Possible causes of shocks when switching automatic transmission on Kia Rio 3:
1. Low transmission fluid level:
* Insufficient fluid level results in insufficient lubrication and pressure in the system.
2. Contaminated or old transmission fluid:
* Contaminated fluid may contain sediment and impurities that cause slippage or pressure fluctuations.
3. Torque converter malfunction:
* The torque converter connects the engine and transmission and transmits torque. Its malfunction can cause shocks and slippages.
4. Malfunction of solenoid valves:
* These valves control the flow of fluid in the transmission. A faulty valve can cause incorrect gear shifting.
5. Worn clutch packs:
* Clutch packs are used to engage the clutch when changing gears. Their wear can lead to slipping and jolting.
6. Faulty Transmission Control Module (TCM):
* The TCM controls the transmission and calculates gear shift timing. A faulty TCM can cause erratic shifting and jerking.
7. Electrical or wiring problems:
* Faulty wiring or sensors may send incorrect signals to the TCM, resulting in jerking.
8. Mechanical transmission problems:
* Failure in internal mechanical components such as planetary gears or bearings can cause shocks and noises.
Solution:
1. Check the level and condition of the transmission fluid.
2. If the fluid is dirty or old, replace it with clean new fluid.
3. Diagnose the torque converter and solenoid valves.
4. Replace worn clutch packs.
5. Check and replace the TCM if necessary.
6. Inspect all electrical wiring and sensors.
7. If no electrical problems are found, perform a mechanical inspection of the transmission.