1. Gearbox program setting problem.

2. The inside of the gearbox is dirty and impurity. The internal dirt or impurities make it impossible to effectively adjust the oil pressure of the gearbox, resulting in 

frustration.

3. The heat dissipation problem of the gearbox. The poor heat dissipation of the gearbox will cause the gearbox to be abnormally high temperature, which will affect

 the performance of the gearbox oil. If the temperature exceeds 120 ° C, the rubber sealing material of the gearbox will harden, causing the gearbox to leak, thus Affect

 oil pressure, causing frustration.

Here's how to fix a gearbox thump:

1. Reprogram the gearbox computer system.

2. Replace the gearbox oil. It takes 2 years or 40,000 kilometers to replace the gearbox oil.

3. Check whether the valve body inside the gearbox is damaged and replace it in time.

The causes of gearbox slippage are as follows:

1. The hydraulic oil level is too low.

2. The oil level of the hydraulic oil is too high, and a large number of air bubbles are generated after being violently stirred by the planetary row during operation.3. Clutch or brake friction plates and brake bands are excessively worn or scorched.4. The oil pump wears too much or the main oil circuit leaks, causing the oil pressure of the oil circuit to be too low.

5. One-way overrunning clutch slipping.

6. The sealing ring of the clutch or brake piston is damaged, resulting in oil leakage.

7. The piston sealing ring of the shock absorber is damaged, resulting in oil leakage.

The following are related introductions;

1. For slippage of the automatic transmission, the hydraulic oil level should be checked first. If the oil level is too low or too high, it should be adjusted to the normal

 value before checking. If the automatic transmission does not slip after the oil level is properly adjusted, the automatic transmission does not need to be serviced.

2. Check the quality of hydraulic oil. If the hydraulic oil is brown-black or has a burning smell, it means that the clutch or brake friction plate or the brake has a burning

 smell, and the automatic transmission should be disassembled and repaired.

3. Do a road test to determine whether the automatic transmission is slipping, and check the occurrence and degree of slipping gears. Put the control handles in

 different positions to make the car move. If the engine speed suddenly increases when the automatic transmission reaches a certain gear, but the speed does not 

increase accordingly, the gear will slip. The higher the engine speed, the worse the slippage.

There are many common faults of automatic transmission.

1. Oil leakage: There is oil leakage at the gearbox casing or oil pan. One of the reasons is that the seal is aging and the seal is not good; the other reason is that the 

casing has sand holes due to poor manufacturing process.

2. Gear engine stall: When D or R is engaged, damage to the lock-up solenoid valve or lock-up control valve card may cause the engine to stall.

3. Locked gear: The input and output signals of the gearbox are incorrect or caused by component or circuit failures, and sometimes there are communication problems

 between the gearbox computer and other system computers.

4. There is no response when shifting gears: after shifting to D or R, release the brakes, and the vehicle will not move. This situation is mostly caused by damage to the 

input shaft or reverse clutch, or damage to the D/R brake.

5. The impact and impact of shifting gears during driving is also a common failure phenomenon of automatic transmissions, which may be caused by the valve body

 stuck due to dirty transmission oil.

6. The gearbox slips and the acceleration is weak. When the car is running, the engine runs idly when the fuel valve accelerates, the speed does not increase but 

decreases, and the vehicle feels powerless. This phenomenon is mostly caused by the burning of the clutch plate.

7. Water entering the transmission The water entering the transmission is caused by external reasons, which leads to abnormal operation of the transmission. This could

 be due to oil or water in the tank entering from the transmission vent cover.

8. Abnormal noise: When the vehicle is running, there is abnormal noise at the position of the gearbox, which is mostly caused by worn parts or improper installation of 

the gearbox. These eight items are common faults and fault analysis of automatic transmissions.

The car cannot drive

Regardless of whether the shift lever is in reverse gear, forward gear or forward low, the car cannot run; the car can run for a short distance after it is started, but it 

cannot run as soon as it heats up.

Troubleshooting: ①. The oil pan of the automatic transmission is damaged, and all the oil of the automatic transmission leaks; ②. The connecting rod or zipper between

 the shift control handle and the rocker arm of the manual valve is loose, and the manual valve remains in neutral or parking gear position; ③, the oil pump inlet filter is

 clogged; ④, the main oil circuit is seriously leaked; ⑤, the oil pump is damaged.

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