THROTTLE BODY CONSTRUCTION/OPERATION


BHE011313640T02

Construction

• The throttle body construction is as shown in the figure.

1
Actuator
2
Actuator gear
3
Middle gear
4
Valve gear
5
Throttle position sensor
6
Spring
7
Throttle valve
8
Throttle body

Operation

• The actuator is driven by a duty signal from the PCM. This driving force is transmitted to the actuator gear, middle gear, and valve gear, and the throttle valve opens.

• Conversely, to close the throttle valve, the actuator is reversed by an opposite signal from the PCM, and the throttle valve closes.

• The throttle valve opening angle is input to the PCM by the TP sensor.

• The throttle valve body has a control spring. If a malfunction occurs and the actuator cannot be controlled, the throttle valve is maintained balanced at an opening angle of 5° by the spring. Due to this, the required amount of air for vehicle operation is ensured.