NAIOA.comNAIOA.comNAIOA.com
 Create an Account
 

  
NAIOA Impala Forums :: View topic - Chasing some ABS issues
GarageGarage    1/4 Mile Table1/4 Mile Table    Forum FAQForum FAQ    SearchSearch    UsergroupsUsergroups   MedalsMedals
MemberlistMemberlist   ProfileProfile    Watched TopicsWatched Topics    Log in to check your private messagesLog in to check your private messages    Log inLog in 

Chasing some ABS issues

 
Post new topic   Reply to topic    NAIOA Impala Forums Forum Index -> 2000-2005 Wheels, Tires, Brakes, and Suspension
View previous topic :: View next topic  
Author Message
DennisW
Forum Regular
Forum Regular


Joined: Nov 30, 2010
Posts: 205
Posts per day: 0.08


2004 Chevrolet Impala


PostPosted: Mon May 02, 2011 8:55 pm    Post subject:  Chasing some ABS issues Reply with quote

2004 Impala 9C1 (obviously with ABS)

ABS light has been coming on lately. When the car is first started the light is off, comes on within a couple hundred yards of driving.

I've recently acquired one of the newer Actron scanners that also scans the ABS systems and I get the following:

C1224 - Right Rear Wheel Speed Sensor Input Signal = 0

C1228 - Right Rear Excessive Wheel Speed Sensor Variation

C1235 - Right Rear Wheel Speed Sensor Circuit Open or Shorted

Well, at least we know which wheel the problem is in!

I've done a quick visual inspection of the weatherpak connector at the wheel end and where the whole harness plugs in to the body, sprayed some contact cleaner in both and a light application of dilectric grease but this hasn't solved the problem.

I seem to recall reading that it's rarely the actual sensor in the hub going bad, so I'm working on that theory. Next step I guess it replacing the wiring harness. Morad parts has one for $32 shipped to me and that's a significant bit cheaper than replacing a hub. Curious if there is any way of checking the sensor in the hub.....ohm meter perhaps?

Thoughts, or similar problems and/or solutions that anyone else might have?
Back to top
View user's profile Send private message
bbengineer
NAIOA Owner / Webmaster
NAIOA Administrator
NAIOA Administrator


Joined: Jun 01, 2005
Posts: 9496
Posts per day: 2.08
Location: NJ

2004 Chevrolet Impala
1998 Chevrolet Corvette
2007 Chevrolet Tahoe
2008 Subaru Impreza
1970 Chevrolet Chevelle


PostPosted: Mon May 02, 2011 9:46 pm    Post subject:  Re: Chasing some ABS issues Reply with quote

DennisW wrote:

I seem to recall reading that it's rarely the actual sensor in the hub going bad, so I'm working on that theory.


I don't think that is necessarily true... but here are some things to check

Using a DMM, check the resistance across the sensor in the hub (it should not be open or a short)

Then using the lowest AC voltage setting, spin the hub and measure the voltage. You should see voltage generated when you spin the hub

BBEngineer

_________________

Decisions...Decisions...
Back to top
View user's profile Send private message Visit poster's website
DennisW
Forum Regular
Forum Regular


Joined: Nov 30, 2010
Posts: 205
Posts per day: 0.08


2004 Chevrolet Impala


PostPosted: Mon May 02, 2011 10:17 pm    Post subject:  Re: Chasing some ABS issues Reply with quote

bbengineer wrote:
DennisW wrote:

I seem to recall reading that it's rarely the actual sensor in the hub going bad, so I'm working on that theory.


I don't think that is necessarily true... but here are some things to check

Using a DMM, check the resistance across the sensor in the hub (it should not be open or a short)

Then using the lowest AC voltage setting, spin the hub and measure the voltage. You should see voltage generated when you spin the hub

BBEngineer


Good ideas. That's tomorrow's project, weather permitting.
Back to top
View user's profile Send private message
DennisW
Forum Regular
Forum Regular


Joined: Nov 30, 2010
Posts: 205
Posts per day: 0.08


2004 Chevrolet Impala


PostPosted: Thu May 05, 2011 3:02 am    Post subject:  Re: Chasing some ABS issues Reply with quote

bbengineer wrote:
DennisW wrote:

I seem to recall reading that it's rarely the actual sensor in the hub going bad, so I'm working on that theory.


