Torque Converter Clutch Solenoid: Description and Operation

TORQUE CONVERTER CLUTCH SOLENOID VALVE
The lock-up solenoid valve is activated, with the gear in D4, by the A/T control unit in response to signals sent from the vehicle speed and throttle position sensors. Lock-up piston operation will then be controlled. Lock-up operation, however, is prohibited when ATF temperature is too low.