It is currently Thu Mar 28, 2024 4:08 am

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 8 posts ] 
Author Message
PostPosted: Wed Aug 01, 2018 9:05 am 
Offline
SSE Member
SSE Member

Joined: Wed Apr 15, 2015 8:39 am
Posts: 102
Location: Ira, MI
Year and Trim: 2001 Bonneville
Hello,
Earlier this year I had the issue with the Trac off/ABS lights illuminating on the dash. More a nuisance than anything. I discovered that it was a bad connector at passenger front wheel bearing. Easy fix.

Well, its happening again, only a bit different.

My scanner says a failure or open circuit at Front Left (Drivers side I assume). I hooked up my ohm meter to the wheel bearing connector and it read resistance. Then I spun the rotor and resistance changed. This tells me the bearing connector is OK.

I replaced the connector anyway to eliminate possible issues.

I can disconnect the connector at the wheel bearing, plug it back in, start the car and NO warning lights.
The second I put the car in gear from Park to Drive or reverse, the warning lights come on. This is very repeatable. I can drive to work with the warning lights on; turn the key off; start the car again and NO warning lights. The second I put it in gear the warning lights come on.

Any clues?


Top
 Profile  
 
PostPosted: Wed May 08, 2019 9:57 am 
Offline
SLE Member
SLE Member

Joined: Wed Mar 12, 2014 1:51 pm
Posts: 46
Year and Trim: 2001 SE
Did you ever find a solution to this issue? I just changed my hubs, yesterday, and am having the same exact problem. No lights until I shift to either 'drive' or 'reverse' from 'park', and then they come on.

_________________
J.


Top
 Profile  
 
PostPosted: Wed May 08, 2019 4:42 pm 
Offline
Posts like a Northstar
Posts like a Northstar

Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1813
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
it could be that the system only engages in drive gears.

did you check the wires to the plug on bearing - see if you get good continuity.

_________________
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am


Top
 Profile  
 
PostPosted: Wed May 08, 2019 7:00 pm 
Offline
Resident Gearhead
Resident Gearhead

Joined: Wed Apr 01, 2009 7:11 pm
Posts: 2594
Location: Alberta, Canada
Year and Trim: 2004 GXP, 2008 STS, 2020 XT6
I assume you replaced the hub(s) with new? Lots of people get them at the wrecker and since it's not an uncommon problem with these cars, used may be no better than the original. If they are new, I'd be looking at wiring first (just because it's cheaper than starting with component replacement, and should be checked anyway), then the possibility of a fault with the EBCM. If I'm not mistaken, they have been known to develop bad connections internally resulting in these same failures.

Measuring the hub with an ohm meter really isn't the best test since a short in the coil will still suggest it's intact. You should spin it and measure it with an AC volt meter. Photobucket isn't being very helpful in linking the video I made a few years ago. I know Andrew posted it a while back somewhere on the forum, just can't remember where. Anyway, I used a drill to spin a hub and measured about 750mv. This can vary up and down depending on the speed the hub is turning at.

The following is really when a fault is detected in one of the rear wheel speed sensors, however it'll probably just be a matter of time before you're looking at this as well..

There is a connector under the rear driver's side of the vehicle that connects the rear wheel speed sensor wiring harness to the main body harness. There have been several instances reported of water intrusion into this space. In some cases there are only corroded terminals, but there have been multiple cases where moisture has wicked into the main body harness so far that wiring had to be replaced as far as a couple of feet in. When this happens, it's also likely that the wheel speed sensor wiring harness needs to be repaired or replaced. I always recommend checking this connector for the problem reported here. Since it's outside the vehicle, it's critically important to ensure it's very clean and dry before separating it, then making sure no dust or other debris contaminates the seal or mating surfaces when it's reassembled. These are weatherproof connectors, but with the location, age and heat, care is necessary to ensure they aren't compromised any further.

Of course, DTC's are always very helpful!

_________________
Image

Bose Luxury Sound System w/Touch Screen Navigation, Addition of Factory XM, 2005 MY Antenna, OnStar Upgrade (3G),
RainSense Wipers, Backup Camera, '00 Style Door Panel Courtesy Lights, Heated Washer Solvent, 2X Remote Trunk Release,
Turn Signal Mirrors, Center Console Courtesy Lamp, Rear Outboard Heated Seats, PVD Chrome 18" Factory Rims, Upgraded
Carbon Fibre Appearance Interior Trim, Highly Modified Main Body Harness, Instrument Panel, Door, Door Panel & Headliner
Wiring Harnesses, Custom Fuse Box & Tire and Loading Information Decals, Additional Acoustic Insulation


Top
 Profile  
 
PostPosted: Thu May 09, 2019 7:27 am 
Offline
SLE Member
SLE Member

Joined: Wed Mar 12, 2014 1:51 pm
Posts: 46
Year and Trim: 2001 SE
96 SSEi wrote:
it could be that the system only engages in drive gears.

did you check the wires to the plug on bearing - see if you get good continuity.




