![]() The steering wheel position sensor is a five-volt, dual analog signal device, but this one operates between 0V to 5V. The PSCM interprets the change in signal voltages as "steering direction" and steering column shaft "applied torque." Simple, really. ![]() Turning to the left decreases Signal 1 Voltage and increases Signal 2 Voltage. Turning the steering wheel to the right increases Signal 1 Voltage and decreases Signal 2 Voltage. It sounds complicated, but it really isn't. This sensor is a five-volt, dual analog inverse signal device operating between 0.25V and 4.75V (as many five-volt reference sensors do – voltage outside of this range usually indicates a circuit problem and sets a DTC). Getting extremely technical, the torque signals are determined by the relative position between the upper and lower rotors of the sensor. The steering shaft torque sensor (located in a section of torsion bar in between the steering input and output shafts) is the Power Steering Control Module's (PSCM) main input for determining steering direction and the amount of assist needed. The EPS system is more efficient than hydraulic systems since it only needs to provide assist when the driver is actually steering (rather than robbing energy from the vehicle's engine to rotate the hydraulic pump constantly), and it keeps the environmentalists happy since there's no harmful fluid involved that needs to be flushed or drained. EPS simply uses an electric motor to provide the assist rather than use a hydraulic pressure system. The idea behind EPS is the same as the idea behind hydraulically assisted power steering systems: reducing the amount of effort needed to turn the steering wheel. And that means that you need to know how the system works, what goes wrong and how to fix it – quickly, safely and profitably. Because the system is such a fuel-saver and also lowers emissions, it's turned up on most of the vehicles on the road. Interestingly, it's not just expensive or luxury models that use EPS. GM vehicles have used electric power steering (EPS) systems for over a decade now, so odds are good you've already worked on a vehicle using the system. Reconnect the car battery (starting with the positive terminal this time), and you should be done.Editor's Note: This article has been updated from its original 2011 version.Fill the power steering fluid reservoir (PS fluid reservoir.).Then, reinstall the serpentine belt (or drive belt), the radiator fan, and shroud.Reattach each pressure line to the new power steering pump.Secure the new pump to the engine block by screwing each bolt through the mounting bracket and onto the engine block.Then, replace the power steering belt and ensure your belt tension is correct.Install the new PS pump and replace the power steering pulley so that it’s aligned with the crankshaft pulley.Then secure it to the bracket using the old mounting bolts. First, transfer the mounting bracket from the old pump body to the new one.This is how to install a new power steering pump: The power steering pump body can now be removed.You can do this using an impact wrench or a socket. Remove the mounting bolts which hold the power steering pump onto the engine block.Using a power steering removal tool, detach the power steering pump pulley by removing the locking nut.This includes each pressure line from the power steering reservoir as well as the return hose and hose clamp from the gearbox. ![]() Once the primary supply line is removed, you can remove all other lines from the power steering pump.Using a socket or ratchet, remove the hydraulic lines that are connected to the bottom of the power steering pump.Then, place a drip tray under your vehicle as there may be a power steering fluid leak (PS fluid leak).First, locate the lines going to your power steering pump.Here’s how to disconnect the power steering pump itself: Finally, remove the radiator fan shroud and the fan to gain clear access to the power steering pump.Then, remove the lower engine covers (skid plate.).To remove the serpentine belt, loosen the tensioner pulley located on the left side (as you look at the engine.) Once loose, you can easily slip off the belt. Detach the serpentine belt or drive belt.Open the hood and remove your engine cover.Using a hydraulic lift or a jack, lift up your vehicle onto jack stands.Before anything else, disconnect your battery (starting with the negative terminal.).You need to access your power steering pump first: With that said, here’s how to perform a power steering pump replacement: 1. However, if you’re not familiar with auto parts, it’s best to let a professional mechanic handle the repair job to avoid hurting yourself or doing any more damage to your car. A power steering pump replacement (PS pump replacement) can be done as a DIY job at home.
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