Toyota Tundra 89663-0C791 Firmware: 2UZ-FE SAP-Off Calibration
Explore Toyota Tundra 89663-0C791 firmware for the 4.7-liter 2UZ-FE and the cataloged SAP-off variant.
Toyota firmware 89663-0C791 is cataloged for the Tundra 4.7-liter 2UZ-FE engine. The 89663 part-number family identifies engine-control calibration software, and the listed file is a modified variant labeled SAP OFF FULL. That label indicates a calibration intended to disable the secondary air injection system.
What the SAP-off variant changes
Secondary air injection supplies fresh air to the exhaust during cold operation to help the catalytic converters reach effective operating temperature and reduce emissions. The engine control module manages this system alongside fuel delivery, ignition timing and other engine functions. A SAP-off calibration is intended to suppress the system’s operation or monitoring, but the filename alone does not establish exactly which controls and diagnostic checks were changed.
The catalog filename is WinOLS Toyota Tundra 4.7 2UZFE 89663-0C791_E2_SAP OFF FULL_CVN OK_CRC OK_736kb. Its CVN OK and CRC OK labels describe the modified file as having acceptable calibration verification and checksum values. They do not establish emissions compliance or confirm compatibility with a particular vehicle.
The E2 designation and the stated 736kb size are additional identifiers for this cataloged file. They do not, by themselves, describe a stock calibration or establish the changes made from it.