Honda ACCORD HYBRID 2005 Service Manual page 908

Automatic Transmission
S y s t e m D e s c r i p t i o n ( c o n t ' d )
Lock-up System (cont'd)
Partial Lock-up
As the speed of the vehicle reaches the p r o g r a m m e d value, the PCM turns shift solenoid valve D O N , and shift
solenoid valve D uncovers the port of shift solenoid valve D pressure (SD) to the lock-up shift valve. The lock-up shift
valve is m o v e d to the left side to uncover the port of torque converter pressure (91) leading to the right side of the
torque converter to engage the torque converter clutch. The PCM also controls A/T clutch pressure control solenoid
valve C, and A/T clutch pressure control solenoid valve C pressure (58) is applied to the lock-up control valve and lock-
up t i m i n g valve. W h e n A/T clutch pressure control solenoid valve C pressure (58) is lower, torque converter pressure
(91) f r o m the lock-up t i m i n g valve is lower. The torque converter clutch is engaged partially. A/T clutch pressure
control solenoid valve C pressure (58) increases, and the lock-up t i m i n g valve is m o v e d to the left side to uncover the
port leading torque converter pressure to high. Under this condition, the torque converter clutch is engaged by
pressure f r o m the right side of the torque converter; this condition is partial iock-up.
NOTE: W h e n used, " l e f t " or " r i g h t " indicates direction on the hydraulic circuit.
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