Line Pressure Control: Notes

When an input torque signal equivalent to the engine drive force is sent from the ECM to the TCM, the TCM controls the line pressure solenoid.
This line pressure solenoid controls the pressure regulator valve as the signal pressure and adjusts the pressure of the operating oil discharged from the oil pump to the line pressure most appropriate to the driving state.

Fig 1: Line Pressure Control Communication Diagram
Courtesy of NISSAN MOTOR CO., U.S.A.