Torque Converter Clutch

The Torque Converter Clutch (TCC) system uses a solenoid operated valve, in the automatic transmission, to couple the engine flexplate to the output shaft of the transmission through the torque converter.

In order for the TCC to apply, the following conditions must be met: transmission fluid pressure must be correct. The ECM must complete the ground circuit to energize the TCC apply solenoid in the transmission. The solenoid moves a check ball and allows hydraulic pressure to apply the torque converter clutch.

After the torque converter clutch applies, the ECM uses the information from the throttle position sensor to release the clutch when vehicle is accelerating or decelerating at a certain rate. The normally closed brake switch opens when brake pedal is depressed, de-energizing the TCC solenoid.