Toyota Firmware 89663-37B13
A catalog reference for Toyota calibration 89663-37B13 and its 89663 firmware part-number family.
89663-37B13 is a Toyota calibration identifier in the 89663 part-number family, which is associated with engine control software. The exact vehicle application and function of this calibration cannot be determined reliably from the identifier alone.
Engine control software generally manages functions such as fuel delivery and ignition in response to operating conditions. That general role does not establish what 89663-37B13 changes or whether it represents a stock or modified variant.