Toyota Firmware 89663-42A31: Calibration Catalog Reference
A concise reference to Toyota firmware identifier 89663-42A31 and its possible engine-control calibration family.
89663-42A31 is a Toyota calibration identifier in the 89663 part-number family, which is commonly associated with engine control module software. The association with engine control is tentative for this exact identifier because its vehicle application and calibration function are not established here.
What the controller family does
An engine control module manages functions such as fuel delivery, ignition timing and emissions control using sensor data and programmed calibrations. Those are general controller duties, not confirmed changes made by 89663-42A31.
The complete identifier matters when distinguishing one calibration from another. A similar 89663 number alone does not establish that the software has the same application, behavior or compatibility.