Last post on Oct 13, 2012 at 11:00 AM
You are in the Ford F-Series
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Ford F-150, Truck
#6 of 25 Re: 2011 F 150 Electric Power Steering Issues [temj12]
Jul 15, 2012 (9:58 am)
I have noticed that not just a few of the new EPS designs will go in "derated" mode, not "full" assist, if the power semiconductor devices begin to approach the point of overheating.
It sounds as if Ford may be using a slightly different technique to prevent EPS overheating, converting from a tightly closed-loop servo system, continuous, "finite" assist, to more of a "Bang-Bang" servo technique.
A "Bang-Bang" servo system will not provide power assist until the difference between the desired stearing position differs from the actual position by a specified, wider amount.
Porsche seems to think that an electro-hydraulic system is a better answer, a small electrically driven hydraulic pump.
#7 of 25 Re: 2011 F 150 Electric Power Steering Issues [wwest]
Jul 21, 2012 (4:00 pm)
They replaced part of the steering shaft. It did not fix the problem. They are doing the EPAS unit this week. Will keep you posted. The tech drove the truck after the steering shaft was replaced in the heat of the day and confirmed the problem. It was shaking the steering wheel and making the usual clunking noise. It is 100% heat related. We had a few cooler days with overcast skies and the truck drove perfectly on those days..........
#8 of 25 Re: 2011 F 150 Electric Power Steering Issues [brtruck]
Jul 23, 2012 (9:17 pm)
Thanks very much for the update. I have been watching this thread to see what they had to do.
#9 of 25 Electric power steering failure modes.
Jul 28, 2012 (12:14 pm)
Sorry to hi-jack this thread, but I urgently need information on Ford electric power steering failure modes.
2013 Escape FWD 2.0: Dramatic torque steer at launch, but more serious, at ~ 40 MPH WOT kickdown. Huge amount of correction required to keep the vehicle in one lane. I'm required to constantly input alternating left-right-left major corrections.
It also has very poor on-center feel.
1) Any suspected causes?
2) I like to find schematics of the control system ... where's a good place to look?
FWIW, One of my reference popints is my 2011 Ford Edge, which also has electric power steering, but negligible torque steer.
Both the Escape and Edge are claimed to have "Torque Steering Composition"
#10 of 25 Re: Electric power steering failure modes. [lateralg]
by KCRam@Edmunds HOST
Jul 28, 2012 (7:23 pm)
Likely not going to get much help here in the Pickups board for those crossovers. Us4e the "Browse by Vehicle" entries to the right to get to the Escape and Edge forums where you may get faster assistance.
kcram - Pickups/Wagons/Vans+Minivans Host
#11 of 25 Electric power steering failure modes
Jul 29, 2012 (5:16 am)
I've been to the Escape forum & will try the Edge forum.
My hopes here are for a technician, or other person with technical knowledge, who can provide me with guidance toward a source of diagnostics of Ford electrical power steering. Or schematics of the Ford electrical & electronic components in the system.
#12 of 25 Re: 2011 F 150 Electric Power Steering Issues [brtruck]
Aug 03, 2012 (11:31 am)
Have you made any headway on your epas problem? When you say shaking, is the
shaking a thing that you feel in the steering system through the steering wheel or is the steering wheel visibly shaking?
#13 of 25 Re: 2011 F 150 Electric Power Steering Issues [temj12]
Aug 03, 2012 (2:22 pm)
The truck has been at the dealer for a total of around 10 days (keep in mind it only has 900 miles on it). They have done three repairs so far: 1. changed intermediate steering shaft - did nothing. 2. Changed out the EPAS unit. 3. Lubed the entire steering shaft/system. They did the last two items at the same time. The result is that it is better, but not totally fixed. It makes the same clunking through the steering wheel, but not with such force. I do not know exactly how to describe it, but it almost feels like the steering pops down and then back up with a hallow feeling. If it was an older vehicle, I would say it feels like a bad ball joint, but it does not happen only when I hit bumps and is heat related as mentioned before. It is totally random. The people I am dealing with here have been great, but do not know what to do. They have confirmed the issue, but are now waiting for me to meet with the regional engineer next week. Unfortunately, I am afraid the truck will make a liar out of me when we drive it. I am going to look for a way out of the truck as it has already taken up way too much of my time. Too bad, because otherwise I really like it.
#14 of 25 Re: 2011 F 150 Electric Power Steering Issues [brtruck]
Aug 04, 2012 (9:46 am)
Yaw sensor is loose (internally?) or needs to be replaced.
#15 of 25 Re: 2011 F 150 Electric Power Steering Issues [wwest]
Aug 04, 2012 (9:56 am)
Where is the sensor located? What does it look like? What does it sense ... what components send it signals?