What is the fault diagnosis skill of throttle valve?

Today, Bian Xiao brings you several methods to judge the throttle fault.

1. If a car is already starting, but I step on the accelerator and step on it to the bottom, its speed will never go up, and I find that the signal of the accelerator position sensor is too small. Many people will find this situation and look for the supplier to see if they can change the throttle at the first time, and then try again. However, the current suppliers will not return it when they use it in the car, and they need to buy it once they try it out. The throttle position sensor is used to monitor the duplicated position in the throttle. There are two groups of position sensors on the throttle, which monitor each other. If there is something wrong with one set of sensors, the computer will limit the power of the engine. Only cars can drive, but the speed can't go up.

2. We should look at the data flow first. Under normal circumstances, sensor 1 and sensor 2 add up to five volts, and we will find that the angle of the throttle is rising, and the data flow of sensor 1 is also rising, but the data flow of sensor 2 has not changed. At this time, it is important to check the throttle or throttle circuit. We can find the signal line of S2 through the circuit diagram, and the voltage we are measuring now is zero volts. This may indicate an open circuit between the plug and this line. At this time, we need to unplug the plug and measure some pins of the plug to see if it is loose. We can use this probe to find this line first. If this thread is loose, we can measure it. Then we adjust the pin. The voltage of sensor 2 is 4.2 volts, and then the data is 83%. Let's look at the sensor. The sensor is 0.8.

3. In fact, the throttle diagnosis is so difficult that we can basically lock the problem, including whether the line is shaking, by reading the reserved long line voltage.