BMW M3 Forum
BMW M3 Forum BMW M3 Gallery BMW M3 Reviews BMW M3 Social Groups BMW M3 Chat M3Forum Sponsors >>
Loading


Mobile M3forum
Go Back   BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X) > BMW M3 Discussions > E36 M3 (1992-1999)
Tire Rack Buy Winter Tires Now!
Not a member? Register Now!
Register Gallery All Albums Garage Search Today's Posts Mark Forums Read Calendar FAQ

E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


Reply
 
Thread Tools Display Modes
Old Thu, May-21-2015, 02:50:40 AM   #101
jhott66
Registered User
 
Join Date: Jul 2008
Posts: 99
In the garage:
Reputation: 0 jhott66 is on a distinguished road

United States




Default Re: The definitive guide to self diagnosing your ABS/ASC light.

Quote:
Originally Posted by Garage5 View Post
I have no power at pins 3,16, and 33 at my ABS harness plug. I do have power at 35 and 51. The relay is good. When the relay is pulled. I got 4 volts at 16 and 33. The relay is good though.

1999 BMW M3

What did you find was the problem? I also have no power at pins 3, 16, 33 with relay installed. I have 12 V with relay removed. It's a new relay.
Strange.


Sent from my iPhone using Tapatalk
Jump to top jhott66 is offline   Reply With Quote
Sponsored Links
Register now and remove these ads
Old Thu, May-21-2015, 11:44:59 PM   #102
circuit_icon
Registered User
 
circuit_icon's Avatar
 
Join Date: Sep 2013
Posts: 272
Reputation: 0 circuit_icon is on a distinguished road

United States




Default Re: The definitive guide to self diagnosing your ABS/ASC light.

Just tested a BRAND NEW ABS relay and got 5 Mega Ohms between 30 and 30a. I suspect that the spec listed in this thread of 50-100 Ohms is incorrect.
Jump to top circuit_icon is offline   Reply With Quote
Old Fri, May-22-2015, 12:03:39 AM   #103
circuit_icon
Registered User
 
circuit_icon's Avatar
 
Join Date: Sep 2013
Posts: 272
Reputation: 0 circuit_icon is on a distinguished road

United States




Default Re: The definitive guide to self diagnosing your ABS/ASC light.

As a quick and dirty test, I took an ABS pump that I had on the bench and plugged it in under the hood (so it's not installed, but it is "installed" as far as the electronics are concerned).

When we measure the resistance at the ABS computer harness, we were still getting around 40 Ohms for each pin, compared to around 8 when measured at the pump itself. So both pumps have similar resistances.

I then started the car with the different pump "installed", and the ABS light was still illuminated.
Jump to top circuit_icon is offline   Reply With Quote
Old Sun, May-24-2015, 07:05:47 PM   #104
The Producer
Registered User
 
The Producer's Avatar
 
Join Date: Feb 2014
Posts: 40
In the garage:
Reputation: 0 The Producer is on a distinguished road
Location: North Shore

Canada




Default Re: The definitive guide to self diagnosing your ABS/ASC light.

I feel your pain - I've been chasing an ABS/ASC light issue since christmas. Both relays and pedal sensor are new.

Found a guy with a GT1 setup (not emulated - authentic yellow diagnostic head) Cleared a bunch of old codes, none ABS related. We then queried the ABS computer directly and got a module not present error. New hypothesis/diagnosis is that I need a new ABS ECU.

I've read through all of these threads here and elsewhere, and I have a question that I haven't seen before. In a transition car like mine, with a round diagnostic plug and an OBD2 port, is it possible that certain modules can only be read from certain ports? Example: is it possible that the GT1 couldn't see my ABS/ASC+T modeule because we were connected to the round port? He didn't have the adapter to connect to the OBD2 plug.

Next step for me is a used ABS ECU I think. I just hate the thought of chasing this type of issue with parts.


Last edited by The Producer; Sun, May-24-2015 at 07:34:34 PM.
Jump to top The Producer is offline   Reply With Quote
Old Sun, May-24-2015, 09:04:09 PM   #105
frbz
Registered User
 
Join Date: Sep 2006
Posts: 295
Reputation: 0 frbz is on a distinguished road





Default Re: The definitive guide to self diagnosing your ABS/ASC light.

