The throttle is broken, how to detect it.

The main reason of throttle failure is the damage of idle motor, the core component of throttle. The function of idle motor is to receive the output signal of ECU, and constantly change the idle position signal according to various idle working conditions, so that ECU can automatically correct idle fuel supply and ensure the engine idle stability. Once the idle motor signal is interrupted or the motor is damaged, the throttle of the throttle body enters the mechanical emergency state through the emergency spring. The current maintenance method is to replace the throttle. In fact, the best way to maintain the throttle is to replace the throttle motor. The throttle is broken, so a new motor can work normally. This not only saves resources, but also reduces expenses. Taking the accelerator of Volkswagen as an example, this paper introduces how to replace the idle motor.

From the appearance, it seems that you can't take it out without destroying the motor. Actually, it's not. We can easily find a breakthrough. Prepare some corresponding tools, remove the bolts of the back cover, take out the back cover, remove the two bolts of the throttle terminal, pull the terminal out a little and erect it a little. Careful observation shows that there is a small hole next to the terminal, which is actually the positioning shaft hole of the transition gear shaft between the throttle idle motor and the throttle idle potentiometer. What we have to do now is to use this small hole to punch out the gear shaft so as to take out the gear. Find a screwdriver with higher hardness, grind it to the corresponding size, and punch out the gear shaft so that the intermediate gear can be removed. The next step is to take out the circuit board covering the motor, but half of it is blocked by the gear of the throttle idle potentiometer and cannot be completely taken out. Only cut it off at the position shown in the figure, and then gently pry the circuit board with a small screwdriver along the edge gap above the idling motor. Put the circuit board aside. Remove the positioning plate screw on the motor and take out the positioning plate, and the motor can be taken out. Do some cleaning, prepare a new motor and reassemble it in the reverse order of disassembly. At this point, our process is all over.

According to the above example, it is not difficult to replace the throttle motor. However, in the whole operation process, we should be careful and not be too hasty, because the throttle is a relatively precise component, the throttle position sensor and the idle position sensor can not be hit by any external force, and the carbon film resistance inside the throttle can not be scratched a little. The most important thing is that you can't reverse the polarity of the motor, otherwise all previous efforts will be in vain.