Antilock Brake light will not go off.


Kurai
05-25-2005, 01:08 PM
1992 Chevy S-10 Blazer (Tahoe LT) w/ 4x4...

... I have pulled the codes from the ECHU and have tried and tried and TRIED to reset the thing the way I was told via my Haynes Manual, but that light simply refuses to go off.

It is my understanding that once you pull the codes, you're SUPPOSED to clear them out and then see if the light comes on again with more codes or to show you're clean.

.. So WHY won't they clear? >_<

rksnc
05-25-2005, 01:20 PM
What were the codes? Have they been repair yet? Sounds like something needs to be repaired.

BlazerLT
05-25-2005, 01:21 PM
What is the code?

Kurai
05-25-2005, 01:26 PM
64, 65, 66 --> but these no longer flash out, only

86 does. :/

[edit: .... which, upon further research, appears to indicate I need to check the light and wiring for the Antilock Brake light for a short circuit; which, of course, I have no idea how to do. ^_^; ]

Kurai
05-25-2005, 08:04 PM
Ok, well, go me! I replaced the PCV valve and then cleaned up the IAC real good, and when I started it up again, it kept running rough like before. On a whim, I checked the codes stored in the ECHU, and there are new ones now:

12
13
31
65

WTF? 12 & 13 list as a faulty ECU, but if that was the case, why would it show up NOW? And 31 wasn't there before, either, and I HIGHLY doubt that my right rear sensor now has a faulty connection after having not touched anything of the sort...XP

BlazerLT
05-25-2005, 11:39 PM
12 is the handshake code saying it is displaying the codes.

13 is an open circuit with the O2 sensor.

As for the 31 and 65, what engine do you have, the Vin Z or the Vin W?

I don't know where you are getting your code descriptions, but they are wrong.

Kurai
05-26-2005, 12:46 AM
12 is the handshake code saying it is displaying the codes.

13 is an open circuit with the O2 sensor.

As for the 31 and 65, what engine do you have, the Vin Z or the Vin W?

I don't know where you are getting your code descriptions, but they are wrong.


It's the W. 8th digit in the VIN, ne?

And, I apologize for being confusing. I've only had this vehicle for about a week now, and I'm not yet familiarized with all it's intricacies, though not for lack of trying. ^_^; I'm actually not sure WHY I got the 12 or 13 out of that, since it was the ECHU (antilock brake light) and not the diagnostic mode (check engine light). I got NO codes at all from the diagnostic mode.

And I've gotten my codes out of the Haynes manual, from the list for the 4WAL system. I think I'm just totally confusing myself (and apparently others -_-) by having 23489234 possibilities of 'what could it be?' running through my head all at once.

I just want the light to go out and my nice new truck to run well, dammit.

rksnc
05-26-2005, 08:07 AM
You need to jump a&h on the aldl plug to check codes. We need to know 4 wheel anti lock or {rwal } rear wheel anti lock brakes.
Code 1--11--12 says bad ecm
Code 13--14--15 says bad ecm
The other codes are between theses codes.
There are only about 9 other codes. Theses code will flash the abs light on dash.

Kurai
05-26-2005, 10:59 AM
You need to jump a&h on the aldl plug to check codes. We need to know 4 wheel anti lock or {rwal } rear wheel anti lock brakes.
Code 1--11--12 says bad ecm
Code 13--14--15 says bad ecm
The other codes are between theses codes.
There are only about 9 other codes. Theses code will flash the abs light on dash.
I DID jump A & H to get these codes. I did A & B for the diagnostic and got nothing but 12. >_>

My vehicle IS 4x4 but I don't know if it's RWAL or 4WAL, and the 4x4 doesn't work at this point as far as I know.

BlazerLT
05-26-2005, 12:58 PM
You need to jump a&h on the aldl plug to check codes. We need to know 4 wheel anti lock or {rwal } rear wheel anti lock brakes.
Code 1--11--12 says bad ecm
Code 13--14--15 says bad ecm
The other codes are between theses codes.
There are only about 9 other codes. Theses code will flash the abs light on dash.

No, 12 is the handshake code.

