Toyota 89663-0C600 Firmware for Tundra 5.7 3UR-FE

Toyota 89663-0C600 is associated in the catalog with the Tundra 5.7-liter 3UR-FE engine and its engine control calibration. The most specifically named variant is labeled SAP OFF, indicating a modification intended to disable secondary air injection operation.

Engine control and secondary air injection

The engine control module uses calibration software to manage functions such as fuel delivery, ignition timing and emissions controls. One of those emissions systems, secondary air injection, supplies fresh air to the exhaust during a cold start to help reduce emissions while the catalytic converters warm up.

The catalog name Tundra 5.7 3URFE 89663-0C600_ST1_E2_SAP OFF REMOVE CONNECTORS SV 5000 p. combines the calibration ID with several modification labels. SAP OFF describes the intended secondary air injection change, while REMOVE CONNECTORS is an accompanying catalog note. The name also includes ST1, E2 and SV 5000 p., but it does not define their precise effects. It should not be treated as a complete description of the modified calibration.

Other catalog variants

The related filenames 89663-0C600-A_MOD_E2.bin and 89663-0C600-A_MOD.bin identify modified files in the same calibration family. The first carries an E2 label and the second does not. Neither filename explicitly names SAP OFF, so that feature should not be assumed for either file.

The entry 89663-0C600-A appears without a modification label. Its name alone does not establish whether it is a stock calibration or describe a particular software revision. The catalog association identifies the Tundra 5.7 3UR-FE application, but does not establish every compatible model year or vehicle configuration.