Lexus LX 570 Firmware 89663-60C44: 3UR-FE Engine Control

89663-60C44 is an engine-control calibration cataloged for the Lexus LX 570 with the 5.7-liter 3UR-FE V8. Its related files identify the URJ2# vehicle family and include both an unqualified calibration file and a modified variant labeled for EVAP and secondary air pump changes.

The engine control module uses calibration data to manage engine operation, including fuel delivery, ignition timing and emissions-related functions. These controls influence how the engine responds to driving conditions and how the vehicle monitors emissions systems. The catalog names identify the application and variant, but do not describe the changes made by this particular calibration revision.

Standard and modified catalog files

The file LX570 URJ2# 3URFE 89663-60C44.bin identifies the LX 570, URJ2# family, 3UR-FE engine and calibration number. It has no modification label in its filename.

The separate file LX5705.7 3URFE 89663-60C44_E2_EVAP_SAP OFF_CS OK.bin carries the labels EVAP SAP OFF and CS OK. The EVAP label refers to the evaporative emissions system, which controls fuel vapors from the tank. SAP refers to the secondary air pump system, which supplies air to the exhaust during certain operating conditions to help reduce cold-start emissions. The off label indicates a modified variant associated with those systems, but the filename alone does not establish precisely which controls or diagnostic checks were changed.

CS OK is a checksum-status label in the modified filename. It does not establish vehicle compatibility or emissions compliance. The additional E2 label is present in that filename, although its specific meaning is not established by the catalog name.