Toyota Firmware 89663-YWK01: Calibration Catalog Entry

SW#89663-YWK01- MOD_E2.bin is a firmware file associated with the Toyota calibration identifier 89663-YWK01. The 89663 part-number family is commonly associated with engine control software, so an engine control module application is plausible, but the complete identifier does not establish the exact vehicle or function here.

In general, engine control software manages functions such as fuel delivery and ignition timing using sensor inputs. That general role does not establish what this particular file controls or changes. The filename labels it MOD_E2, indicating a modified variant, but it does not explain the modification.