Line Pressure Control (LPC) Solenoid: Notes

The LPC solenoid is a Variable Force Solenoid (VFS) that varies hydraulic pressure by actuating a hydraulic valve.

The PCM applies variable current to the LPC solenoid which varies pressure in the VBS LINE hydraulic circuit to the main pressure regulator valve. Refer to HYDRAULIC CIRCUITS  for additional information.

The LPC solenoid uses inversely proportional operation. As the current from the PCM decreases, the pressure from the solenoid increases. As the current from the PCM increases, the pressure from the solenoid decreases. The LPC solenoid is supplied hydraulic pressure from the SOL FD circuit.

With zero current, the LPC solenoid fully opens the hydraulic valve which applies the maximum amount of hydraulic pressure to the Main Pressure Regulator Valve through the VBS LINE hydraulic circuit and applies maximum line pressure in the LINE hydraulic circuit. With maximum current to the solenoid, the hydraulic valve fully closes the outlet port for minimum pressure to the VBS LINE hydraulic circuit to lower the line pressure in the LINE hydraulic circuit.