Power steering?



Power steering?

Postby chaparral2f » August 29th, 2014, 3:09 pm

Sorry I have no idea where to post this so here I am. I decided not to use hydraulic power steering so in my infinite wisdom I bought the electric system from a Chevy Cobalt. In the time since I've looked everywhere I can think of for a wiring diagram to install it, including joining every Cobalt forum I can find, Googling for days on end and even going to the Chevy dealership and begging for help. The service dept is just like a parts store (clueless). So I know you like challenges, I've come to ask if you have any ideas on how to wire this thing in. BTW, I don't know anything about electronics.
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Re: Power steering?

Postby Indycars » August 29th, 2014, 3:22 pm


You didn't saw what year so I used 2010.

Cobalt2010Steering.JPG


Power Steering System Description and Operation

The electric power steering (EPS) system reduces the amount of effort needed to steer the vehicle. The system uses the body control module (BCM), power steering control module (PSCM), torque sensor, discrete battery voltage supply circuit, EPS motor, serial data bus, and the instrument panel cluster (IPC) message center to perform the system functions. The PSCM, torque sensor, not the EPS motor are serviced separately from each other or from the steering column. Any EPS components diagnosed to be malfunctioning requires replacement of the steering column assembly, also known as the EPS assembly.

Torque Sensor

The PSCM uses a torque sensor as it's main input for determining the amount of steering assist. The steering column has an input shaft, from the steering wheel to the torque sensor, and an output shaft, from the torque sensor to the steering shaft coupler. The input and output shafts are separated by a torsion bar, where the torque sensor is located. The sensor consists of a compensation coil, detecting coil and 3 detecting rings. These detecting rings have toothed edges that face each other. Detecting ring 1 is fixed to the output shaft, detecting rings 2 and 3 are fixed top the input shaft. The detecting coil is positioned around the toothed edges of detecting rings 1 and 2. As torque is applied to the steering column shaft the alignment of the teeth between detecting rings 1 and 2 changes, which causes the detecting coil signal voltage to change. The PSCM recognizes this change in signal voltage as steering column shaft torque. The compensation coil is used to compensate for changes in electrical circuit impedance due to circuit temperature changes from the electrical current and voltage levels as well as ambient temperatures for accurate torque detection.

EPS Motor

The EPS motor is a 12-volt brushed DC reversible motor with a 58-amp rating. The motor assists steering through a worm shaft and reduction gear located in the steering column housing.

Power Steering Control Module (PSCM)

The PSCM uses a combination of torque sensor inputs, vehicle speed, calculated system temperature and the steering calibration to determine the amount of steering assist. When the steering wheel is turned, the PSCM uses signal voltage from the torque sensor to detect the amount of torque being applied to the steering column shaft and the amount of current to command to the EPS motor. The PSCM receives serial data from the engine control module (ECM) to determine vehicle speed. At low speeds more assist is provided for easy turning during parking maneuvers. At high speeds, less assist is provided for improved road feel and directional stability. The PSCM nor the EPS motor are designed to handle 58 amps continuously. The PSCM will go into overload protection mode to avoid system thermal damage. In this mode the PSCM will limit the amount of current commanded to the EPS motor which reduces steering assist levels. The PSCM also chooses which steering calibration to use when the ignition is turned ON, based on the production map number stored in the BCM. The PSCM contains all 8 of the steering calibrations which are different in relation to the vehicles RPOs. The PSCM has the ability to detect malfunctions within the EPS system. Any malfunction detected will cause the IPC message center to display PWR STR (or Power Steering) warning message.

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Re: Power steering?

Postby Indycars » August 29th, 2014, 3:39 pm


More info.


Cobalt2010SteeringControlModuleX2.JPG

Cobalt2010SteeringControlModuleX3.JPG
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- Need a Dynamic Compression Ratio Calculator: viewtopic.php?f=99&t=4458
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Re: Power steering?

