Torque Converter Clutch Solenoid Valve Control

WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

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.

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

Fig 1: Identifying Torque Converter Clutch Solenoid Valve

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

Fig 2: Pilot Pressure To Torque Converter Clutch Characteristic

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

Fig 3: Drain Fluid Flow Chart

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