Lexus GX470 89663-60490_ST1_E2_EVAP OFF SV2 5000 Firmware
Learn what the Lexus GX470 2UZ-FE 89663-60490 firmware variant controls and what its modification labels indicate.
89663-60490_ST1_E2_EVAP OFF SV2 5000 is a modified engine-control firmware catalog entry associated with the Lexus GX470 and its 2UZ-FE V8 engine. The 89663-60490 calibration belongs to the engine control module software family. The module manages engine operation, including fuel delivery, ignition timing and emissions-related diagnostics.
What the variant labels mean
The EVAP OFF label indicates a modification intended to disable evaporative emissions system monitoring or related diagnostic faults. The EVAP system normally contains fuel vapors and routes them to the engine to be burned. Disabling its monitoring can prevent the check-engine light from reporting some EVAP faults, but it does not necessarily remove a leak or repair a failed component.
The ST1 label commonly denotes a Stage 1 tuning variant, while E2 is typically used to describe an emissions-related diagnostic modification. The exact calibration changes behind those labels are not established by the catalog name. Likewise, SV2 5000 identifies this particular variant, but the filename alone does not establish what setting or behavior it changes.
Calibration and diagnostic context
The related catalog entry 89663-60490 identifies the base calibration without the modification labels. It should not be assumed to include the changes named in the longer filename. The modified variant may behave differently from a standard calibration, particularly when diagnosing evaporative emissions faults.
Changes to emissions monitoring can affect inspection readiness and road-use compliance. A matching catalog identifier also does not, by itself, establish compatibility with every GX470.