The Throttle Body's function is to manage the air filter and intake the air into the engines of Nissan Versa in relation to the quantity and the rate of throttle command from the accelerator. The throttle body unit lies between the air filter box and the intake manifold and contains a butterfly valve that controls rate of airflow into the engine. In fuel injected engines the throttle body helps to regulating the right air/fuel mixture since it adjusts fuel injection when the throttle plate is opened. Depending on the year and model of the Nissan Versa, it might have Electronic Throttle Control (ETC) or "drive-by-wire", which removes any mechanical problems and combines throttle and safety features. This system contains APP (Accelerator Pedal Position) sensors that inform the PCM of the accelerator position and an electric motor positioned on the throttle body that opens or closes the throttle component based on PCM's signal. Throttle bodies in general are rather sturdy but the shaft of the throttle body do wears out or gets dirty and may require cleaning or replacement ETC motors and TPS sensors are replaceable items.
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