What is an Evo sensor?

EVO means Electronic Variable Orifice. The EVO valve is a key component in variable assist systems. A properly functioning system requires proper operation of the EVO valve (see below), control module and vehicle speed sensor.

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.

Beside above, how does variable power steering work? Variable assist power steering is a nice system that regulates hydraulic pressure to provide greater assist at idle or slow speeds and reduce the assist at higher speeds. This allows for a better steering feel at speed and reduces the possibility of over-steering in a evasive or abrupt maneuver.

Also, how do I know if I have variable assist power steering?

Look at your Service Parts Identification label. This is located on the underside of the cover over your spare tire. If you see the 3 character code NV7, then you do have variable effort steering. This is built in as part of the steering rack so you won’t see a separate component.

How do you remove a power steering pump from a reservoir?

Locate the reservoir on the body of the power steering pump. There will be two metal tabs that hold the reservoir to the pump body. Pry these with a flat screwdriver and pull the power steering reservoir from the pump body. You will notice a metal nipple coming from the pump.

How do I know if my power steering pump is failing?

Symptoms of a bad or failing power steering pump Whining noise while turning the wheel. If you hear a whining noise while turning the wheel of your vehicle, something is wrong with your power steering system. Steering wheel slow to respond. Stiff steering wheel. Squealing noises when the vehicle starts. Groaning noises.

How do I know if my power steering pressure switch is bad?

Symptoms of a Bad or Failing Power Steering Pressure Switch Engine slowing down. As soon as the power steering pressure switch starts to go bad, the computer will not be able to keep up with the demand of the power steering system and make proper adjustments. Engine stalling. Speeding up and slowing down. Check Engine Light comes on.

What does a steering wheel speed sensor do?

Wheel-speed sensors: One wheel-speed sensor at each wheel measures the speed of the wheel which the computer can then compare to the speed of the engine. Steering-angle sensors:This sensor, in the steering column, measures the direction the driver intends to aim the car.

What is an Evo valve?

EVO means Electronic Variable Orifice. The EVO valve is a key component in variable assist systems. A malfunction in the EVO valve can result in loss of regulated assist or even complete loss of power assist. However, this problem often is mistakenly perceived to be a defective power steering pump or steering gear.

How much does it cost to replace power steering pressure switch?

The average cost for a power steering pump replacement is between $503 and $729. Labor costs are estimated between $167 and $212 while parts are priced between $336 and $517.

What is speed sensitive power steering?

Our speed-sensitive power steering enhances maneuverability and comfort, boosting safety. Power assistance is at its highest at low speed, when you’re parking or maneuvering, making the car very easy to handle. At higher speeds, an electronic sensing system gradually reduces the level of power assistance.

What control the amount of assist in most power steering systems?

At its most basic level, the steering system’s power steering pump can generate up to 2,000 psi of hydraulic pressure. This hydraulic pressure is metered to a steering assist cylinder through a steering gear pressure control valve.

What is magnetic variable assist steering?

Variable-assist, variable-rate or variable-effort power steering is used on a growing number of vehicles. Variable assist is a way of providing the best of both worlds: finger-tip parking maneuverability at low speed and reduced assist at higher speeds for greater stability and road feel.

What is variable ratio steering?

Variable – ratio steering is a system which uses different ratios on the ball, in a rack and pinion steering system. At the center of the rack, the spaces between the teeth are smaller and the spaces become larger as the pinion moves down the rack.

How do you fix a power steering pump?

How to Replace a Power Steering Pump Shut off the engine and let it cool off. Locate and identify the power steering pump. Remove the power-steering belt from the pump. Place a pan under the pump and drain the power-steering fluid from the pump by disconnecting the feed and return lines. Remove the mounting bolts from the mounting bracket.

Can you drive without power steering?

Driving your car for extended periods without power steering fluid can damage the pump. While there’s nothing that physically stops you from driving your car if you have a power steering fluid leak, once the level drops, your pump runs dry. This causes increased friction and heat and can quickly cause expensive damage.

How does the steering system work?

The steering system converts the rotation of the steering wheel into a swivelling movement of the road wheels in such a way that the steering-wheel rim turns a long way to move the road wheels a short way. The system allows a driver to use only light forces to steer a heavy car.

What are the parts of the power steering system?

The major power steering system components between the steering wheel and steering gear include the steering wheel itself, steering column, steering coupler, steering gear, power steering hoses, and power steering pump.

How does power steering work diagram?

The hydraulic power for the steering is provided by a rotary-vane pump (see diagram below). As the vanes spin, they pull hydraulic fluid from the return line at low pressure and force it into the outlet at high pressure. The amount of flow provided by the pump depends on the car’s engine speed.