Honda 2004 Odyssey, Service Manual

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Hydraulic Flow
Distribution of Hydraulic Pressure
14-47
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
NO.
DESCRIPTION OF
PRESSURE
PORT
NO.
DESCRIPTION OF
PRESSURE
PORT
NO.
DESCRIPTION OF
PRESSURE
1 LINE 5H CPC B or LINE 57 LS B
3 LINE 5J CPC B or LINE 58 LS A or LS B
3’ LINE 5K CPC B or LINE 90 TORQUE CONVERTER
3’’ LINE 5K’ CPC B or LINE 90’ TORQUE CONVERTER
4 LINE 6 MODULATE 91 TORQUE CONVERTER
4’ LINE SA SH A 91’ TORQUE CONVERTER
4’’ LINE SB SH B 92 TORQUE CONVERTER
4A CPC A SC SH C 93 ATF COOLER
4B CPC B LA LC 94 TORQUE CONVERTER
5A CPC A 9 LINE 95 LUBRICATION
5D CPC B 10 1ST CLUTCH 95’ LUBRICATION
5B CPC A or LINE 20 2ND CLUTCH 96 TORQUE CONVERTER
5E CPC A or LINE 25 LINE 97 TORQUE CONVERTER
5F CPC A or LINE 30 3RD CLUTCH 99 SUCTION
5F’ CPC A or LINE 40 4TH CLUTCH X DRAIN
5C CPC B or LINE 41 4TH CLUTCH HX HIGH POSITION DRAIN
5G CPC B or LINE 56 LS A AX AIR DRAIN
NOTE:
• CPC: Clutch Pressure Control pressure
• SH: Shift Solenoid pressure
• LS: A/T Clutch Pressure Control Solenoid pressure
• LC: Torque Converter Clutch Solenoid pressure
(cont’d)
03/07/29 09:29:34 61S0X050_140_0050