All Wheel Drive Failure

[roadhammer]

The rear wheel drive in my wife's MKS Twin Turbo AWD just failed, they replaced the haldex and the PTU, the Ford field engineer claims this is the FIRST failure of this kind in the whole country, including MKS, Flex, and SHO.
My question is , who else has had this problem?

 

[way2evil]

This isn't the first failure. I'm not sure who else had it but I remember someone posting a video of a sho in the snow spinning the fronts like crazy.

 

[EcoBrick Bob]

Tech Addiction had PTU issues with his new EB Flex, as have others on Flex Forum. No Haldex issues that I'm aware of though. Perhaps he will respond.

 

[TRBOSHO]

The rear wheel drive in my wife's MKS Twin Turbo AWD just failed, they replaced the haldex and the PTU, the Ford field engineer claims this is the FIRST failure of this kind in the whole country, including MKS, Flex, and SHO.
My question is , who else has had this problem?

Look Here:

http://www.shoforum.com/showthread.php?t=107712

 

[yamahaSHO]

I think there are videos on youtube about the supposed AWD on these cars. Definitely not the first failure. That should tell you how to deal with him next and what BS to expect from him.

I guess people don't realize that the Internet IS where information is passed these days?

 

[SolidState]

IIRC, the PTU and Haldex system is similar to the 2008+ Taurus/Taurus X and there have been a few of those fail...

 

[roadhammer]

have driven my wife's MKS Ecoboost about 1200 miles since the PTU and rear end have been replaced, so far so good...

 

[typhoon5000]

FYI, Ford stopped using the Haldex AWD system around 2009 when they switched to the new D cars, Flex/New Taurus (compared to Fivehundred/Freestyle) and is now an in house design assembled by ZF, but the rear clutchpack coupling that engages the rear diff is made by Japanese supplier JTEKT.

http://www.flickr.com/photos/24619344@N06/3547724924

 

[wchain]

http://www.shoforum.com/showthread.php?t=107563

 

[typhoon5000]

http://www.shoforum.com/showthread.php?t=107563

Yep, I know. I was wrong when I posted that because I didn't know then. If you look, I corrected myself at the end of that thread. I now know for a fact that the 2010 Taurus and other D cars don't have a Haldex system.

The media assumed it was a carryover Haldex system from the Ford 500 and Freestyle which had Haldex systems, from sharing the platform and a lot of components with Volvo, but when the Taurus was reintroduced with the other D cars with the 3.5L, it went to an in-house design with ZF and JTEKT components.

 

[BamaRon]

I also have a 2010 SHO with the AWD not working properly. The car was produced in early Nov 2009 and I received it around Thanksgiving of last year. The AWD worked great when I first got the car, taking off at WOT with no wheel spin. Then sometime around March of this year something changed and at WOT the tires would break free at about 1200 to 1500 RPM in first gear and burn rubber as long as I held the throttle down. At this time it was very apparent that the car was 100% front wheel drive.

I took the car into my dealership in April. They checked it out and said it was fine!!!
Yesterday I took the car in again along with examples of other ecoboost AWD problems similar to mine. The Service Manager decided to take another look. He also admitted that mine was the only SHO they had seen in their service area.

This time they gave the work order to a young machanic who had just started working for Ford a few months earlier, but had several years of work experience for Audi on AWD vehicles.

When he test drove the car, his first reply when he returned was "YOU DON'T HAVE ANY AWD WORKING ON THIS CAR" He then spent 2-3 hours checking out all the components of the AWD system and said that the differental assembly unit was not working (this also includes the clutchpack coupling assembly attached to the front of the differential.

I asked him if he was sure that the PTU was working properly since other cars have had the PTU and differential assemblies replaced in order to get the AWD system working properly. He said that my PTU was sending the proper electronic signal to the differential assembly, but that the differential was not responding.

So I have a new differential assembly unit on order. They stated that this differential assembly unit does not currently have a part number for Ford, but they were able to place the order somehow and not notified of any backorder.

Therefore I am hoping that I can see if this is the cure for my car by sometime next week.

