Lock-Up Control

Fig 1: Lock-Up Control Communication Diagram

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

The system engages the lock-up clutch in the torque converter to eliminate slips in the torque converter. This improves the transmission efficiency.
The lock-up control valve is controlled by the lock-up solenoid valve, and the lock-up solenoid valve is controlled by the signal from the TCM. The lock-up control valve sets the lock-up clutch into a state of engagement, or disengagement.
It inhibits lock-up operation when the fluid temperature is low.