General malfunctions of the Toyota Corona Premio automatic transmission
Gear slippage
* When changing gears, the engine speed increases, but the car does not accelerate enough.
* Reason: wear of friction discs, insufficient oil pressure.
Difficulty shifting gears
* Gear shifts are delayed or jerky.
* Cause: clogged solenoids, lack of oil, faulty control unit.
No reverse gear
* Reverse gear does not engage or engages with a strong impact.
* Reason: malfunction of the reverse clutch pack, breakage of the reverse belt.
Transmission fluid leaks
* A red fluid leak is detected under the car.
* Reason: damage to oil seals, pipes or automatic transmission pan gasket.
Vibration
* Vibration is felt while driving, which intensifies as speed increases.
* Reason: bearing wear, driveshaft misalignment, torque converter imbalance.
Extraneous noise
* Noises (hum, grinding, howling) when shifting gears or while driving.
* Reason: wear of gears, bearings, damage to the planetary mechanism.
Other faults
* Lack of response to shifting the gear selector.
* Automatic transmission fault indicator flashing.
* Limited gear range (for example, high gears do not work).
Possible reasons
*Low or contaminated transmission fluid.
* Malfunction of sensors and solenoids.
* Wear of mechanical components (gears, clutches, bearings).
* Electrical problems (wiring, control unit).