Troubleshooting in vehicles with automatic transmission: when you turn on the gear, it jerks the car

Every year the number of cars with automatic transmission is constantly growing. Especially this trend is observed in large cities. Why choose the automatic transmission? Reviews of car owners talk about usability. Today we will look at the problems with this box and why it is so popular.

Advantage of the machine over the mechanics

Despite the fact that the automatic box is much more expensive, complex in design and contains many units and mechanisms, it has a number of advantages over the mechanical transmission. The main feature of the machine is the possibility of working without needing to squeeze the clutch and manually switch the lowered or increased gear. As a result, comfort is achieved while driving, the driver is less distracted and better keeps track of the road. Also the automatic machine provides smooth change of transfers, the moment of switching which for the driver is practically invisible. There are also disadvantages. AKPP much longer disperses the car. But the developers managed to fix it, adding the function of manual increase or decrease of the transfer force. But not everything is so smooth. Over time, the management of such a car becomes different - the automatic transmission turns on the car when turning on the gear. There are many reasons for this phenomenon.

What are the symptoms?

Not always this malfunction is accompanied by a simple twitching. There is a knock on the gears, vibrations and excessive noise. All this points to problems in the gearshift mechanism. Below we will consider why this happens.

Problems with the inclusion of "Drive"

If the car starts to twitch when switching from "Parking" to "Drive", the cause of this phenomenon is the wear of the parts of the water plate. If there are jolts when switching from an increased transmission of the automatic transmission to a lower one, you need to diagnose the brake band and clutches. Separately it is necessary to talk about solenoids.

Solenoids

This is a tap-regulator electromechanical type. Its main purpose is the perception of electric pulses from the computer and the control of the channels of the hydroplate. At the command of the control unit, the solenoids open or close them. Such elements are used both on automatic and robotic boxes. Thanks to them, the oil flow in the system is monitored. Solenoids are located in the valve hydraulic plate and installed in the channel of the hydraulic unit with a pressure plate. The main problems with it concern the electrical part. The element is connected via the electrical connector to the transmission ECU. On many transmissions, this connector is damaged, which causes the automatic transmission to jerk the car when it is turned on. With computer diagnostics, a communication error with the solenoid is displayed on the screen. This problem is solved only when the automatic box is completely removed. Also note that the resource of solenoids is 100 thousand kilometers. If there is a knock at the gear change, pay attention to when their last replacement was made.

Twitches when overclocked

One of the frequent problems that bothers car owners is the jerks in the gear shift. When speed dials, the machine starts to twitch. In this case, check the oil level. If it is at the minimum mark, resume it to medium or maximum. The pump may not be able to produce the correct oil pressure. If the automatic transmission is pulling the machine when turning on the gear, also check the lockout of the "bagel" (torque converter).

Jolts in winter

Such symptoms are not necessarily a symptom of malfunctions. In most cases, the automatic transmission when you turn on the gear pulls the car because of unheated oil. When you turn on the engine in winter you need to thoroughly warm up not only the engine, but also the box. Experts recommend to continue driving 3-5 minutes after launch. The oil in the automatic box is a working fluid. It is this that transmits the torque from the engine to the wheels. As the temperature decreases, the oil changes its viscosity. To return it to the normal value, move the gear selector several times to P, R, N, D and back. When the oil warms up to operating temperatures, the control of the automatic transmission will be pleasant - the transmissions will not jerk during acceleration.

Vibration in the back stroke

If during acceleration the transmission switches the speed normally, but when the selector is switched to the "Reverse" mode, the gearshift vibrates, there are several reasons for this. The first is the malfunction of the control sensors in the box. It's very difficult to solve this problem with your own hands. Repair of automatic gearboxes is best entrusted to professionals. With the help of computer equipment, errors will be read and, depending on the fault, the sensors or other elements of the box will be replaced.

Software Problems

The twitching at switching of speeds arises at a problem with the control automatics. This problem is solved by updating the firmware of the electronic automatic transmission control unit. This work is carried out in specialized centers. This operation allows you to optimize the operation of the transmission and save it from jolts and jerking when driving.

About oil change

Most faults are caused by improper operation of the transmission. In half the cases, the repair of automatic gearboxes is made because of an untimely oil change. And if in mechanical transmissions it is flooded for the whole service life, then the automatic schedule is 60 thousand kilometers. If the car drives under load (for example, with a trailer), this period decreases to 40 thousand. Often, when the old oil smelled of fire, this is a very bad sign. The color of the liquid must not be black. Fresh oil has a red tint. Also, as the gear is used in the gearbox mechanism, chips are produced. It is caught by special magnets on a pallet. Often there are several. When replacing the oil, the pallet must be cleaned together with the magnets. The presence of chips in the hydraulic unit is fraught with breakdowns and malfunctions in the form of twitches and vibrations. Driving on a dirty, black oil threatens the rapid deterioration of the hydroplate and other parts of the automatic transmission.

Not only oil

When this time is reached, it is necessary to change not only the working fluid. In the design of the automatic box, unlike the mechanics, has its own oil filter. It is also subject to replacement. The gasket of the oil pan is also changing. It is installed on the red sealant. They miss all the seats.

Conclusion

So, we found out why the automatic transmission turns the car when turning on the gear. Malfunctions can apply to both the mechanical and hydraulic parts. For any symptoms, you should read the errors. After repair, the electronic control unit is reflashed. A complete error reset is performed. Also note that with timely maintenance of the resource of this transmission is comparable with the mechanics. In the winter time, try not to drive on the unheated box. If there is an urgent need, it is allowed to drive on a cold checkpoint, provided that the crankshaft is smoothly tapped and low. The first 1-2 kilometers do not keep them above two thousand.