Toyota and Lexus Firmware 89665-30L31
A catalog reference for Toyota and Lexus firmware identifier 89665-30L31 and its likely engine-control module family.
89665-30L31 is a Toyota or Lexus calibration identifier in the 89665 part-number family, which is commonly associated with engine control module software. That family association is tentative for this specific entry because the available identifier alone does not establish its exact application or calibration function.
What the controller family does
An engine control module manages engine operation using sensor inputs to determine commands such as fuel delivery and ignition timing. Depending on the vehicle, it may also coordinate with other controllers to manage engine torque and emissions.
Those are general controller functions, not documented changes for calibration 89665-30L31. The identifier does not by itself establish a particular vehicle, service-bulletin condition or modified software feature.