Control of Shift Solenoid Valves A and B

The TCM activates shift solenoid valves A and B according to signals from the throttle position sensor [accelerator pedal position (APP) sensor] and revolution sensor to select the optimum gear position on the basis of the shift schedule memorized in the TCM. The shift solenoid valve performs simple ON-OFF operation. When set to "ON", the drain circuit closes and pilot pressure is applied to the shift valve.

Fig 1: Identifying Control Shift Solenoid Valves A And B Position

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

Fig 2: Relation Between Shift Solenoid Valves A And B And Gear Positions

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

Fig 3: Identifying Control Of Shift Valves A And B Position

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.