Line Pressure Control: Notes

When torque signals corresponding to the engine drive power is sent from the ECM to the TCM, the TCM controls the line pressure solenoid. Using the line pressure solenoid pressure as a signal pressure, the pressure regulator valve is controlled, and the ATF discharged from the oil pump is regulated to an optimum level corresponding to the vehicle's running conditions.

Fig 1: Flow Chart Of Line Pressure Control

Courtesy of SUBARU OF AMERICA, INC.