Possible reasons for poor shifting of the Toyota Corolla automatic transmission:
Mechanical problems:
* Worn friction discs
* Damaged gears
* Clogged automatic transmission filter
* Faulty torque converter
Electrical or electronic problems:
* Faulty automatic transmission solenoid
* Damaged wiring
* Problems with speed sensor
* Engine control module (ECM) malfunction
Fluid problems:
* Low automatic transmission fluid level
* Contaminated automatic transmission fluid
* Incorrect automatic transmission fluid type
Other possible reasons:
* Problems with the hydraulic control unit
* Worn clutch bushings
* Clogged automatic transmission fluid channels
Diagnosis and problem solving:
1. Checking the level and condition of the automatic transmission fluid: Check the automatic transmission fluid level on a hot engine. The liquid should be red or pink and not have a burning smell.
2. Collecting Trouble Codes: Use the scanner code to check for any trouble codes related to the automatic transmission.
3. Visual inspection: Inspect the automatic transmission for leaks or damage.
4. Test Drive and Observation: Take a test drive and look for the following signs:
* Slipping or jerking when shifting gears
* Delays when shifting gears
*Shocks or vibrations when shifting gears
5. Professional Diagnosis: If you cannot find an obvious cause, have it professionally diagnosed by a qualified mechanic. They may need to perform further diagnostics using special equipment, such as an automatic transmission pressure gauge or scanner.
Repair recommendations:
* Do not attempt to repair an automatic transmission yourself unless you have the appropriate knowledge and experience.
*If parts need to be replaced, use only genuine parts or parts from an authorized Toyota dealer.
* After repair, it is necessary to correctly configure the automatic transmission to ensure smooth gear shifting.