Honda 2004 Odyssey Service Manual page 925

Automatic Transmission
System Description (cont'd)
Lock-up System (cont'd)
Partial Lock-up
As the speed of the vehicle reaches the prescribed value, the torque converter clutch solenoid valve is turned ON by
the PCM to release LC pressure (LA) in the left cavity of the lock-up shift valve. Modulator pressure (6) is applied to the
right side of the lock-up shift valve, then the lock-up shift valve is moved in the left side to switch the port leading
torque converter pressure to the right side of the torque converter. Torque converter pressure (91) is applied 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 LS C pressure (58) is applied to the lock-up control valve and the lock-up timing valve.
When LS C pressure (58) is lower, torque converter pressure (91) from the lock-up timing valve is lower. The torque
converter clutch is engaged partially. LS C pressure (58) increases, and the lock-up timing valve is moved to the left
side to uncover the port leading torque converter pressure to high. The torque converter clutch is then engaged
securely. Under this condition, the torque converter clutch is engaged by pressure from the right side of the torque
converter; this lock-up condition is partial lock-up.
NOTE: When used, ''left'' or ''right'' indicates direction on the hydraulic circuit.
TORQUE CONVERTER
CLUTCH SOLENOID
VALVE
14-312
TORQUE
CONVERTER
91
90
94
6
LA
X
90 91 X
X X
90' 91' 58
LOCK-UP
TIMING VALVE
LOCK-UP
LA 94 91' 91 SHIFT VALVE
96 92 93 6
X
95
90' 96 58 96
90 93 92
X
X
LOCK-UP
CONTROL
95
90 VALVE
2
93
95
TORQUE X
X
CONVERTER
RELIEF VALVE
CHECK VALVE
92 1 95
93' X
COOLER CHECK
1
VALVE
99
ATF FILTER
REGULATOR VALVE
MODULATOR PRESSURE
LS C PRESSURE
AX
MAINSHAFT
AX
COUNTERSHAFT
HX
SECONDARY
SHAFT
95' X
95
LUBRICATION
CHECK VALVE
ATF PUMP