Toyota 89663-04B14 Firmware: Tacoma Throttle Control

Toyota 89663-04B14 is an updated engine control calibration associated with the electronic throttle system on Tacoma models equipped with the 2GR-FKS engine. Toyota service records list its full calibration identifier as 8966304B1400 in bulletins addressing an illuminated malfunction indicator light and diagnostic trouble code P211904.

What the calibration controls

The engine control module manages engine operation using programmed calibrations and sensor inputs. One of its jobs is to control the electronically operated throttle valve, which regulates the air entering the engine. The module commands the valve and monitors its response so it can detect a problem with throttle control.

Code P211904 identifies a throttle actuator control throttle body range or performance problem with an internal system failure designation. In practical terms, the warning light tells the driver that the engine management system has detected a condition requiring diagnosis. The code identifies the system involved, but it does not by itself establish whether the cause is software, the throttle body or another part of the control system.

Updated calibration in Toyota service bulletins

Toyota Service Bulletin T-SB-0043-20 lists 8966304B1400 as an updated calibration in connection with the warning light and P211904. The bulletin covers 2016 through 2020 Tacoma models with the 2GR-FKS engine. That model-year range describes the bulletin’s scope, not proof that this exact calibration applies to every vehicle covered.

Toyota TIS record T-TCI-5349 also identifies the calibration as updated for a 2016 Tacoma with the 2GR-FKS engine and the same diagnostic code. These records establish the calibration’s connection to the documented throttle-control concern. They do not describe every software change in the revision or identify it as a performance modification.