Honda 2004 Odyssey Service Manual page 677

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 side of the lock-up shift valve. The lock-up shift valve is moved to the
left side to switch the port leading torque converter pressure to the left side and right side of the torque converter.
Torque converter pressure (92) flows to the right side of the torque converter to engage the torque converter clutch.
The PCM also controls A/T clutch pressure control solenoid valves A and B, and LS A or LS B pressure is applied to the
lock-up control valve and the lock-up timing valve. The position of the lock-up control valve depends on torque
converter pressure and LS A or LS B pressure. When LS A or LS B pressure (58) is lower, torque converter pressure
(91) from the lock-up timing valve is lower. The torque converter clutch is engaged partially. LS A or LS B (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 condition is partial lock-up.
NOTE: When used, ''left'' or ''right'' indicates direction on the hydraulic circuit.
14-64
TORQUE CONVERTER
91
90
94
TORQUE CONVERTER
CLUTCH SOLENOID
VALVE
X LOCK-UP TIMING
VALVE
X
90 91
90' 91' 58
X X
LA 94 91' 91 6
96 92
93
LOCK-UP SHIFT
VALVE
90 97
90 58
90
93 92
X
93
LOCK-UP CONTROL
X
VALVE
TORQUE
CONVERTER
CHECK VALVE
COOLER
CHECK VALVE
93
92 2 95
X
X
RELIEF VALVE
REGULATOR VALVE
99
ATF COOLER
MODULATOR PRESSURE
LS A or LS B PRESSURE
MAINSHAFT
COUNTER-
SHAFT
AX
MX
SECONDARY
SHAFT
95' 95'
X
LUBRICATION
CHECK VALVE
ATF PUMP