How to install the light throttle position sensor of Wuling correctly?
(1) Loosen the two fixing screws of the throttle position sensor.
(2) Insert a thickness gauge with a thickness of 0.35 mm between the throttle limit screw and the limit lever, and measure the conduction of the idle switch with a multimeter.
(3) Turn the throttle position sensor counterclockwise, disconnect the contact of the idle switch, and then slowly turn the throttle position sensor clockwise until the idle switch is closed.
(4) Tighten the two fixing screws of the throttle position sensor.
(5) Insert thickness gauges of 0, 30mm and 0.40mm between the throttle limit screw and the limit lever respectively, and measure the conduction of the idle switch. When the thickness gauge is 0.30mm, turn on the idle switch; When the thickness gauge is 0.40mm, the idle switch should be turned off. Otherwise, the throttle position sensor should be readjusted.
Improper adjustment of the throttle position sensor will make the idle switch remain closed when the throttle valve is fully closed or the throttle valve has a certain opening, which will affect the idle control function of the engine computer and lead to abnormal idle operation of the engine, such as excessive or low idle speed, unstable idle speed and easy flameout.
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The throttle position sensor is also called throttle opening sensor or throttle switch. Its main function is to detect whether the engine is in idle or load condition, acceleration or deceleration condition. It is essentially a variable resistor and several switches, which are installed on the throttle body. Its shape and internal structure are shown in the following figure.
The rotating shaft of the resistor is connected with the throttle valve, and it has two contacts: a fully open contact and an idle contact. When the throttle valve is in the idle position, the idle contact is closed and the idle working condition signal is output to the computer; When the throttle valve is in other positions, the idle contact is opened, and voltage signals with different angles relative to the throttle valve are output, and the computer identifies the engine load according to the signal voltage value; According to the change rate of signal voltage in a certain period of time, whether it is an acceleration state or a deceleration state is identified. According to these working conditions, the computer corrects the fuel injection quantity or controls the fuel cut-off.