Distribution of Hydraulic Pressure

WARNING: This page is about a different car, the 2013 Honda Odyssey, 2012 Honda Odyssey, and 2011 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

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 is regulated by the regulator valve. Torque converter pressure from the regulator valve enters the torque converter through the lock-up shift valve and the lock-up control valve, and it is discharged from the torque converter. The torque converter check valve prevents torque converter pressure from rising.

The PCM switches shift solenoid valves A, B, C, and D ON and OFF, the shift solenoid valves control pressure to the shift valves. Shift solenoid valve pressure moves the position of the shift valve, and switches the port of hydraulic pressure. The PCM also actuates A/T clutch pressure control solenoid valves A, B, and C. The A/T clutch pressure control solenoid valves regulate hydraulic pressure to CPC valves A, B, and C, and the reverse CPC valve.

When shifting between gears, the clutches are engaged by pressure from the CPC valves. The PCM actuates one of the shift solenoid valves to change the position of the shift valve. This change switches the port of CPC pressure and line pressure. Line pressure is then applied to the clutch, and CPC pressure is released. The clutch is engaged with line pressure after the shift is completed.