Power Steering Pump Fluid Flow Control Valve Actuator

The power steering pump actuator assembly is located at the power steering pump discharge fitting. The power steering pump actuator assembly contains an electronic variable orifice (EVO) solenoid-operated pintle valve. Fluid leaving the pump passes through an orifice in the actuator tip. When the EVO solenoid is grounded by the speed sensitive power steering (SSPS) control module, the solenoid moves the pintle into the orifice. The movement of the pintle into the orifice reduces the power steering fluid flow. As vehicle speed increases, the pintle blocks more of the orifice.

Variable effort steering (VES) system components are similar to non-VES power steering components.