I don't think that is necessarily true... but here are some things to check

Using a DMM, check the resistance across the sensor in the hub (it should not be open or a short)

Then using the lowest AC voltage setting, spin the hub and measure the voltage. You should see voltage generated when you spin the hub

BBEngineer


Well crap.......its the hub, or more accurately, the sensor in the hub.

Rats!

And updating the issue, the hub has been replaced and the ABS system works once again! I love the GM Service manuals, they neglect to mention to you that the aluminum upright with a steel hub pressed into it is going to take a bit of effort to seperate the hub from the upright. All the book says is "remove the hub from the upright". Thanks GM, maybe you could have mentioned that an axle puller slide hammer is needed to persaude the two to seperate?

So now I have a spare rear wheel ABS harness, in good working condition, that I don't need.....anyone interested? Morad sold it to me for $32 shipped, I'll do the same to anyone interested
Back to top
View user's profile Send private message
Ralph04
Newbie
Newbie


Joined: Jun 12, 2011
Posts: 10
Posts per day: 0


2004 Chevrolet Impala


PostPosted: Mon Jun 13, 2011 10:46 am    Post subject:  Rear Hub Replacement Reply with quote

Got any photos of the the aluminum upright with a steel hub pressed into it ? I just replaced the left front hub - which is bolted in. Pretty easy off - pretty easy in. BTW, how did you determine the hub was bad ? I had a previous intermittent problem with the left front hub (would go off with very slow driving and turns) - which went away by draining accumulated water in the sensor wire sheathing (seem to recall there was about a 1/4 teaspoon).
Back to top
View user's profile Send private message
DennisW
Forum Regular
Forum Regular


Joined: Nov 30, 2010
Posts: 205
Posts per day: 0.08


2004 Chevrolet Impala


PostPosted: Mon Jun 13, 2011 10:54 am    Post subject:  Re: Rear Hub Replacement Reply with quote

Ralph04 wrote:
Got any photos of the the aluminum upright with a steel hub pressed into it ? I just replaced the left front hub - which is bolted in. Pretty easy off - pretty easy in. BTW, how did you determine the hub was bad ? I had a previous intermittent problem with the left front hub (would go off with very slow driving and turns) - which went away by draining accumulated water in the sensor wire sheathing (seem to recall there was about a 1/4 teaspoon).


nope, no photos sorry.

Diagnosis started by scanning the abs system and reading the codes that pointed to the right rear wheel. Tested the harness for continuity all the way back to the abs controller and determined that the wiring was intact. that left only the actual sensor in the hub as the culprit, which it was.

an axle puller slide hammer got the hub out fairly easy, but just trying to pull it out with my hands wasn't gonna cut it. it took a couple good blows with the slide hammer to get it loose.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    NAIOA Impala Forums Forum Index -> 2000-2005 Wheels, Tires, Brakes, and Suspension All times are GMT - 4 Hours
Page 1 of 1

 
Jump to:  
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 vote in polls in this forum

Powered by phpBB © 2001, 2005 phpBB Group
Forums ©
All logos and trademarks in this site are property of their respective owner. Comments and posts are property of the poster. All other content is © 2008 by the NAIOA.


Use of this site constitutes agreement with the NAIOA Terms of Service (TOS)


PHP-Nuke Copyright © 2005 by Francisco Burzi. This is free software, and you may redistribute it under the GPL. PHP-Nuke comes with absolutely no warranty, for details, see the license.
Server Local Time: November 23, 2017, 12:20:06 pm
Page Generation: 0.12 Seconds ( SQL 27:111 in 0.01 Seconds )