Throttle body construction and operation


the throttle body consists of a throttle valve, throttle position sensor that detects the throttle valve opening, throttle control motor that opens and closes the throttle valve, and a return spring that returns the throttle valve to a fixed position. The throttle motor employs a DC motor that has good responsiveness and consumes little power. The engine ECU controls the amount and direction of the current flowing to the throttle control motor, turns or holds the motor, and opens and closes the throttle valve via the reduction gear. The actual throttle valve opening is detected by the throttle position sensor, and this is fed back to the engine ECU. When current is not flowing to the motor, the return spring opens the valve to a fixed position (approx. 7

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