Postby chaparral2f » August 29th, 2014, 5:23 pm

Thanks, now I'll need a few days to digest this info and try to decide which inputs I can do without, since my car doesn't have an electronic speed sensor or any kind of ECU.
So anything else you might want to suggest will be better than fine with me.
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Re: Power steering?

Postby Indycars » August 29th, 2014, 5:40 pm


I wish I new as much about it as it might seem from my post, but if you have
looked at the information, then you already know more than I. :)

If you come across something that should have more info, then just ask and I
will see if I can locate it. I have access to the GM Fleet website and might be
able to locate it.

There is another Module X1, it's a 2 pin connector. The website requires
Qucktime to be installed, but I didn't want to do that at work. I can do it
on another computer if becomes important, just let me know.

Rick
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- Check Out My Dart SHP Engine Project: viewtopic.php?f=69&t=3814
- Need a Dynamic Compression Ratio Calculator: viewtopic.php?f=99&t=4458
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Re: Power steering?

Postby 87vette81big » August 29th, 2014, 6:39 pm

What kind of car or toy are You building ?
To my knowledge its never been done.
Even on an old Corvette.
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Re: Power steering?

Postby 87vette81big » August 29th, 2014, 7:37 pm

If You have a Chaparral that would explain the ISKY 253 @.050" Race Cam & VERTEX OAX Magneto 6 amps Primary Current output.

There was a L-88 Chaparral in my area years ago.
Raced the Midwest.
My late bud Bill turned wrenches on it.
Several of the L88 Builds by him .
Recall many Race Stories from him.
Fast ......And Faster near 200 mph.
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Re: Power steering?

Postby chaparral2f » August 30th, 2014, 2:08 pm

I 'm not really sure what it is, nobody really wants to claim it :)
The body is a '84 Nissan 300zx
The chassis is 4130 moly aircraft tubing.
Front suspension is Jaguar xj6
Rear end is also Jag xj12 (Dana 44 IRS)
The engine is 355 sbc (setback 4")
Trans is 350th
My screen name is after Jim Hall's Chaparral race car that has fascinated me forever.
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Re: Power steering?

Postby 87vette81big » August 30th, 2014, 3:33 pm

chaparral2f wrote:I 'm not really sure what it is, nobody really wants to claim it :)
The body is a '84 Nissan 300zx
The chassis is 4130 moly aircraft tubing.
Front suspension is Jaguar xj6
Rear end is also Jag xj12 (Dana 44 IRS)
The engine is 355 sbc (setback 4")
Trans is 350th
My screen name is after Jim Hall's Chaparral race car that has fascinated me forever.

Hello.
Your a Krazy Hotrodder & Street Racer like Phil & Me & others here then.

The Jag Dana 44 is pretty rare.
Read about them. Never seen one up close in person.
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Re: Power steering?

Postby chaparral2f » August 31st, 2014, 7:09 pm

When I got i thought it was a Salisbury [?] but was really happy when I found it was a Dana with posi.
jag dana raw 2.jpg
cover removed 1.JPG
jag dana rear on jig.jpg
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Re: Power steering?

Postby grumpyvette » September 1st, 2014, 8:00 am

thats a rather rare, to find , but very much sought after rear for guys building T-buckets like rick has
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
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Re: Power steering?

Postby chaparral2f » October 22nd, 2014, 2:22 pm

I think the steering is finally straightened out. I did a lot of research and studied the material posted here, (Thanks Indycars) and finally reached the conclusion that it couldn't be done. So I bought the steering column out of a 2003 Saturn Vue and a controller for it off E-bay. Now as soon as the control gets here I should have that part of this project under control. Whoopie!!!
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Re: Power steering?

Postby 87vette81big » October 22nd, 2014, 4:05 pm

That's a Real Early Dana 44 Trac Lock Posi unit assembly with 4-pinion spider gears to transfer torque to each side gear and then to Stub output shafts.
About 1966-67 Vintage I do believe.
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