Torque Converter Clutch Solenoid: Description and Operation

Torque Converter Clutch Circuit:

Purpose:
The Torque Converter Clutch (TCC) system uses a solenoid operated valve, in the automatic transmission, to couple the engine flywheel to the output shaft of the transmission through the torque converter, which increases fuel economy.

Operation:
For the TCC to apply, the following conditions must be met:

- Internal transmission fluid pressure must be correct.
- The ECM completes a ground circuit, to energize a TCC apply solenoid in the transmission, which moves a check ball in a fluid line. This allows the converter clutch to apply if the hydraulic pressure is correct.

- Throttle Position Sensor (TPS) - After the converter clutch applies, the ECM uses the information from the TPS to release the clutch, when the vehicle is accelerating, or decelerating, at a certain rate.

- Brake Switch - This switch, in the TCC circuit, opens when the brake pedal is depressed. This de-energizes the TCC solenoid.

Location:
The TCC solenoid is located inside the transmission.