1. Abnormal sound
The abnormal noise of the bearing, the abnormal noise of the general bearing is closely related to the rotational speed, and the higher the rotational speed, the more screaming.
The differential or the main drive gear is abnormally sounded. This kind of abnormal noise generally appears at a speed of 50-70 kilometers. Because the gears have different meshing surfaces, the sound is generally loud when refueling, and the sound of releasing the throttle is obviously weakened.
The hydraulic system such as the oil pump has abnormal noise. This kind of sound is closely related to the speed of rotation, but it has nothing to do with the speed of the vehicle. When the speed is high, the oil pump is blocked and the scream is caused. It should be noted that the gearbox system works in conjunction with the engine and chassis, and many sounds are mixed together. Identification is not an easy task.
2. Odor in the box
The gearbox body is operated by hydraulic oil. When the oil temperature is too high, some combustion will occur, and these odors will be transmitted, which indicates that some actuators in the gearbox are not working properly.
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3. Automatic shift time is too long or too short
Generally, the automatic transmission has a specific shifting speed and speed. If the shifting time is suddenly too long or too short, it means that the transmission ratio of the transmission is disproportionate, and the engine speed is too high. What’s more, the gearbox does not shift gears, which means that the gearbox has a problem.
4. High engine speed during driving
This problem includes two situations: high speed during steady running and speed during speed increase: high speed during smooth running, it is easier to test, for example, a vehicle with a displacement of 2.0 is usually at 2600 rpm and the speed can reach 100 km. The time often needs 3000 rpm or more to reach 100 km, which indicates the fault. Generally, the fault is caused by the failure of the transmission high-speed gear or the failure of the internal lock-up clutch of the changer, and the gearbox needs to be repaired immediately. During the speed increase process, the speed is too high. This fault test is a bit complicated, because during the speed increase process, the engine speed rise is closely related to the accelerator pedal. For example, a normal Passat is in the case of a small throttle. The vehicle can be accelerated by 2,500 rpm, but in the case of full throttle, the engine will be upgraded to 5,500-6,000 rpm. Such a large contrast is controlled by the fuzzy logic of the electronic control system of the gearbox, so this standard requires a certain professional. Level can be completed.
5. Engine idling
Engine idling generally occurs in two situations. One is that the engine suddenly idling in the stationary plant, and the vehicle speed returns to normal after slowing down. This situation generally indicates that the gearbox suddenly drops from the high position to the short time in a short time. In the low gear position, the problem may be in the control system or the heat dissipation system, and the gearbox itself has no problem. The second is that during the acceleration process or during the shifting process, there is a short slip and idling phenomenon. The intuitive feeling is that the latter is not as powerful as the former. In fact, the opposite is true. The latter problem is mostly in the gearbox. In the relevant links such as the clutch, the gearbox is completely dismantled and overhauled, and the time cost is much higher than the former.
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