Toyota 89663-04B13 Tacoma Engine Control Calibration

89663-04B13, listed in Toyota service records as calibration ID 8966304B1300, is an engine control calibration associated with the Toyota Tacoma and its 2GR-FKS V6 engine. It forms part of the software used by the engine control module, or ECM, to manage engine operation and monitor faults.

The ECM coordinates functions such as fuel delivery, ignition timing and electronic throttle control. These controls affect how the engine responds to the accelerator and operates under changing loads. The module also monitors its own systems and can illuminate the malfunction indicator light, commonly called the check engine light, when it detects a problem.

Electronic throttle fault and P211904

Toyota service bulletin T-SB-0043-20 lists 8966304B1300 as an updated calibration in a bulletin covering 2016–2020 Tacoma models with the 2GR-FKS engine. The bulletin addresses a malfunction indicator light with diagnostic trouble code P211904, associated with an electronic throttle actuator control fault.

In practical terms, the electronic throttle system uses an electrically operated throttle valve to regulate incoming air rather than relying on a direct cable connection to the accelerator pedal. A fault in its control circuit can trigger the check engine light and affect throttle operation. The bulletin identifies this calibration as an update for the covered condition, not as proof that every Tacoma with this calibration has experienced the fault.

Engine control monitoring and P261093

Toyota also lists 8966304B1300 as an updated calibration in T-SB-0013-19 and T-TCI-5191, which address a malfunction indicator light with code P261093. That code concerns the ECM’s internal engine-off timer performance. The timer helps the controller track elapsed time after the engine is shut down, information used by onboard monitoring routines.

Those bulletins cover several Toyota vehicles, including Prius, Sienna and Camry models as well as Tacoma models in T-SB-0013-19. The broader vehicle lists describe bulletin scope, not fitment of this specific calibration to every listed model. Toyota also lists the ID as an updated calibration in T-SB-0125-18, covering 2016–2017 Tacoma models.

The calibration identifier is useful when comparing a vehicle’s ECM software with a service bulletin. The bulletin’s vehicle, engine and calibration applicability determine whether its documented update is relevant to a particular truck.