Throttle body (throttle body) is the engine control system, an important part in driving after a certain mileage, for example, 300,000 km, to throttle body damage on the peak, common symptoms are unstable idle, idle flame or idling too high. In addition to the throttle body is dirty, the throttle body is sometimes an internal fault, the usual repair method is to replace the throttle body as a whole, this would be very high maintenance costs, but also caused some degree of wastage. I found that the vast majority of the throttle body failure by internal damage caused by idling the motor, so the better maintenance of the throttle body is to replace the idle speed motor.

As the throttle body has long been the practice of the disintegration of the maintenance is not much, which led to the idle motor is difficult to buy parts that can not find a suitable replacement motor, but also how to replace the motor has some technical difficulty. With in-depth maintenance technology, supporting the current model and the corresponding idle motor has good purchase.

In this, the author of the avant-garde Jetta 2V engine throttle body to illustrate the idle speed motor replacement method, and other mass models can refer to the following method:

First, the internal structure of the throttle body

Engine control unit to control the throttle body, idle switch, idle throttle potentiometer and throttle potentiometer to the control unit (J220) provides throttle position information within the idle speed control unit controls the idle speed control motor through gear throttle opening.

1, the throttle potentiometer (G69) directly connected to the throttle shaft, the control unit provides full throttle adjustment range position signal. In the car equipped with automatic transmission, the control unit also controls the use of automatic transmission of this signal. If the control unit did not get the throttle potentiometer signal, the control unit with the engine speed and air flow meter signal to calculate an alternative value.

2, idle throttle potentiometer (G88) together with the idle speed motor, notice the location of the throttle control unit and the idle position within the motor idling. When the potentiometer adjustment range to reach the limit, continue to open the throttle, potentiometer no action. If the signal is interrupted, the emergency use of the throttle body springs into the mechanical state of emergency, idle speed increase.

3, the idle switch (F60) closed in the idle range, the system identifies idle condition. If the signal is interrupted, the control unit more throttle and idle throttle potentiometer potentiometer's value to identify the throttle idle position.

4, the idle speed motor (V60) within the idle control to manipulate the throttle through the gears. If the control unit of the V60 motor control lost or damaged, the emergency spring will pull the throttle position of a particular emergency.

Second, the steps

1 Unscrew the throttle body (throttle body) cover bolts, remove the rear cover, then you can see the internal structure. On the surface, does not seem to undermine the idle throttle potentiometer and idle speed motor drive gear between the motor can not be out. In actual fact, as long as we find it very easy for a breakthrough.

2, remove the fixed throttle body multi-pin socket of 2 bolt, the socket on the cable out a little, then if you look closely you will find outlet has a fixed position next to the hole, this hole is the idle speed motor and idle throttle potentiometer positioned between the drive gear shaft axis of the hole.

3, looking for a higher hardness for iron, polished or screwdriver into the appropriate thickness, the use of positioning shaft hole coming out of the gear shaft, gear can be had to go. Gear for the plastic material, pay attention to red when not to damage the gear gear shaft.

4, will cover the idle motor on the circuit board out, but a very small part idle throttle potentiometer gear blocked and can not get out of the whole, the position of the icon can only be cut off the plastic part of the circuit board, and then small screwdriver along the edge of the gap above the idle speed motor gently pry the circuit board, the circuit board to get open on one side.

5, open the idle position above the motor plate screws, remove the positioning plate, idle speed motor can come out. To do some cleaning work on the new motor installed and re-installed the other components.

6, the throttle body mounted on the engine, the use of basic diagnostic set, test. At this point the end of the maintenance work.