Half Lock – up

Half Lock – up

Lock – up Control Solenoid Valve A: ON. Lock – up Control Solenoid Valve B: ON The modulator pressure is released by the solenoid valve B, causing the modulator pressure in the left cavity of the lock – up control valve to lower. Additionally, modulator pressure in the left cavity of the lock – up timing valve and throttle B pressure is low; consequently, the lock – up timing valve is kept on the right side by spring force. With the lock – up control solenoid valve B turned on, the lock – up control valve is moved to the left side, causing the back pressure (F2) to lower. This allows a greater amount of fluid (F1) to partially apply the lock – up clutch. Full application of the clutch is prevented by the back pressure (F2) which is still present.

Key to hydraulic flow diagram

Note: The components shown in this illustration have the same reference letters as those on the preceding pages.

• P Lock – up control solenoid valve A
• Q Lock – up control solenoid valve B
• V Lock – up shift valve
• W Lock – up control valve
• Z Torque converter
• DD Lock – up timing valve
• EE Torque converter check valve
• FF Regulator valve
• II Oil cooler relief valve
• JJ Relief valve
• KK Oil pump
• MM Oil cooler
• XX Modulator pressure
• YY Line pressure