. The filenames do not define the changes or what E2 does in practice.