Toyota 89663-28392 Firmware Catalog Reference
A concise reference to Toyota firmware identifier 89663-28392 and its control-module family.
89663-28392 is a Toyota calibration identifier in the 89663 part-number family, which is associated with engine control computer software. The exact application and the behavior of this calibration are not established by the identifier alone.
Engine control software generally governs functions such as fuel delivery, ignition timing and emissions-related operation using sensor inputs. Those general functions do not establish what changed in revision 89663-28392 or which vehicle it fits.