Possible causes of oil leakage from a Toyota automatic transmission:
1. Damage to gaskets or seals:
* Seals for input and output shafts
* Automatic transmission pan gasket
* Heat exchanger gasket
* Automatic transmission housing gaskets
2. Worn or damaged O-rings:
* Shaft sealing rings
* O-rings for pistons and couplings
* Pump O-rings
3. Damage to the automatic transmission housing:
* Cracks or holes in the housing
* Damage to threaded connections
4. Torque converter malfunction:
* Damage to torque converter seal
* Worn torque converter bearings
5. Excessive pressure in the automatic transmission:
* Clogged oil filter
* Faulty pressure regulator
* Clogged oil channel
6. Low oil level in automatic transmission:
* Leaks from other places
* Evaporation or spraying of oil
7. Inappropriate automatic transmission oil:
* Using the wrong type or viscosity of oil
* Contaminated or used oil
8. Other reasons:
* Weak or damaged transmission pan bolts
* Corrosion of automatic transmission elements
* Biting or jamming of automatic transmission components
Diagnosis of automatic transmission oil leakage:
1. Visual inspection of the underbody of the car and the area around the automatic transmission for oil leaks.
2. Checking the level and condition of the automatic transmission oil.
3. Using a diagnostic scanner to read fault codes associated with the automatic transmission.
4. Listening to extraneous noise or vibrations during automatic transmission operation.
5. Check the automatic transmission pan for signs of leaks or damage.
Automatic transmission oil leak repair:
Repair work depends on the cause of the leak and may include:
* Replacement of gaskets, seals or O-rings
* Replacement or repair of automatic transmission housing
* Maintenance or replacement of the torque converter
* Replacing the oil filter or pressure regulator
* Topping up or changing automatic transmission oil
* Fix other root causes of leaks
It is important to promptly repair oil leaks from the automatic transmission, as this can lead to serious damage and costly repairs.