BamaRon

 

[BamaRon]

I got the differential assembly unit replaced at my dealership this past week and they said the AWD was now working when they gave it to me. When I drove it, the front wheels still had a severe tire spin at WOT. They said that was normal because the traction control was coming on now when it spins! BS!!!! The traction control is not suppost to control wheel spin when you take off, the AWD is suppost to compensate. This car never had wheel spin at WOT the first four months I had the car. This is my second trip to the dealer starting in April. Still no fix. What is needed to have a claim under the lemon law? I didn't buy a $44,000 car to have it not operate as advertised. When I have to pull out in traffic and accelerate quickly, I now have the problem of wheel spin and loss of adequate steering, since my drive wheels (all front wheel drive) are slipping and can not safely steer when I pull into traffic. Well, back to the dealership again Monday!

BamaRon

 

[luigisho]

Is there another dealer close by? Even if so, you may have to go further up the food chain to get it what you need.

 

[gaggej]

SHO no AWD

2010 SHO and it seems very similar to what I see here.

AWD worked fine new and now I'm FWD only. Full throttle at take off means full wheel spin and full TSC. Turn off TSC and it just spins forever. Dry pavement - tires will break loose but torque on steering wheel is massive, and unlike ever before.

In the past, rear would engage and car would rocket off the line.

Took to dealer and they claim all is well. Put it on a lift and 3 of 4 wheels spin while in drive and they claim no codes in the system which means no issues. Blaming it on Goodyear Eagle tires being too high performance for cold weather driving.

Need some help, especially in winter now.

Any ideas on troubleshooting or how to get the dealer to "see" this issue?

 

[somedude_001]

tell them to launch the car and observe massive tire spin from the front tires. In theory the pto clutch might be slipping badly but when there is no load on the rear wheels (car in the air) the clutch might be grabbing just enough to make the rear wheels spin.

 

[Crash712us]

In TSB stickies it describle how to test the system. But long and short of it, the drive shaft always is suppose to turn, in front of rear diff there a electromagnetic clutch. This controls the engagement of rear wheels.
The test is with car on hoist see if drive shaft and be turn by hand, it shouldn't. Next run car in drive, drive shaft should be turning engage emergency brake rear wheels should stop but drive shaft should continue to turn.
Stepping on E-brake disengage rear dif electronic coupling.
As to 3 of 4 wheels turning drag from brakes could be preventing from spinning freely and doesn't necessarily mean there is problem.
But putting you foot on spinning tire to slow or stop should cause the opposite tire to turn now. Please use caution when doing this, as this could be very dangerous for obvious reasons. But at idle in gear I have slowed or stopped wheel from spinning with my foot to force the other to spin. Now if it doesn't then rear dif is definitely bad.

 

[Killian O'Brien]

Help! I just bought a front wheel drive SHO!(2010) If anyone could give a list of possible causes for the absence of all wheel drive that would be greatly appreciated. much that i needed was stated above but i would like to do as much as possible before a ford tech hooks it up to a computer and tells me it's fine(it's not). Also if there's anyone who has had this problem out of warranty and had to do repairs themselves on the AWD system i'd love to any part numbers, symptoms, and stories that they've obtained!

 

[Crash712us]

Help! I just bought a front wheel drive SHO!(2010) If anyone could give a list of possible causes for the absence of all wheel drive that would be greatly appreciated. much that i needed was stated above but i would like to do as much as possible before a ford tech hooks it up to a computer and tells me it's fine(it's not). Also if there's anyone who has had this problem out of warranty and had to do repairs themselves on the AWD system i'd love to any part numbers, symptoms, and stories that they've obtained!

PTU is the most common failure. And believe in this thread it is explained how to test the AWD system. Only other thing I've seen disable the AWD system is dissimilar tire sizes, such as having the spare on the car.

 

[SHOdded]

Maybe someone pulled the fuse?

 

[glockcoma]

Awd control control module- AG1Z*7E453*AA
http://www.tascaparts.com/ford/taur.../transfer-case-scat/?part_name=control-module

PTU-AT4Z*7251*D
http://www.tascaparts.com/oe-ford/at4z7251d