SW#89663-60C31- MOD_E2_sapoff.bin: Toyota ECU Calibration
An overview of Toyota calibration 89663-60C31 and the modified SAP-off firmware variant.
SW#89663-60C31- MOD_E2_sapoff.bin is a modified firmware file associated with Toyota calibration 89663-60C31. Its sapoff label indicates a modification intended to disable the secondary air injection system. The exact vehicle and controller application are not established by the catalog identifier alone.
What the SAP-off label means
On vehicles equipped with secondary air injection, the engine control system operates an air pump and valves to introduce fresh air into the exhaust after a cold start. This helps the catalytic converters reach effective operating temperature sooner and reduces emissions during warm-up.
A file labeled sapoff generally indicates a calibration modified to prevent secondary air injection operation or related fault monitoring. The filename alone does not establish which controls or diagnostic checks were changed. Disabling this emissions function can affect fault reporting and emissions compliance.
Calibration and variant
The 89663 part-number family is associated with Toyota engine control software. The related catalog entry 89663-60C31 identifies the base calibration, while MOD_E2_sapoff.bin identifies the modified variant. The meaning of E2 is not clear from the filename, and the catalog does not establish what changes distinguish this revision from other calibrations.
When investigating an air injection fault, the practical distinction is important: a modified calibration may alter how the controller responds to the system, but it does not establish the condition of the pump, valves, wiring or other components.