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°). However, during idling the valve is closed more than this fixed position.When the engine ECU detects a malfunction, it turns ON the malfunction indicator lamp in the combination meter while cutting off the power to the motor, but because the throttle valve is kept open to approx. 7°, the vehicle can still be driven to a safe location.The initial model with the ETCS-i used a magnetic clutch between the motor and the throttle valve, which could be used to connect to and disconnect from the motor. The ETCS-i controls the throttle valve opening angle to the optimum amount in accordance with the amount which the accelerator pedal is depressed.1.Normal-mode control, Power-mode control and Snow-mode controlBasically, the normal-mode is used, but the control switch can be used to switch to the snow-mode or power-mode.Normal-mode controlThis is the basic control that maintains a balance of easy operation and smooth driving.Snow-mode controlThis control keeps the throttle valve opening smaller than when in the normal-mode to prevent slipping when driving on a slippery road, such as a snowy road.Power-mode controlIn this mode the throttle valve is open much wider than in the normal-mode. Therefore, this provides a more direct response against the accelerator pedal operation and more powerful driving than the normal-mode. This mode is only provided in some models.
The ETCS-i controls the throttle valve opening angle to the optimum amount in accordance with the amount which the accelerator pedal is depressed.
Normal-mode control, Power-mode control and Snow-mode control
Basically, the normal-mode is used, but the control switch can be used to switch to the snow-mode or power-mode.
Normal-mode control
This is the basic control that maintains a balance of easy operation and smooth driving.
Snow-mode control
This control keeps the throttle valve opening smaller than when in the normal-mode to prevent slipping when driving on a slippery road, such as a snowy road.
Power-mode control
In this mode the throttle valve is open much wider than in the normal-mode. Therefore, this provides a more direct response against the accelerator pedal operation and more powerful driving than the normal-mode. This mode is only provided in some models.
This is the best Control of Throttle valve From Toyota, and out of Toyota we know is called Drive by wire
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