Drive-by-wire systems allow the ECU to control the throttle electronically rather than through a traditional cable. This category includes electronic throttle bodies, DBW modules and related components required to run an ECU-controlled throttle system.
The problem they solve is limited throttle control. Cable-operated throttles cannot provide the same level of precision or integration as electronic systems, particularly when advanced tuning strategies are being used.
With drive-by-wire, the ECU can control throttle input based on multiple factors including driver input, engine load and traction conditions. This improves drivability and allows the use of features such as traction control, launch control and torque management.
Drive-by-wire systems are commonly used in modern performance builds where greater control and integration with the engine management system is required.