The Toyota Sienna Throttle Cable provides a direct path between the driver's right foot and the throttle plate to enable quick and predictable responses from the engine. Comprised of braided steel strands, this Throttle Cable runs from the accelerator pedal to the shaft, which holds the throttle body's butterfly valve in place. Pressing the pedal pulls the plate open to bring in more air. The powertrain computer receives signals from the sensors that give a command to complement the additional airflow with extra fuel. This process allows the vehicle to start easily, pull strong, and pollute less. The early Toyota Sienna vans worked only on a basic layout that was cheap and easy to service. From the 2000s, many models came out with electronic throttle control. In these, the system was redesigned to replace the Throttle Cable with pedal position sensors and a small electric motor. This reduces the risk of sticking and allows stability programs to fine-tune power. Toyota drivers who appreciate a tactile experience will benefit from the intuitive and linear connection. If your Sienna is still using a Throttle Cable, it may be worn or frayed, which can make your Sienna respond slowly or become bound up. Either of these symptoms is a good sign it's time to replace the Throttle Cable. A new Throttle Cable provides instant pedal feel without software calibration, unlike the electronically controlled throttle body.
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