Yes, I gave a quick inspection and did not see any issues prior to installing the new hubs. There were no idiot lights on the dash before I did the job and I was extremely careful with them during the process of changing old to new. I guess it is a possibility that something happened to these 19yr pigtails. How do I check for continuity? Ohmmeter on each terminal of pigtail coming from car?

_________________
J.


Top
 Profile  
 
PostPosted: Thu May 09, 2019 7:34 am 
Offline
SLE Member
SLE Member

Joined: Wed Mar 12, 2014 1:51 pm
Posts: 46
Year and Trim: 2001 SE
[quote="ddalder"]I assume you replaced the hub(s) with new?

Measuring the hub with an ohm meter really isn't the best test since a short in the coil will still suggest it's intact. You should spin it and measure it with an AC volt meter. Photobucket isn't being very helpful in linking the video I made a few years ago. I know Andrew posted it a while back somewhere on the forum, just can't remember where. Anyway, I used a drill to spin a hub and measured about 750mv. This can vary up and down depending on the speed the hub is turning at.

Yes, they are new assemblies.

Testing the volts will show if the new hubs are bad? If I take...say...a hard-wire wheel to the side of the hub and spun it with the drill (if there is a better way, please tell me), what do think is a good tolerance level of mV? 600-850? What do you think would be too low of a value showing that the hub is bad?

You guys have some good info...it is appreciated.

_________________
J.


Top
 Profile  
 
PostPosted: Thu May 09, 2019 2:01 pm 
Offline
Resident Gearhead
Resident Gearhead

Joined: Wed Apr 01, 2009 7:11 pm
Posts: 2594
Location: Alberta, Canada
Year and Trim: 2004 GXP, 2008 STS, 2020 XT6
Using a wire wheel on a drill is how I spun the hub. Keep in mind that a new hub will be pretty tight compared to one that has some kilometers on it (since I'm in Canada lol). You may find it hard to spin with a drill. I was able to achieve about 750mV consistently at the speed my drill could spin at, but this will vary. Short of using a scope to actually look at the waveform (which is preferred), this will at least provide confirmation that it's generating some type of signal. Because of the way they work on these vehicles (newer vehicles can vary), they produce a small AC signal that changes in frequency and amplitude with speed. The problem with measuring resistance is that it only confirms there is continuity in the coil. There are other problems that can include an excessive air gap in the sensor, broken teeth on the tone ring (also known by some other names) or debris.

In the video below, the section between times 1:40 to 3:47 offers a little information on how the system works and testing.
https://www.youtube.com/watch?v=cGwjonIQaXc

A meter is not nearly precise enough to pick-up signal variations for something like a broken tooth or two, but as I said, it tells you that there is some signal being generated.

If your hub(s) are new, it's not impossible, but very unlikely your problem is there. I'd probably start with the other potential issues.

_________________
Image

Bose Luxury Sound System w/Touch Screen Navigation, Addition of Factory XM, 2005 MY Antenna, OnStar Upgrade (3G),
RainSense Wipers, Backup Camera, '00 Style Door Panel Courtesy Lights, Heated Washer Solvent, 2X Remote Trunk Release,
Turn Signal Mirrors, Center Console Courtesy Lamp, Rear Outboard Heated Seats, PVD Chrome 18" Factory Rims, Upgraded
Carbon Fibre Appearance Interior Trim, Highly Modified Main Body Harness, Instrument Panel, Door, Door Panel & Headliner
Wiring Harnesses, Custom Fuse Box & Tire and Loading Information Decals, Additional Acoustic Insulation


Top
 Profile  
 
PostPosted: Thu May 09, 2019 2:59 pm 
Offline
SLE Member
SLE Member

Joined: Wed Mar 12, 2014 1:51 pm
Posts: 46
Year and Trim: 2001 SE
Thanks, ddalder!

_________________
J.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC - 5 hours [ DST ]


Related topics
 Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Trac Off and Anti-Lock Issue

[ Go to pageGo to page: 1, 2 ]

57j2olds

28

3055

Mon Oct 30, 2017 8:21 am

96 SSEi View the latest post

There are no new unread posts for this topic. Trac Off and Anti-lock lights are on

masher

3

1928

Tue Dec 21, 2010 1:08 pm

harofreak00 View the latest post

There are no new unread posts for this topic. 'Trac Off' and 'Anti Lock' dash lights

hawkjet

13

3781

Wed Oct 22, 2008 2:24 pm

hawkjet View the latest post

There are no new unread posts for this topic. Brake / Anti Lock / Trac Off Lights!!!

chisox.fan

14

3806

Mon Aug 12, 2013 8:09 pm

chisox.fan View the latest post

There are no new unread posts for this topic. sluggish takeoff when anti-lock/trac off light is on

2000GreySSEi

4

2013

Thu Feb 10, 2011 3:20 pm

2000GreySSEi View the latest post

 


Who is online

Users browsing this forum: No registered users and 12 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group


phpBB SEO