Honda 2004 Odyssey, Service Manual

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Hydraulic Flow
Distribution of Hydraulic Pressure
14-292
Automatic Transmission
System Description (cont’d)
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
NO.
DESCRIPTION OF
PRESSURE
PORT
NO.
DESCRIPTION OF
PRESSURE
PORT
NO.
DESCRIPTION OF
PRESSURE
1 LINE 5N CPC A or LINE 56 LS A
2 LINE 5D CPC B or LINE 57 LS B
3 LINE 5G CPC B or LINE 58 LS C
3’ LINE 5K CPC B or LINE 90 TORQUE CONVERTER
3’’ LINE 6 MODULATE 90’ TORQUE CONVERTER
4 LINE SA SH A 91 TORQUE CONVERTER
4’ LINE SB SH B 91’ TORQUE CONVERTER
4’’ LINE SC SH C 92 TORQUE CONVERTER
4A CPC A LA LC A 93 ATF COOLER
4B CPC B 9 LINE 94 TORQUE CONVERTER
4C CPC C 10 1ST CLUTCH 95 LUBRICATION
5B CPC A 15 1ST-HOLD CLUTCH 95’ LUBRICATION
5C CPC B 20 2ND CLUTCH 96 TORQUE CONVERTER
5H CPC B 25 LINE 99 SUCTION
5J CPC B 30 3RD CLUTCH X DRAIN
5A CPC A or LINE 40 4TH CLUTCH HX HIGH POSITION DRAIN
5E CPC A or LINE 50 5TH CLUTCH AX AIR DRAIN
5F CPC A or LINE 51 5TH CLUTCH
5M CPC A or LINE 55 CPC C 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
03/07/29 09:37:22 61S0X050_140_0295