Torque Converter Clutch Mechanism

TORQUE CONVERTER CLUTCH (TCC, LOCK-UP) MECHANISM





TCC (Lock-up) OFF





TCC (Lock-up) ON

On and OFF of TCC is controlled by TCM. When the TCC solenoid valve is OFF, as the line pressure in the passage (A) is relieved by the TCC solenoid valve, the TCC control valve plunger is kept at its upper position by the spring force. In this state, the line pressure in the passage (B) flows to the passage (b) (in front of TCC) and TCC is pushed back and turned OFF. The fluid flowing out of TCC returns to the TCC control valve where it is relieved. When the TCC solenoid valve is ON, the line pressure in the passage (A) is applied to the top of the TCC control valve plunger, overcomes its spring force to push down the plunger. As a result, the line pressure in the passage (B) flows to the passage (a) (behind TCC) by the TCC control valve and TCC is pushed forward against the torque convertercover and turned ON.