Toyota and Lexus SW#89663-60J90- MOD_E2_sap_off Firmware

SW#89663-60J90- MOD_E2_sap_off is cataloged as a modified Toyota or Lexus engine-control calibration with a secondary air injection off label. Secondary air injection helps reduce emissions after a cold start by supplying fresh air to the exhaust, where it supports catalyst warm-up and oxidation of unburned gases.

What the calibration label means

The related catalog entry 89663-60J90 identifies the base calibration family. The full filename adds MOD_E2_sap_off, indicating a modified variant. In this context, sap_off points to secondary air pump or secondary air injection operation being switched off in the modified software. The label alone does not establish exactly which pump commands, diagnostic checks or fault responses have been changed.

Engine-control software manages fuel and ignition alongside emissions-related functions. On a vehicle equipped with secondary air injection, the system normally operates briefly under suitable cold-start conditions. A variant labeled sap_off is therefore relevant to cold-start emissions behavior, rather than a general description of how the engine runs at all times.

Catalog context

The filename does not identify an exact Toyota or Lexus model, engine or control-unit application. The unmodified 89663-60J90 entry should not be assumed to have the same secondary air injection change as the MOD_E2_sap_off variant. The precise meaning of the additional E2 label is not established by the catalog name.