Control of Shift Solenoid Valves A and B

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

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.

Relation between shift solenoid valves A and B and gear positions

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

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