Caprice Wagon V8-350 5.7L (1994)
Pressure Control Solenoid (PCS): Description and Operation
Pressure Control Solenoid Circuit.
Purpose:
The Pressure Control Solenoid (PCS), or force motor, is a pressure regulator that controls line pressure based on current flow through its coil
winding. The magnetic field produced by the coil move the solenoids internal valve which varies pressure to the pressure regulator valve.
Operation:
The PCM controls the pressure control solenoid by commanding current between 0 and 1.1 amps. This changes the duty cycle of the solenoid,
which can range between 0% and 60%. 1.1 amps corresponds to minimum line pressure, and 0 amps to maximum line pressure. Should the
solenoid lose power the transmission will still have maximum line pressure.
Line pressure values are calculated by the PCM using inputs such as throttle position. The pressure control solenoid takes the place of the throttle
valve that was used on past model transmissions.
Location:
The Pressure Control Solenoid (PCS) is attached to the valve body inside the transmission.
