Torque Converter Clutch Solenoid: Description and Operation

SYSTEM DESCRIPTION
The ECM controls torque converter clutch solenoid valve to cancel the lock-up condition of A/T. When the solenoid valve is turned on, lock-up is cancelled. When the solenoid valve is turned off, A/T lock-up is operational.
Conditions for lock-up cancel:
- Throttle valve is fully closed (idling or deceleration)
- Engine coolant temperature is below 60°C (140°F)
- Vehicle speed is less than 64 km/h (40 MPH)
- During high-load operation