What is EVO on power steering?
E.V.O. stands for Electronically Variable Orifice. This component is controlled by an electronic control module that reduces fluid pressure from the power steering pump to the steering gear at highway speeds. Improved high speed handling and road feel is the result.
How does electronic variable orifice ( EVO ) steering system work?
The “Electronic Variable Orifice” (EVO) steering system was introduced by General Motors. The vehicle’s computer monitored vehicle speed and steering wheel action to activate and deactivate a solenoid on the steering pump that controlled fluid flow to the steering gear. At slow speeds the EVO solenoid is fully open making the steering easier.
What does the Evo valve do in a car?
The EVO valve is a key component in variable assist systems. While vehicle manufacturer terminology may differ, a typical system works like this: At speeds below 40 MPH, the Electronic Variable Orifice valve (EVO) is completely open, allowing full hydraulic flow from the power steering pump through the steering unit for maximum power assist.
What do you need to replace an Evo solenoid?
The concept GM used for replacing the EVO solenoid has been integrated into the aftermarket. The EVO actuator (bypass pipe) replacement pumps have a direct con nection to the power steering pressure hose. The pumps with bypass pipes installed fit the same as the OE unit and function as a standard steering system would.
What is the Evo number on a Cardone power steering pump?
Refer to the vehicle manufacturers’ service manual for specific test procedures prior to changing any power system component. CARDONE Power Steering Pump numbers ending with “V1” or “V2” (i.e. 20-8747V1) are supplied with the EVO valve. Rack and Pinions ending with “E” are supplied with rack- mounted EVO valve.
The “Electronic Variable Orifice” (EVO) steering system was introduced by General Motors. The vehicle’s computer monitored vehicle speed and steering wheel action to activate and deactivate a solenoid on the steering pump that controlled fluid flow to the steering gear. At slow speeds the EVO solenoid is fully open making the steering easier.
The EVO valve is a key component in variable assist systems. While vehicle manufacturer terminology may differ, a typical system works like this: At speeds below 40 MPH, the Electronic Variable Orifice valve (EVO) is completely open, allowing full hydraulic flow from the power steering pump through the steering unit for maximum power assist.
Where is the Evo valve on a power steering pump?
The EVO valve is mounted at the power steering pump outlet and uses an electronic controller to produce magnetic field changes in its solenoid coil. The valve pin attached to the orifice valve extends into the solenoid coil, and the magnetic field generated by the solenoid coil will pull the pin into the coil.
Can a defective wheel speed sensor cause an Evo?
A defective EVO wheel speed sensor will result in either excessive steering assist, or gaps in steering assist. GM part numbers for repairs, as well as modifications, are given in the video.