Toyota Camry 3.5 2GR-FKS 89661-0X611 89663-06Q31 Stage 2 Firmware
A catalog overview of Toyota Camry 2GR-FKS engine firmware 89661-0X611 and calibration 89663-06Q31, labeled Stage 2, E2 and EVAP Off.
The Toyota Camry 3.5 2GRFKS_89661-0X611_89663-06Q31_STAGE2_E2 FULL_EVAP OFF_CVN OK_CRC OK entry describes a modified engine-control calibration for the 3.5-liter 2GR-FKS V6. Its EVAP OFF label indicates that evaporative-emissions system monitoring has been altered or disabled. In practice, that can prevent the engine computer from reporting some faults involving fuel-vapor containment or purge operation.
Engine controller and calibration
The 89661-0X611 identifier belongs to Toyota’s engine control module part-number family. The related 89663-06Q31 identifier is a calibration identifier associated with the software record. Together with the Camry and 2GR-FKS labels, they distinguish this entry as an engine ECU file rather than firmware for a body, infotainment or other vehicle controller.
The engine ECU controls functions such as fuel delivery, ignition timing, electronic throttle operation and emissions monitoring. The identifiers describe the controller and calibration association, not a guarantee of compatibility with every Camry 3.5.
What the modified labels mean
Stage 2 identifies this as a modified performance-oriented variant rather than a stock calibration. It suggests changes to engine operating maps, but the filename does not establish the exact adjustments, required hardware or resulting power output.
E2 FULL is a modification label commonly associated with emissions-related diagnostic changes. Its exact implementation is not established by the filename. The separate EVAP OFF label is more specific: the EVAP system normally stores fuel vapors and routes them to the engine for combustion, while the ECU monitors relevant components and system integrity. Disabling that monitoring can reduce diagnostic visibility without necessarily removing the physical system.
CVN OK and CRC OK describe the file’s stated calibration verification number and checksum status. They are catalog claims, not independent proof of diagnostic compliance or suitability for a particular vehicle. Emissions-related modifications may also be restricted for road use.