On the E36 the only thing accessible through the obdII port is the engine computer (DME). All other modules need to be accessed through the round port in the engine bay. The E46 lost the round port and all access to the modules is through the OBD II port.
Jump to top frbz is offline   Reply With Quote
Old Sun, May-24-2015, 09:09:52 PM   #106
The Producer
Registered User
 
The Producer's Avatar
 
Join Date: Feb 2014
Posts: 40
In the garage:
Reputation: 0 The Producer is on a distinguished road
Location: North Shore

Canada




Default Re: The definitive guide to self diagnosing your ABS/ASC light.

Quote:
Originally Posted by frbz View Post
On the E36 the only thing accessible through the obdII port is the engine computer (DME). All other modules need to be accessed through the round port in the engine bay. The E46 lost the round port and all access to the modules is through the OBD II port.
That's good for me - it removes a variable from the results of today's testing. Thanks for the info

Now I've got to dig out the module to get the part #, put it back in to stay mobile and swap it back out again when I find a replacement.
Jump to top The Producer is offline   Reply With Quote
Old Tue, May-26-2015, 01:25:30 PM   #107
jhott66
Registered User
 
Join Date: Jul 2008
Posts: 99
In the garage:
Reputation: 0 jhott66 is on a distinguished road

United States




Default Re: The definitive guide to self diagnosing your ABS/ASC light.

Quote:
Originally Posted by circuit_icon View Post
Just tested a BRAND NEW ABS relay and got 5 Mega Ohms between 30 and 30a. I suspect that the spec listed in this thread of 50-100 Ohms is incorrect.
The resistance value quoted at the beginning of this thread is incorrect. 5 MOhms is in the ball park of the correct value.
Jump to top jhott66 is offline   Reply With Quote
Old Tue, May-26-2015, 01:30:03 PM   #108
pbonsalb
Registered User
 
Join Date: Jun 2005
Posts: 3,612
Reputation: 0 pbonsalb is on a distinguished road





Default Re: The definitive guide to self diagnosing your ABS/ASC light.

Is ABS light tied into traction control? Such that TC removal can trigger ABS light if the removal does not keep the TC electronics plugged in or have them bypassed,
Jump to top pbonsalb is offline   Reply With Quote
Old Tue, May-26-2015, 09:24:41 PM   #109
circuit_icon
Registered User
 
circuit_icon's Avatar
 
Join Date: Sep 2013
Posts: 272
Reputation: 0 circuit_icon is on a distinguished road

United States




Default Re: The definitive guide to self diagnosing your ABS/ASC light.

Quote:
Originally Posted by jhott66 View Post
The resistance value quoted at the beginning of this thread is incorrect. 5 MOhms is in the ball park of the correct value.
Thanks for clarifying.
Jump to top circuit_icon is offline   Reply With Quote
Old Tue, May-26-2015, 09:25:32 PM   #110
circuit_icon
Registered User
 
circuit_icon's Avatar
 
Join Date: Sep 2013
Posts: 272
Reputation: 0 circuit_icon is on a distinguished road

United States




Default Re: The definitive guide to self diagnosing your ABS/ASC light.

Quote:
Originally Posted by pbonsalb View Post
Is ABS light tied into traction control? Such that TC removal can trigger ABS light if the removal does not keep the TC electronics plugged in or have them bypassed,
I'm wondering this too. I have TC removed in my car. But it was removed before having these ABS light issues.
Jump to top circuit_icon is offline   Reply With Quote
Reply

Bookmarks

Tags
abs or asc, definitive, diagnosing, guide, light

Thread Tools
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

Forum Jump



All times are GMT. The time now is 06:49:00 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
M3Forum.com and M3forum.net is in no way sponsored, endorsed or affiliated by or with BMW NA / BMW AG or any of it's subsidiaries or vendors.
BMW and M3 (E90 M3 | E92 M3 | E93 M3 | E46 M3 | E36 M3 | E30 M3) are registered trademarks of BMW AG.
M3Forum Terms of Service
Copyright 1999-2017 M3Forum.com
Discussing The definitive guide to self diagnosing your ABS/ASC light. in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)