Control of Shift Valves A and B

Fig 1: Shift Solenoid Valves Operation Chart

Courtesy of NISSAN MOTOR CO., U.S.A.

Pilot pressure generated by the operation of shift solenoid valves A and B is applied to the end face of shift valves A and B.

The drawing above shows the operation of shift valve B. When the shift solenoid valve is "ON", pilot pressure applied to the end face of the shift valve overcomes spring force, moving the valve upward.