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Description
Lock-up System (cont'd)
Half Lock-up
Lock-up Control Solenoid Valve A: ON Lock-up Control Solenoid Valve B: ON
Modulator pressure is released by solenoid valve B, causing modulator pressure in the left cavity of the lock-up control
valve to lower.
Also, modulator pressure in the left cavity of the lock-up timing valve B is low. Throttle B pressure is still low at this time,
so, lock-up timing valve B is kept on the right side by spring force.
With lock-up control solenoid valve B turned ON, the lock-up control valve is moved somewhat to the right side, causing
back pressure (F2) to lower. This allows move fluid (F1) to work on the lock-up clutch to engage the clutch. Back pressure
(F2), which still exists, prevents the clutch from engaging fully.
NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.
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