Honda 2004 Odyssey Service Manual page 660

Hydraulic Flow
Distribution of Hydraulic Pressure
As the engine turns, the ATF pump starts to operate. Automatic transmission fluid (ATF) is drawn through the ATF
strainer (filter) and discharged into the hydraulic circuit. Then, ATF flowing from the ATF pump becomes line pressure
that's regulated by the regulator valve. Torque converter pressure from the regulator valve enters the torque converter
through the lock-up shift valve and it is discharged from the torque converter. The torque converter check valve
prevents torque converter pressure from rising.
The PCM controls the shift solenoid valves ON and OFF, and the shift solenoid valves control shift solenoid pressure
to the shift valves. Applying shift control solenoid pressure to the shift valves moves the position of the shift valve,
and switches the port of hydraulic pressure. The PCM also controls A/T clutch pressure control solenoid valves A and
B. The A/T clutch pressure control solenoid valves regulate the A/T clutch pressure control solenoid pressure and
apply the A/T clutch pressure control solenoid pressure to CPC valves A and B.
When shifting between upper gear and lower gear, the clutch is engaged by pressure from the CPC pressure mode.
The PCM controls one of the shift solenoid valves to move the position of the shift valve. This movement switches the
port of the CPC and line pressure. Line pressure is then applied to the clutch, and the CPC pressure is intercepted.
Engaging the clutch with line pressure happens after CPC pressure mode has completed.
Hydraulic pressure at the ports is as follows:
PORT DESCRIPTION OF
NO. PRESSURE
1 LINE
3 LINE
3' LINE
3'' LINE
4 LINE
4' LINE
4'' LINE
4A CPC A
4B CPC B
5A CPC A
5D CPC B
5B CPC A or LINE
5E CPC A or LINE
5F CPC A or LINE
5F' CPC A or LINE
5C CPC B or LINE
5G CPC B or LINE
NOTE:
• CPC: Clutch Pressure Control pressure
• SH: Shift Solenoid pressure
• LS: A/T Clutch Pressure Control Solenoid pressure
• LC: Torque Converter Clutch Solenoid pressure
PORT DESCRIPTION OF
NO. PRESSURE
5H CPC B or LINE
5J CPC B or LINE
5K CPC B or LINE
5K' CPC B or LINE
6 MODULATE
SA SH A
SB SH B
SC SH C
LA LC
9 LINE
10 1ST CLUTCH
20 2ND CLUTCH
25 LINE
30 3RD CLUTCH
40 4TH CLUTCH
41 4TH CLUTCH
56 LS A
PORT DESCRIPTION OF
NO. PRESSURE
57 LS B
58 LS A or LS B
90 TORQUE CONVERTER
90' TORQUE CONVERTER
91 TORQUE CONVERTER
91' TORQUE CONVERTER
92 TORQUE CONVERTER
93 ATF COOLER
94 TORQUE CONVERTER
95 LUBRICATION
95' LUBRICATION
96 TORQUE CONVERTER
97 TORQUE CONVERTER
99 SUCTION
X DRAIN
HX HIGH POSITION DRAIN
AX AIR DRAIN
(cont'd)
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