controller problems - Page 2 - Fiberglass RV


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 12-12-2007, 03:22 PM   #15
Junior Member
 
Trailer: 17 ft Bigfoot
Posts: 9

Jerry thanks for your input. I have gotten some help over the phone today, so not a bad idea.

Brian, I just spotted your post. I copied all the posts including yours and emailed them to my mechanic, I also filled him in on this GREAT site.

Brian's last sentence said to not go near a GMC service center, which I agree with. I emailed my mechanic, Scott, a Dunwoody grad, and asked if he wouldn't look closely at Brians ( and all the other ) post (s). Scott has wired up all my trailers, bucket trucks, cars, and SUV's and I expect to make some real progress tomorrow once he has slept on all he will be reading.

Brian also made the comment that he wasn't surprised by the somewhat changed behavior of the Yukon once the second controller was installed and he painted this picture of a worker, happily making the same mistake a second time, and this makes me feel that with all of you peoples help I just might get out of this mess after all.

Thanks Brian for that detailed response and thanks again to all.

Rodney
__________________

__________________
Rodney Robinson is offline   Reply With Quote
Old 12-12-2007, 03:27 PM   #16
Senior Member
 
Bigfoot Mike's Avatar
 
Name: Mike
Trailer: Bigfoot 25 ft
Posts: 7,317
Quote:
If you run out of options as to the solution to your problems I would give Uhaul a call they are pretty helpful. At least when I ran into problems They were most informative.
Good luck Jerry.
Rodney started at Bauer’s, his local U-Haul Franchise.

He wrote:
<blockquote>“Taking it back to Bauers is not an option.”
</blockquote>
__________________

__________________
Bigfoot Mike is offline   Reply With Quote
Old 12-12-2007, 08:02 PM   #17
Senior Member
 
Brian B-P's Avatar
 
Name: Brian
Trailer: Boler (B1700RGH) 1979
Alberta
Posts: 5,000
I didn't realize that Bauer's is a U-Haul franchise, but the conflict between this experience and positive recommendations for U-Haul doesn't surprise me at all: as franchises, they can be quite inconsistent. No matter what the U-Haul company knows about towing, the person at the franchise could have any level of knowledge or skill.

Quote:
...I made some progress by talking to Paul at Prodigy tech support. He immediately identified the noise as ABS (automatic brake system) related. Also he connected the dots as to my wheel sensor and brakes pushing back and vehicle not stopping (without trailer). He said the Prodigy uses infromation from that sensor and so if the sensor has problems, maybe the Prodigy will not perform as planned.
I'm not sure that Paul's assessment made it through entirely clearly. The only information from the tow vehicle which is used by the Prodigy is a simple on/off indication of whether the brakes are being applied - which is intended to be from the brake light circuit - and the controller's use of this signal should not affect the tow vehicle.
  • No matter what a wheel speed sensor is doing, or how the ABS is responding, this signal should be "on" continuously whenever the Yukon's brake pedal is pushed down.
  • No matter what the Prodigy (or other controller) does, the ABS should not be affected by it.

Vehicle stability control systems (and even some distance-measuring cruise controls), which may apply the brakes even when the driver is not touching the pedal, make the "[b]are we really braking" question more complex, so with those features it is even more important to get the right wire. I don't have either of those in my tug.

Maybe I should have mentioned this earlier, but the [b]brake pedal pushing back is an expected result of the ABS relieving hydraulic pressure to the vehicle's brakes, and pushing the pedal back up to make up for the lost fluid - otherwise as the ABS took action the brake pedal would work its way to the floor. As a fortunate side effect, it makes the driver aware that the ABS is taking action.
__________________
1979 Boler B1700RGH, pulled by 2004 Toyota Sienna LE 2WD
Information is good. Lack of information is not so good, but misinformation is much worse. Check facts, and apply common sense liberally.
STATUS: No longer active in forum.
Brian B-P is offline   Reply With Quote
Old 12-13-2007, 03:13 PM   #18
Junior Member
 
Trailer: 17 ft Bigfoot
Posts: 9

Was busy last night and we were gone fron this morning until now.