13 is the O2 sensor open circuit.

rksnc
05-26-2005, 06:32 PM
Hay check this out. This tell you what you want to know.
http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/12/b8/fb/0900823d8012b8fb.jsp

Kurai
05-26-2005, 11:29 PM
So I DON'T do that A&H on 2 seconds, off one second, on 2 seconds again to clear the codes? o_O

...confusing. ~_~

rksnc
05-27-2005, 08:01 AM
I miss type one thing that may be throwing someone off. When I wrote bad ecm It should have been bad ecu. That refers to the control module for abs. I also assume you are getting abs codes not drivability codes from ecm. The ecu is beside brake master. If you disconnect it, the light should go out if that is what has it on. But this will stop abs from workoing but with the light on it isn't working anyway.

Kurai
05-27-2005, 11:48 AM
!!!

So my abs isn't working just because a stupid light is on? That doesn't make much sense. >_>

rksnc
05-27-2005, 09:27 PM
If there is a problem seen by the ABS controler it set a code, turns on the light, and system shut down. It's like how could it work properly if there is a problem with the system?

Kurai
05-28-2005, 10:10 PM
I had another reply posted before this one, but I'm well aware of how annoying a multi-poster can be, so I deleted it in an attempt to be less irritating, before posting a modified/updated post.

I have now come to understand that the ECHU and the ECU are two different things. People say, "The ECU is just beside the master cylinder!!11one", and yet... the only thing I see beside my master cylinder is my windshield wiper motor, and my wiper fluid.

Would anyone care to point out to me where exactly the ECU is in this photo of my engine bay?

http://home.comcast.net/~poltava/wherethefuxx.jpg

Where the heck do I FIND a new ECU for purchase, anyway? I'm iffy about junkyard parts when it comes to electronics.

BlazerLT
05-28-2005, 10:16 PM
How about you take a pic of the WHOLE engine bay so we can help you.

Kurai
05-28-2005, 11:12 PM
That's pretty much it, the only stuff on the left that is out of the picture is the air-conditioning and battery. Unless you'd like one more from above?

BlazerLT
05-28-2005, 11:13 PM
What is on top of the passenger wheel well?

Kurai
05-28-2005, 11:48 PM
Air conditioning components, so far as I can tell:

Pic of my entire engine bay; rather large: http://home.comcast.net/~poltava/everything.jpg

BlazerLT
05-29-2005, 12:01 AM
The ECM is under the glove box.

Kurai
05-29-2005, 12:02 AM
I don't want the ECM. That is the "Engine Computer". I want the ECU--the "Anti-Lock Brake Computer". ^_^*

BlazerLT
05-29-2005, 12:55 AM
I'm pretty sure they are all in the same module.

rksnc
05-29-2005, 09:13 AM
Maybe this will help.
Take a look.
http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/12/b9/37/0900823d8012b937.jsp

rksnc
05-30-2005, 08:28 AM
Now seeing that you have 4 wheel ABS the codes are different than for rwal brakes. There are no 12 &13, don't understand what you are seeing there. The 31 is a bad speed sensor, But it doesn't say which one, and there 4 of them. 65 is a motor relay open or shorted. But now this is what the book says,
code 65 may be by,,,poor power or ground at 2 way connector,,brakes applied with aldl grounded,,attempt to clear codes when none are set,,brakes applied during an erratic speed signal,,erratic aldl ground. Fix the 31 first. Then retry the test drive.

metallica21156
05-30-2005, 08:21 PM
i once talked to a guy who had abs on his car. he said that he slamed on the brakes for some reason. it's a long story but any way afterwards his abs light was on. he said that he went to a open road and got up to 65 and slamed the brakes on. he said it slid and then the ABS kicked in and started working. light then was off as well. he said sometimes they will get a burp in the system and after doing that it resets them. don't know if it works but he claims it does. do at your own risk. why don't you go have the codes cleared and not just pull the fuse.

rlith
05-31-2005, 07:17 AM
I don't want the ECM. That is the "Engine Computer". I want the ECU--the "Anti-Lock Brake Computer". ^_^*

Ok, you really don't have one on your motor. Your ABS is manually controlled. (like the 94 and below) If you had the ECM under the hood you would have the abs computer (which is integrated into the ABS module itself). Your abs setup is similar to the 96/97 k1500 setup.

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