Toyota Firmware 89663-E2U80-C

89663-E2U80-C is a Toyota firmware catalog identifier in the 89663 calibration part-number family. The catalog lists it both as an identifier and as the binary filename 89663-E2U80-C.bin.

The 89663 family is associated with engine control software, so an engine control module application is plausible. The complete identifier and catalog names do not establish the exact vehicle, engine, or control function for this entry. The -C suffix is part of the listed identifier, but the names do not describe it as a stock or modified variant.