I can't believe it. We just used the Yukon for quite a few miles this morning and THERE ARE NO MORE SYMPTOMS AT ALL.

The ABS light is out. No scrapping noise. No buzzing noise and no brake pedal pushing back. Nothing. Yukon drives and acts like it

usually did before the controller installation.

With all the input and help I recieved here I feel obligated to come to some king of cure or resolution.

No one unplugged the latest controller, and Scott didn't come over and find a cure early this A M.

So to recap, I had all the negative symptoms for the last two or three or more days. Even with the changing out of controllers the

symptoms were still there. Today from the first there were no negative symptoms at all. Which is so so strange.

The only thing that happened was that yesterday was warmer than a number of previous days. That is the only thing that is different.

I have been telling everyone I have come into contact lately about this site and all the constructive help I recieved here.

I will continue to "test drive" the Yukon to see if any of the symptoms return.

In the meantime many thanks again for all the responses and all the effort everyone contributed.

If it ever comes to light, what it was that was causing all my problems, I will stop back here and give a full report.

I guess the best I can do for now to repay all of you is to "pay it forward" when ever I can.


Thank You

Rodney

__________________
Rodney Robinson is offline   Reply With Quote
Old 12-13-2007, 03:40 PM   #19
Senior Member
 
Byron Kinnaman's Avatar
 
Name: Byron
Trailer: 2006 Scamp 13' towed with a 2005 Dodge Dakota 4.7l Magnum W/full tow package (over kill)
Oregon
Posts: 6,308
Registry
One wonders if your brakes will still go into ABS. You might want to try to lock up the brakes on a gravel or dirt road.
__________________
Byron & Anne enjoying the everyday Saturday thing.
Byron Kinnaman is offline   Reply With Quote
Old 12-13-2007, 05:04 PM   #20
Senior Member
 
Brian B-P's Avatar
 
Name: Brian
Trailer: Boler (B1700RGH) 1979
Alberta
Posts: 5,000
Scott (the trusted mechanic) probably has an On Board Diagnostics (OBD) code reader. Plugging that into the Yukon will show any stored diagnostic codes for the limited set of conditions which are covered by the OBD system; there are standard trouble codes, plus more specific to the manufacturer which are readily available for GM. One nice feature of OBD is that codes can be stored even after the problem conditions goes away, so there might be an informative indication still available.

Cars don't heal, but sometimes car computers work around problems, so it seems like the problem isn't there anymore. Like Byron, I would be a little concerned that there might still be an issue, even though there are no longer outward signs.

By the way, we don't need gravel or dirt to test ABS around here in this season; my whole drive to work is a demonstration of computerized traction control, and I can exceed available braking traction and trigger ABS at will for a significant part of that.
__________________
1979 Boler B1700RGH, pulled by 2004 Toyota Sienna LE 2WD
Information is good. Lack of information is not so good, but misinformation is much worse. Check facts, and apply common sense liberally.
STATUS: No longer active in forum.
Brian B-P is offline   Reply With Quote
Old 12-13-2007, 05:19 PM   #21
Senior Member
 
Byron Kinnaman's Avatar
 
Name: Byron
Trailer: 2006 Scamp 13' towed with a 2005 Dodge Dakota 4.7l Magnum W/full tow package (over kill)
Oregon
Posts: 6,308
Registry
Quote:
Scott (the trusted mechanic) probably has an On Board Diagnostics (OBD) code reader. Plugging that into the Yukon will show any stored diagnostic codes for the limited set of conditions which are covered by the OBD system; there are standard trouble codes, plus more specific to the manufacturer which are readily available for GM. One nice feature of OBD is that codes can be stored even after the problem conditions goes away, so there might be an informative indication still available.

Cars don't heal, but sometimes car computers work around problems, so it seems like the problem isn't there anymore. Like Byron, I would be a little concerned that there might still be an issue, even though there are no longer outward signs.

