Pressure Regulator Solenoid 1 Coil winding 2 Valve 3 Pressure supply 4 Regulated control pressure 5 Return 6 Spring. The pressure regulator solenoid is located in the valve block and is secured with a spring clip. The solenoid operates in conjunction with the pressure regulator valve to control line pressure supplied to the clutches and shift control valves. The solenoid is controlled by PWM signals from the EAT ECU in response to throttle position and engine torque signals from the ECM. When the solenoid is de-energised the pressure controlled by the solenoid is at maximum. In this condition the valve is moved under the influence of the spring, closing the return port and allowing supply pressure to pass to the clutches and control valves. As the EAT ECU increases the PWM output to the solenoid coil winding, the valve is lifted, against the spring force, opening the return port to the supply pressure. The supply pressure is directed into the return port proportional to the controlled opening of the valve. By varying the PWM signal to the coil winding and consequentially adjusting the valve opening, the pressure regulator solenoid controls the supply pressure and the regulated pressure supplied to the clutches and valves. The pressure regulator solenoid receives the supply pressure from the feed limit valve. The resistance of the solenoid coil winding is between 3.5 and 4.6 Ω at C (68 ° F).