Torque converter lock-up valve, automatic transmission 01M
Target:
* Prevent torque converter slipping after reaching a certain speed.
* Improved fuel efficiency and performance.
Design:
* Located inside the automatic transmission, in the torque converter housing.
* Consists of solenoid, spring, piston and control holes.
Working principle:
* When a certain speed is reached (usually about 60 km/h), the electronic control unit (ECU) sends a signal to the solenoid.
* The solenoid activates the valve, directing hydraulic pressure to the piston.
* The pressure pushes the piston up, closing the control holes.
* This creates a hydraulic connection between the pump and turbine parts of the torque converter, locking it.
When the valve is faulty:
* Torque converter slippage.
* Reduced fuel efficiency.
* Performance degradation.
* Noise or vibration when the torque converter locks up.
Diagnostics:
* Checking fault codes.
* Checking hydraulic pressure.
* Valve solenoid test.
Repair:
* Cleaning or replacing the valve.
* Replacement of solenoid.
* Overhaul or replacement of automatic transmission in severe cases.