Toyota 89663-0C601 Firmware for the 5.7L 3UR-FE

Toyota 89663-0C601 is an engine-control firmware identifier associated with the 5.7-liter 3UR-FE V8. The catalog names place it in main-flash files for engine controllers, including a Tundra entry. The engine control module uses its software and calibration to manage functions such as fuel delivery, ignition timing and emissions controls as the engine operates.

What the catalog identifies

Two main-flash filenames pair 89663-0C601 with different controller part numbers. One describes a 2007 3UR 5.7L 4WD application with controller 89661-0C861. The other describes a 2009 3UR 5.7L 2WD application with controller 89661-0CF80. Both identify a 992 KB main flash and include the controller-family marker 76F0070.

Another filename combines 89663-0C601_USK5###_3URFE_0C861_ME2Fi9. Its 3UR-FE, 0C861 and USK5 identifiers provide further context for the engine and controller association. These filename descriptions are catalog data, not a complete vehicle fitment list or proof that every listed file is interchangeable.

Modified file labels

The most descriptive modified entry is named Tundra 5.7 3URFE 89663-0C601_ST1_E2_SAP OFF REMOVE CONNECTORS SV 5000 p. It identifies a Tundra 5.7 3UR-FE file and labels it ST1, E2 and SAP OFF. The name also includes “REMOVE CONNECTORS” and “SV 5000 p.” without explaining those terms.

SAP refers to the secondary air injection system, which introduces air into the exhaust during certain cold-start conditions to help reduce emissions. A file labelled SAP OFF indicates a modification associated with disabling that system. The filename alone does not establish exactly how the software is changed or what diagnostic checks remain active.

The separate 89663-0C601-_MOD_E2.bin and 89663-0C601-TUN_E2.bin entries carry modified or tuning-style labels, but their names do not specify SAP OFF or describe their changes. The catalog also does not identify the exact changes introduced by the 89663-0C601 calibration itself.