Lock-up and Select Control: Notes

• The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to increase power transmission efficiency.
• The torque converter clutch control valve operation is controlled by the torque converter clutch solenoid valve, which is controlled by a signal from TCM. The torque converter clutch control valve engages or releases the torque converter clutch piston.
• When shifting between "N" ("P") → "D" ("R"), torque converter clutch solenoid controls engagement power of forward clutch and reverse brake.
• The lock-up applied gear range was expanded by locking up the torque converter at a lower vehicle speed than conventional CVT models.

Fig 1: Throttle Opening Versus Vehicle Speed Graph

Courtesy of NISSAN NORTH AMERICA, INC.