Automatic transmission diagnostics and repair
1. Diagnostics
* Scan trouble codes (DTC) from the transmission control module (TCM).
* Checking the level and condition of ATF fluid.
* Physical inspection for leaks, noise or damage.
2. Repair
Main components of the automatic transmission:
* Torque converter
* Planetary gears
* Friction discs and steel plates
* Valve body
* Selector lever
* Sensors and solenoids
Common problems and repair procedures:
* ATF leaks: Replace gaskets, seals or hoses.
* Damage to planetary gears: Change planetary gears and shafts.
* Wear of friction discs: Replacement of friction discs and steel plates.
* Valve body failures: Replace or rebuild the valve body.
*Damage to the selector lever: Replace the selector lever and cables.
* Failure of sensors or solenoids: Replacement of faulty sensors or solenoids.
3. Assembly and installation
*Clean all components and housing thoroughly.
*Assemble the transmission following the manufacturer’s instructions.
* Install a new gasket and tighten the bolts to the specified torque.
* Refill with fresh ATF.
4. Testing and adjustment
* Bleed ATF to remove air.
* Carry out a road test to check the operation of the transmission.
*Adjust the throttle cable and selector lever as necessary.
5. Maintenance
*Change ATF fluid and filter regularly.
* Check ATF fluid level.
* Fix leaks immediately.
* Listen for unusual noises or signs of trouble.
Important Notes:
* Repairing an automatic transmission is a complex task that requires special knowledge and equipment.
* Strictly follow the manufacturer’s instructions for a safe and effective repair.
* Use only quality parts and ATF fluid.
*Professional repair is recommended to ensure proper operation and extend the life of the transmission.