Control of Shift Solenoid Valves A and B

The TCM activates shift solenoid valves A and B according to signals from the ECM (throttle opening) 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: Shift Solenoid Valves A And B On-Off Operation Diagram

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

Fig 2: Solenoid Valves A And B And Gear Positions Relation Chart

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

Fig 3: Shift Solenoid Valves A And B Shift Control Diagram

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.