Electronic Power Steering Assist

Shawn Diagnostician Springfield, Oregon Posted   Latest  
Resolved
Chassis
2012 Ford Fiesta S 1.6L (TiVCT) 6-spd — 3FADP4BJ9CM115682
Poor Steering

Vehicle came to shop for struts. Installed struts and test drove vehicle. All was well for vehicle to go to alignment shop. Picked up vehicle after alignment and now if you let go of steering wheel the vehicle will go to the right,steering wheel will go to full stop on its own. Takes much effort to turn left. scanned for codes and shows U3002:62 which my data base said is a VIN issue and signal compare failure. Scan data pids look normal. Performed a steering wheel sensor calibration and also a PDC reset. still same issue. Suspect a bad PSCM but want to make sure i am not missing something​.​Has anyone seen anything like this before. Any help in a direction is appreciated. Thank you.

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Domenic Owner/Technician
Great Barraington, Massachusetts
Domenic Default
 

Wondering if the upper mounts are indexed correctly. meaning if the the top mount is one that the shock isn’t centered in it needs to be located correctly on the 3 holes into the strut tower. ive seen one like that on a bmw and it was missed by the dealer! Only think I can think of that would have that drastic a change unless it’s hydraulic and in the rack like you’re possibly asking.

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Shawn Diagnostician
Springfield, Oregon
Shawn Default
 

Domenic thanks. I will check the index.

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Allan Owner
Sterling, Virginia
Allan Default
 

Torque sensor in steering or column is my guess. I’ve seen a column fix an escape with similar issue

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Justin Mobile Technician
Herriman, Utah
Justin Default
 

I agree calibrate the torque sensor. I have also seen the column needing to be replaced to fix this. The ones I have seen when you start the vehicle up the steering wheel will spin to the right fairly violently. They also take significant effort to get them to turn to the left. This is in park not moving. I don’t think an alignment will cause this.

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Shawn Diagnostician
Springfield, Oregon
Shawn Default
   

Justin that is exactly what happens here. Im wondering if Jason may be on to something with forcing the steering wheel against the turn stop. Your thoughts?

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Laird Owner/Technician
Waverley, Nova Scotia
Laird Default
 

If this is an electric power steering system, pull the fuses to disable it and drive it. If the pull is still there then it is an alignment issue. If it is gone you know its electric

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Shawn Diagnostician
Springfield, Oregon
Shawn Default
 

Thank you Laird. I actually did that. Im confident it is electrical. Wondering if this is just bad timing or if the alignment was not performed as OE procedure.

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Keith Diagnostician
Collinsville, Oklahoma
Keith Default
 

Was the alignment completed according to OE service procedures?

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Shawn Diagnostician
Springfield, Oregon
Shawn Default
 

Keith im not sure but i am going to investigate that issue since the steering was fine until alignment.

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Keith Diagnostician
Collinsville, Oklahoma
Keith Default
 

My question was really alluding to the steering angle sensor relearn that MUST be performed. If you are subletting alignments, its imperative to use a place that follows OE procedures.... think of all the lost profit in man hours this single instance has created if it's as simple as them not completing the alignment by performing the reset, or some other process that's in the OE service info.

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Agree
Helpful
Shawn Diagnostician
Springfield, Oregon
Shawn Default
 

I agree. I myself performed the steering angle sensor thinking the alignment shop missed that.

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Nicholas Diagnostician
Brooklyn, New York
Nicholas Default
   

I see you already performed the steering sensor calibration, Is the steering angle sensor working correctly? If it is I would agree it is more than likely a problem with the PSCM. Maybe you should try a reflash first incase the software is corrupt, before you replace PSCM.

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Shawn Diagnostician
Springfield, Oregon
Shawn Default
 

Nicholas the steering angle sensor appears to be working fine per scan data. data shows proper angle movement. Thanks for the reply.

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Jason Technician
Ronkonkoma, New York
Jason Default
   

Comon technique to fine tine steering wheel center after the machine does it's thing is to turn the wheel to lock, and then force it further, somewhat twisting the steering shaft. If you do this on an EPS car is borks the torque sensor.

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Shawn Diagnostician
Springfield, Oregon
Shawn Default
 

Jason i find this interesting. So if the steering wheel is forced to the turn stop it will damage the torque sensor? It would appear that this system has a torque angle sensor as well as a steering wheel position sensor or are they the same sensor. I will look at the wiring diag. to see. Thank you.

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Marlin Technician
Estacada, Oregon
Marlin Default
 

Wow, I never heard of doing that! That is simply stupid. Thanks for the warning, I will keep it in mind. I guess there is a benefit to many of alignments guys around here not caring about centering the steering wheel!

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Mike Technician
Atlanta, Georgia
Mike Default
 

Absolutely no reason at all to do that. I did thousands of alignments at my last shop, as I was the designated alignment tech. Not one single one needed that done. There is no "fine tuning". It may be common but it's wrong.

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Glen Owner/Technician
Arthur, Illinois
Glen Default
   

Based on the Code suspect PSCM programing corrupt. WSM make no mention of steering angle re-calibration after an alingment

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Shawn Diagnostician
Springfield, Oregon
Shawn Resolution
 

Problem solved. Internal to the PSCM is the steering wheel angle sensor which was broken (per dealership) and the only fix is a new PSCM. The strange thing is that i had no code for the angle sensor and scan data showed movement. Im wondering if the values i saw on scan data were substituted by PSCM. Steering did NOT go into fail safe mode which data base said it will when angle sensor fails…

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Caleb Diagnostician
Mishawaka, Indiana
Caleb Default
 

Did the car also have a steering angle sensor module in the column. If so this could have been were your data was coming from.

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Shawn Diagnostician
Springfield, Oregon
Shawn Default
 

yes it does. Per dealer the sensor was broken. Was told it is a clockspring type sensor. Im verifying this when said vehicle is returned with the old parts.

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