Seville STS V8-4.6L VIN 9 (1998)
Pressure Regulating Solenoid: Description and Operation
TRANSMISSION PRESSURE CONTROL (PC) SOLENOID VALVE (FORCE MOTOR)
A transmission Pressure Control (PC) Solenoid Valve, also known as a force motor is a three-port, spool valve, electronic pressure regulator. The
solenoid controls pressure based on a flow of current through its coil-winding. The solenoid controls main line pressure by moving a pressure
regulator valve against spring pressure.
The position of the PC Solenoid valve is controlled by a combination of two methods: high side control and low side control. One terminal of the
solenoid receives a fixed frequency signal of 614.0 Hz. This signal varies in positive (+) duty cycle. This feed circuit is called Force HI.
The opposite terminal of the transmission PC solenoid is called Force LO. Force LO provides a ground for the solenoid.
This combination of Force HI and Force LO circuitry controls the actual current through the PC Solenoid valve. This advanced control method assures
instantaneous control of line pressure when changes occur in the Throttle Position Signal (TPS) and adaptive learning.
The resistance on the PC Solenoid valve should measure 3.0 - 7.0 ohms when measured at 20° - 100°C (68° - 212°F).
