What happens if the accelerator position sensor of the car is broken? If the plug is unplugged, can you stop and run?

The damage of valve position sensor will lead to engine jitter and unstable idle speed. The most obvious symptom is unstable idle speed. When you accelerate rapidly, you will feel that there is not enough power, or you will not be able to accelerate. Because the throttle position sensor is a signal to detect the throttle opening. Unplug the plug and the car will start.

The rotating shaft of the throttle position sensor resistor is connected with the throttle, and it has two contacts: a fully open contact and an idling contact. When the throttle is in the idle position, the idle contact is closed and the idle state 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.

Extended data

A controllable valve that controls air to enter the engine. After the air enters the intake pipe, it will be mixed with gasoline to form a combustible mixture, which will be successfully formed after combustion. It connects the air filter and the engine block, and is called the throat of the automobile engine.

The reason why the crankcase ventilation pipe is connected to the throttle valve is the requirement of environmental protection on the one hand, and the gas is pumped out of the crankcase by using the negative pressure of intake air on the other hand. When the oily steam reaches the intake pipe and cools, the oil in it will condense on the intake and throttle valve, and then the carbon deposit in the steam will also be deposited on these parts. Because the air flow is the largest in the gap where the throttle valve is opened, the space is small and the gas temperature is low, this part is the easiest to condense.

Therefore, how long the throttle will be dirty depends on the quality of the air filter, the brand and quality of the engine oil, the condition of the driving section, the temperature, the working temperature of the engine, driving habits and so on.

Even for individuals, it is impossible to determine the time to clean the throttle with a fixed number of kilometers. The interval between cleaning the throttle for the first time in a new car is the longest. Later, due to the continuous condensation of oil and gas in the crankcase ventilation pipe and intake port, the cleaning frequency will increase, and different weather conditions will also affect the dirty speed of the throttle.