Pressure Control Solenoid Valve

The Pressure Control Solenoid (PCS) valve is a precision electronic pressure regulator that controls transaxle line pressure. This control is based on flow of current through solenoid coil windings. As the flow of current is increased, the magnetic field which is produced by the coil moves the solenoid's plunger further away from the exhaust port. Opening the exhaust port decreases output fluid pressure regulated by the PC Sol. Valve, which ultimately decreases line pressure.
The Powertrain Control Module (PCM) or Transaxle Control Module (TCM) controls the PC Sol. Valve based on various inputs, including throttle position, fluid temperature, MAP sensor, and gear state.
The PCM/TCM controls the PC Sol. Valve on a positive duty cycle at a fixed frequency of 614 Hz. Duty cycle is defined as percent of time current is flowing through the solenoid coil during each cycle. A higher duty cycle provides a greater current flow through the solenoid. The high (positive) side of the PC Sol. Valve electrical circuit at the PCM/TCM controls PC Sol. Valve operation. The PCM/TCM provides a ground path. The circuit, monitors average current and continuously varies the PC Sol. Valve duty cycle to maintain the correct average current flowing through the PC Sol. Valve.





The resistance on the PC Sol. Valve should measure between 3-5 ohms at 20°C (68°F).