Lock-up Control
Shift solenoid valve D controls the hydraulic pressure to switch the lock-up shift valve and lock-up ON and OFF. The PCM turns shift solenoid valve D and A/T clutch pressure control solenoid valve A ON, and lock-up starts. A/T clutch pressure control solenoid valve A regulates and applies hydraulic pressure to the lock-up control valve to control the amount of lock-up.
The lock-up mechanism operates in ail five gears.