Driving in reverse gear in R

When R is selected value, the PCM turns shift solenoid valve A ON. Shift solenoid valve A uncover the shift solenoid valve A pressure port (SA) to shift valve A. Shift valve A moves to the right side to uncover the line pressure port (3') and reverse CPC pressure (3B) leading to the 5th clutch. Line pressure (3) flows to the manual valve via the servo valve and shift valve A, and becomes 5th clutch pressure (50) at the manual valve. 5th clutch pressure (50) flows to the 5th clutch, and the 5th clutch is engaged by the line pressure.