Honda 2004 Odyssey Service Manual page 905

Automatic Transmission
System Description (cont'd)
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 turns the shift solenoid valves ON and OFF, and the shift solenoid valves control shift solenoid pressure to
the shift valves. Applying shift 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 gears, 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
2 LINE
3 LINE
3' LINE
3'' LINE
4 LINE
4' LINE
4'' LINE
4A CPC A
4B CPC B
4C CPC C
5B CPC A
5C CPC B
5H CPC B
5J CPC B
5A CPC A or LINE
5E CPC A or LINE
5F CPC A or LINE
5M CPC A or LINE
NOTE:
• CPC: Clutch Pressure Control pressure
• SH: Shift Solenoid pressure
• LS A: A/T Clutch Pressure Control Solenoid A pressure
• LS B: A/T Clutch Pressure Control Solenoid B pressure
• LS C: A/T Clutch Pressure Control Solenoid C pressure
• LC: Torque Converter Clutch Solenoid pressure
14-292
PORT DESCRIPTION OF
NO. PRESSURE
5N CPC A or LINE
5D CPC B or LINE
5G CPC B or LINE
5K CPC B or LINE
6 MODULATE
SA SH A
SB SH B
SC SH C
LA LC A
9 LINE
10 1ST CLUTCH
15 1ST-HOLD CLUTCH
20 2ND CLUTCH
25 LINE
30 3RD CLUTCH
40 4TH CLUTCH
50 5TH CLUTCH
51 5TH CLUTCH
55 CPC C or LINE
PORT DESCRIPTION OF
NO. PRESSURE
56 LS A
57 LS B
58 LS C
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
99 SUCTION
X DRAIN
HX HIGH POSITION DRAIN
AX AIR DRAIN