Toyota Firmware 89663-52N31: Stage 1 and E2 Calibration Files
A catalog overview of Toyota firmware 89663-52N31 and its AVT Stage 1 and Stage 1 E2 file variants.
89663-52N31 is a Toyota calibration identifier in the 89663 part-number family, which is associated with engine control software. The engine control module uses calibration data to manage functions such as fuel delivery, ignition timing and emissions control. The exact vehicle application and the changes made by this calibration are not established by the catalog filenames alone.
AVT Stage 1 and E2 variants
The catalog lists two files: 89663-52N31-_AVT_Stage1.bin and 89663-52N31-_AVT_Stage1_E2.bin. Both carry the AVT and Stage 1 labels, which indicate modified calibration variants rather than identifying either file as stock. The filenames do not specify the performance changes or tuning targets.
The 89663-52N31-_AVT_Stage1_E2.bin filename also carries an E2 label. Its precise meaning is not defined in the catalog, so it should not be assumed to describe a particular emissions or diagnostic change. That label applies only to the file that names it.