Toyota Prado 150 2.8 Firmware 89661-60E50 / 89663-60Z31 EGR OFF
Explore the Toyota Prado 150 2.8 1GD-FTV engine ECU firmware identifiers and the meaning of the EGR OFF FULL and CRC OK labels.
The catalog entry WinOLS Toyota Prado 150 2,8_1GDFTV_89661-60E50_89663-60Z31_EGR OFF FULL_CRC OK describes a modified engine ECU file for a Toyota Land Cruiser Prado 150 with the 2.8-liter 1GD-FTV diesel engine. Its named modification concerns exhaust gas recirculation, or EGR, rather than a separate body or transmission control module.
What the engine ECU controls
The engine ECU manages diesel engine operation using sensor information and calibration data. Its functions include fuel injection, air management and emissions controls. Part number 89661-60E50 identifies the engine-control computer family, while 89663-60Z31 is the associated engine ECU software or calibration identifier in this catalog entry.
The complete vehicle, engine and identifier combination matters: a similar-looking Toyota part number alone does not establish that a file belongs to the same engine or application.
What EGR OFF FULL means
In normal operation, the EGR system directs a controlled portion of exhaust gas back into the intake. This reduces combustion temperatures and helps limit nitrogen oxide emissions. The ECU commands EGR operation according to engine conditions, so the system forms part of the vehicle's emissions strategy.
EGR OFF FULL labels this file as an EGR-disabled modification. In practice, the intended behavior is to prevent normal EGR operation through changes to the engine calibration. The filename does not establish the exact changes made to EGR commands, diagnostics or related control maps. It also does not describe a stock calibration.
WinOLS and CRC OK
WinOLS is calibration-editing software commonly used to examine and modify ECU files. The CRC OK label indicates that the file is presented as having a valid or corrected checksum. It is not, by itself, proof of compatibility with every Prado 150 or of the quality of the EGR modification.
Because EGR is an emissions-control function, disabling it can affect emissions compliance and may be prohibited for road use. For diagnosis, the modified file should be distinguished from the original ECU software when assessing EGR behavior or emissions-related faults.