Toyota 89663-35650_TUN_E2_SAPoff Firmware
A catalog overview of Toyota calibration 89663-35650 and its tuned secondary air injection system off variant.
89663-35650_TUN_E2_SAPoff.rar is a modified Toyota engine-control firmware archive labeled for secondary air injection system deactivation. The SAPoff label indicates that the variant is intended to alter the engine control module’s handling of the secondary air pump system.
What the SAPoff label means
Secondary air injection supplies fresh air to the exhaust during certain cold starts. This helps the catalytic converter warm up and reduces emissions while the engine and exhaust are cold. An SAP-off calibration is intended to change the software behavior associated with that system. The filename alone does not establish exactly which controls or diagnostic checks were changed.
The TUN label identifies this as a tuned variant rather than a stock-labeled file. E2 is an additional variant marker, but its precise meaning is not established by the catalog name. The related entry 89663-35650 identifies the underlying calibration without the modified file’s SAP-off label.
The 89663 part-number family is associated with Toyota engine-control calibrations. The complete identifier and available catalog name do not establish an exact vehicle application or compatibility. Altering emissions-control software can also affect emissions compliance and inspection results.