Possible causes of shocks when shifting gears in a Toyota Prado 120 automatic transmission:
1. Low transmission fluid level
* Fluid leak from transmission system
* Insufficient filling of fluid when replacing it
* Wear of seals and gaskets
2. Contaminated or old transmission fluid
* Transmission fluid loses its lubricating properties over time and accumulates debris and metal particles.
* Contaminated fluid can cause a decrease in system pressure and make it difficult to shift gears.
3. Clutch slippage
* Clutches in automatic transmissions wear out over time and no longer engage effectively.
* This may cause gear slipping and shifting shock.
4. Worn solenoids or valves
* Solenoids and valves are responsible for controlling the flow of transmission fluid.
* Worn or faulty components can cause improper shifting and jerking.
5. Torque converter malfunction
* The torque converter transfers power from the engine to the transmission.
* Malfunctions of the torque converter can lead to shocks and vibrations.
6. Problems with the electronic control unit (ECU)
* The ECU controls the operation of the automatic transmission.
* ECU malfunctions can result in incorrect signals that cause jerks when shifting gears.
7. Wiring faults
* Damaged or worn wiring can disrupt communication between the ECU and other automatic transmission components.
* This can lead to improper operation of the automatic transmission and jolts.
What to do:
1. Check the transmission fluid level.
2. Check the condition of the transmission fluid. It should be clean and red.
3. Carry out computer diagnostics. This will help identify potential faults in the automatic transmission electrical system.
4. Contact a qualified mechanic. To eliminate the malfunction, it may be necessary to replace the transmission fluid, repair or replace automatic transmission components.