Possible causes of shocks when shifting gears in an Almera automatic transmission:
1. Problems with automatic transmission oil:
*Low oil level
* Contaminated or burnt oil
2. Malfunctions of automatic transmission solenoids:
* Clogged or faulty solenoids
* Electrical problems with solenoids
3. Problems with the torque converter:
* Worn or damaged locking clutch
* Torque converter slipping or vibration
4. Malfunctions of mechanical components of automatic transmission:
* Worn or damaged clutches
* Faulty gears or bearings
5. Problems with the automatic transmission control unit (automatic transmission ECU):
*Software bugs
* Faulty wiring or connectors
6. Other reasons:
* Sensor malfunctions (for example, speed sensor)
*Wiring or grounding problems
* Air in the automatic transmission system
Diagnostics and troubleshooting:
1. Check the level and condition of the automatic transmission oil: Remove the dipstick and check the oil level. It should be clean and red. If the oil is dirty or burnt out, it must be replaced.
2. Connect the diagnostic scanner: The scanner will display trouble codes that will help identify the faulty component.
3. Check solenoids and torque converter: If necessary, these components should be removed and inspected for damage.
4. Disassemble the automatic transmission: If other methods fail, you may need to disassemble the automatic transmission and check the mechanical components for wear or damage.
5. Reprogram the automatic transmission ECU: If errors are found in the software, the automatic transmission ECU can be reprogrammed.
Important: Self-repair of automatic transmission is not recommended. Have the problem diagnosed and repaired by a qualified mechanic.