Driving in 5th gear
The condition of shift solenoid valves A and B in 5th gear remains the same as in 4th gear, which turns shift solenoid valve A OFF and shift solenoid valve B ON and OFF (depending on the shift map). As the speed of the vehicle reaches the programmed value, the PCM activates A/T clutch pressure control solenoid valve A, and applies CPC pressure (55) to the shift valve A pressure port (55). As shift solenoid valve A remains OFF, shift valve A is moved to the left side by a spring force, to connect the CPC pressure port (55) on shift valve A and the 5th clutch pressure port (50). With this shift valve A movement, the CPC pressure (55) becomes 5th clutch pressure (50) at shift valve A, and flows to the 5th clutch. Then the 5th clutch is engaged by 5th clutch pressure (50). 1st clutch is also engaged, but since the rotation speed of the countershaft exceeds that of 1st gear, no power is transmitted because the one-way clutch causes 1st gear to free-wheel.