Transmission Pressure Control Solenoid Valve

The Pressure Control Solenoid (PC Sol.) valve is a precision electronic pressure regulator that controls the transmission line pressure. This control is based on the flow of current through the valve's 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 the output fluid pressure regulated by the PCS, which ultimately decreases line pressure.

The Powertrain Control Module (PCM) controls the PCS based on various inputs, including throttle position, fluid temperature, MAP sensor, and gear state.

The PCM controls the PCS on a positive duty cycle at a fixed frequency of 614 Hz. Duty cycle is defined as the 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 PCS electrical circuit at the PCM controls the PCS operation. The PCM provides a ground path for the circuit, monitors average current and continuously varies the PCS duty cycle to maintain the correct average current flowing through the PCS.





The resistance on the PC Sol. valve should measure between 3.5-4.6 ohms at 20°C (68 F).