Automatic transmission jerks when shifting to drive
The cause of a jerking automatic transmission can't be sentenced directly like a choice for damage that occurs in a broken car tire on the road or a broken fan belt.
At the very least, it requires careful inspection of many things, such as the automatic transmission oil changes history, how it's the drive, checking the engine and transmission computer data, and so on to the stall test procedure to measure hydraulic pressure in the automatic transmission.
Even so, sometimes the cause of this jerking automatic transmission can also occur due to trivial things, such as improper adjustment of the accelerator of kick down servo.
This article will share information regarding the causes of jerking automatic transmission, which can happen at any time, see the info on the causes of jerking automatic transmission below.
1. Dirty and damaged automatic oil
The most common cause of jerking automatic transmission begins with dirty and damaged automatic oil. Yes, damage occurs not only in moving components; automatic oil can also be dirty and damaged. We should note that the automatic transmission works in a car uses a hydraulic system that relies on the automatic transmission oil to control the car movements.
When the automatic oil is dirty and damaged, the entire working system in this automatic transmission will be greatly affected, one of which can cause the car to feel jerky when the gear lever is shifted or when an automatic gear shift happens when the vehicle is moving.
2. A/T Solenoid problem
The second cause of jerking automatic transmission is the result of a problem with the AT solenoid. AT solenoid is an automatic transmission component that works electrically based on TCM (Transmission Control Module) commands.
The function of the AT solenoid is to regulate the automatic oil flow in the AT valve body to activate the AT motion components such as the Clutch and Brake to the hydraulic dumper clutch connected to the Torque converter.
A faulty AT solenoid will cause the automatic oil flow for the components needed to be disrupted according to their working conditions. The result will cause a jerk on the automatic transmission.
3. Worn-out clutch and brake
The third cause of the jerk automatic transmission is the worn-out clutch and brake components. This automatic transmission's clutch and brake components consist of an arrangement of wet clutch plates that rub against each other when the clutch and brake work.
When the clutch plates in the clutch and brake wear out, it will also disrupt the connection to the clutch plates in the clutch unit. One of the consequences will be the cause of the automatic transmission jerking.
4. A/T Electrical system components have problems
The cause of the next jerky automatic transmission is that there is a problem with the AT electrical system component. Yes, automatic transmissions for today's cars already use a lot of electrical control via a Transmission Control Module (TCM).
In a computerized transmission system like this, sensors, transmission computers, and actuators work electrically to regulate the clutch and brake work on the AT transmission through hydraulic pressure.
When one of the components in the AT electrical system has a problem, in addition to turning on the AT indicator light on the driver's dashboard panel, it can also cause the automatic transmission car to jerk when operating. For the examination, a special scanner is needed according to the transmission and the brand of the car.
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5. Incorrect kick-down accelerator cable adjustment
The next cause of jerking automatic transmission is due to improper adjustment of the kick-down accelerator cable. This kick-down accelerator cable is generally owned by cars with older automatic transmission models whose components work mechanically. For the latest generation of the automatic transmission, cars have not used this kick-down accelerator cable.
This kick-down accelerator cable is commonly installed near the throttle valve connected to the accelerator pedal. This cable serves to adjust the throttle valve opening to the kick-down position on the automatic transmission.
Kick-down will occur when the gas pedal is pressed deeply and suddenly. This kick-down will lower the gear position in the transmission to get the expected torque and speed acceleration. When the kick-down accelerator cable adjustment is not correct, it will cause a shock on the automatic transmission car.
6. There is a problem with the EFI system related to the AT system.
The last cause of the jerking automatic transmission that we know is that there is a problem with the car's EFI system related to the work of the AT system. Yes, the EFI system and the AT electrical work system are connected.
These two systems also often use data from the same sensors to synchronize with each computer. That way, the two systems will work together to produce optimal engine and transmission performance.
When a problem occurs on one or some of the sensors used together, the problem will disrupt these systems. One of which will cause the automatic transmission to jerk.
Therefore, an automatic transmission car with an EFI system, in addition to checking the work of the EFI system, is also required to check the automatic transmission control system.