Torque Converter Clutch Solenoid Valve Control

The torque converter clutch solenoid valve is controlled by the TCM. The plunger closes the drain circuit during the "OFF" period, and opens the circuit during the "ON" period. If the percentage of OFF-time increases in one cycle, the pilot pressure drain time is reduced and pilot pressure remains high.

Fig 1: Identifying Torque Converter Clutch Solenoid Valve Control

Courtesy of NISSAN MOTOR CO., U.S.A.

The torque converter clutch piston is designed to slip to adjust the ratio of ON-OFF, thereby reducing lock-up shock.

Fig 2: ON-OFF Ratio Adjustment Flow Chart

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Torque Converter Clutch Solenoid Valve Off Time Ratio To Pilot Pressure Graph

Courtesy of NISSAN MOTOR CO., U.S.A.