The Lexus ES300 Throttle Cable directly connects the accelerator pedal to the throttle plate, allowing the driver to control the engine airflow with simple pressure applied to the accelerator pedal. Early models of the Lexus ES300 applied this braided metal Throttle Cable assembly, which was very robust, to turn the butterfly valve located inside the throttle body, while position information was sent by sensors relaying information to the Powertrain Control Module to balance fuel injection. Later Lexus ES300 generations applied Electronic Throttle Control, which replaced the mechanical Throttle Cable with motor-driven actuation that incorporates the traction and stability aids; hence, there is no sticking or binding and finer idle regulation using the Idle Air Control passage. Despite the transition to electronics, knowledge of the original Lexus ES300 setup is still useful, as a worn Throttle Cable can be a potential source of sluggish response or uneven idle if it's still fitted in older cars, and a properly adjusted Throttle Cable is a source of crisp pedal feel.
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