Honda 2004 Odyssey Service Manual page 922

Lock-up System
The lock-up mechanism operates in the D position (3rd, 4th, and 5th), and D3 position (3rd). The pressurized fluid is
drained from the back of the torque converter through a fluid passage, causing the torque converter clutch piston to be
held against the torque converter cover. As this takes place, the mainshaft rotates at the same speed as the engine
crankshaft. Together with hydraulic control, the PCM optimizes the timing of the lock-up mechanism. When the torque
converter clutch solenoid valve activates, modulator pressure changes to switch lock-up ON and OFF. The lock-up
control valve and the lock-up timing valve control the amount of lock-up according to A/T clutch pressure control
solenoid valve C. The torque converter clutch solenoid valve is mounted on the torque converter housing, and A/T
clutch pressure control solenoid valve C is mounted on the transmission housing. They are controlled by the PCM.
TORQUE CONVERTER
CLUTCH SOLENOID
VALVE
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
AX
93
95
TORQUE X
X
CONVERTER
RELIEF VALVE
CHECK VALVE
92 1 95
93' X
COOLER CHECK
1
VALVE
99
ATF FILTER
REGULATOR VALVE
MAINSHAFT
AX
COUNTERSHAFT
HX
SECONDARY
SHAFT
X
95 95'
LUBRICATION
CHECK VALVE
ATF PUMP
(cont'd)
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