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14.2.3 Throttle valve
14.2.3.1 Working principles of throttle valve
Throttle valve is mainly composed of main cast body, return
spring, accelerator cable, throttle valve position sensor and
idle speed control screw. Throttle valve position sensor
sends the accelerator opening to the ECU, idle speed
control screw can control idle rotational speed and its
stability, specifically reducing the speed by decreasing the
air volume of bypass channel in clockwise direction and
increasing the speed by increasing the air volume of bypass
channel in counterclockwise direction. The screw is
generally screwed in about 2 turns.
14.2.3.2 Throttle valve appearance
14.2.3.3 Throttle valve cleaning method
Throttle valve is cleaned by throttle valve cleaning agent. Specifically, spray the agent to inner valve wall,
gently brush off the dust, and prevent against dirty matters blocking the bypass channel.
14.2.4 Temperature sensor at cylinder end
14.2.4.1 Working principle of temperature
sensor at cylinder end
Temperature sensor at cylinder end serves at air cooled
engine, and it used to measure the temperature of engine
cylinder end. Within the range of sensor temperature, the
resistance will change along with engine temperature, and its
character is the negative temperature coefficient resistance.
It is an non-repairable part.
14.2.4.1 Appearance of temperature sensor at cylinder end
14.2.5 Intake air temperature and pressure sensors
Throttle Valve
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