By the way, we don't need gravel or dirt to test ABS around here in this season; my whole drive to work is a demonstration of computerized traction control, and I can exceed available braking traction and trigger ABS at will for a significant part of that.
Ya, I kinda forgot that some of you are in real winter.
From what I read in news Rodney probably won't have any problems finding a place to activate ABS.

By the way I don't know how an on board computer can work around problems except to shut down systems that have problems, where shutting down a system is safer than leaving a defective system active.

__________________
Byron & Anne enjoying the everyday Saturday thing.
Byron Kinnaman is offline   Reply With Quote
Old 12-13-2007, 05:21 PM   #22
Senior Member
 
DanPatWork's Avatar
 
Trailer: 88 Scamp 16 ft
Posts: 191
Registry
If the previous diagnosis of a bad wheel speed sensor (also hub bearing in your case) was correct, it's possible that the sensor is acting intermittently and is not causing a hard fault right now. This may be explained by the change in temps that your experienceing. I recommend getting the codes checked, and verify the fault is within the sensor before chasing after a faulty brake controller at this point. Wheel bearings with the sensor built in can be a bear sometimes, and they are not the cheapest thing to replace on the car either. Good luck.
__________________
DanPatWork is offline   Reply With Quote
Old 12-13-2007, 06:19 PM   #23
Senior Member
 
Brian B-P's Avatar
 
Name: Brian
Trailer: Boler (B1700RGH) 1979
Alberta
Posts: 5,000
Quote:
By the way I don't know how an on board computer can work around problems except to shut down systems that have problems, where shutting down a system is safer than leaving a defective system active.
Yes, that's basically it. For example, fuel injection systems with mass air flow sensors may respond to an airflow sensor failure by ignoring it, and using more crude speed and air density method. With a wheel speed sensor I can't imagine a workaround which would not lose functionality and justify keeping the trouble light on; for instance, ABS could ignore that wheel and only work to relieve lockup on the other three... but that means one wheel potentially locking up, a significant loss of functionality.

The possibility of an intermittent fault seems more likely, and thus the value of error codes.

The connection with the controller just seems like way too much of a coincidence to me. I wonder if there is an intermittent connection in the controller wiring, rather than an intermittent fault in an actual sensor? On the other hand, unwanted ABS action does seem consistent with a wheel speed signal saying the wheel has locked up, when it really hasn't. Maybe a sensor is intermittently faulty, and the brake controller makes it seem like the brakes are being applied so the problem becomes apparent - that would be both a controller installation problem and a real sensor problem!
__________________
1979 Boler B1700RGH, pulled by 2004 Toyota Sienna LE 2WD
Information is good. Lack of information is not so good, but misinformation is much worse. Check facts, and apply common sense liberally.
STATUS: No longer active in forum.
Brian B-P is offline   Reply With Quote
Old 12-14-2007, 07:09 AM   #24
Senior Member
 
Joe MacDonald's Avatar
 
Trailer: Trillium
Ontario
Posts: 754
GM sensors are notorious for failing, My 2 Lumina's have required all front units to be changed several times. the bearing itself has never failed, but the sensors require a bearing changeout. I have never had my brakes react with pulsing other than at startup when the system does a self diagnostic. and yes, on mine temperature change and humidity can make it come and go.
Joe
__________________
Joe MacDonald is offline   Reply With Quote
Old 12-14-2007, 09:02 AM   #25
Senior Member
 
Alf S.'s Avatar
 
Name: Alfred
Trailer: 2014 Escape 5.0TA / 2010 Nissan Frontier
Ontario
Posts: 3,816
Registry
Send a message via Yahoo to Alf S.
Hi: There really is a ... and ELVES too!!!
Alf S. North shore of Lake Erie
__________________

__________________
Alf S. is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
pad problems Pamela H Problem Solving | Owners Helping Owners 5 03-25-2009 03:50 PM
More problems Anne H Forum Admin, News & Announcements 19 12-06-2007 08:30 PM
New Controller jrnutpaul Problem Solving | Owners Helping Owners 2 05-25-2006 01:54 AM

» Upcoming Events
No events scheduled in
the next 465 days.
» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 03:19 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.