93 Camaro Z28 ABS trouble - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old Sep 13th, 03, 11:48 AM Thread Starter
Join Date: May 2002
Posts: 21

My 93 Camaro ABS INOP light is on all the time.
I bought an OTS Scan Tool to troubleshoot the system. It told me I had a code 22 which means "RF wheel speed sensor function." I installed a replacement speed sensor on the right front wheel. The sensor is integral to the wheel hub so I had to purchase the entire wheel hub. Installed the replacement hub and I still have the same fault code. Also on a road test with the scan tool it shows a constant 0mph for the RF wheel sensor. The LF and rear speed readings are normal. It appears all the wiring connections are sound and in good condition. I have the 93-96 Haynes manual for the car but it has basically nothing on the Anti-Lock system and no wiring diagrams for the ABS in particular. This high tech stuff sure isn't what my 69 Camaro is to work on. Thank GOD! I could sure use some help.
Thanks, Ray....
rbks50 is offline  
Sponsored Links
post #2 of 6 (permalink) Old Sep 13th, 03, 04:24 PM
DjD's Avatar
Join Date: Apr 1999
Location: Fortuna, CA
Posts: 26,461

Just for grins check your 3rd brake light. I remember someone posting something about it a while back...


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

"Don't take life so serious, you won't get out alive..."
DjD is offline  
post #3 of 6 (permalink) Old Sep 13th, 03, 05:45 PM Thread Starter
Join Date: May 2002
Posts: 21

Thanks for the reply Dennis. The 3rd brake light didn't pan out but it didn't hurt to try.
Do you or anyone else know where the EBCM black box, brain of the brake system, is located on the vehicle? I found the ABS wiring schematic on this web address listed below. Check it out. Found it to be very informative and packed full of info on 4th gen camaros. Take care, Ray.... http://www.csce.uark.edu/~jgbertr/rb/4th_gen_tech1.html
rbks50 is offline  
post #4 of 6 (permalink) Old Sep 13th, 03, 07:59 PM
Senior Tech
Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277

Just a stab in the dark here, can you disconnect the ABS computer harness and measure each wheel sensor lead to ground. I wonder if a wire has worn through and grounded out in the RF circuit. Any open leads in the circuit? Definately would need a schematic to trace it all out.


68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
dnult is offline  
post #5 of 6 (permalink) Old Sep 14th, 03, 03:25 PM
Senior Tech
Join Date: Aug 2001
Location: Bogalusa, La., USA
Posts: 417

Plaese let me know what you find, as my '95 is doing the same thing.

oh, whats the deal about the "3rd" brake light?
gjohnson is offline  
post #6 of 6 (permalink) Old Sep 15th, 03, 06:58 AM
Join Date: Jun 2003
Posts: 771

gjohnson, some GM vehicles run all the abs thru the third brake light circuit. if the bulb is out, or another problem with it, the abs light will come on, and the abs will not function.

rbks50, if checking for a shorted or open wire doesn't pan out, make sure the right front is actually wired to the right front. some cars' sensors got reversed at the factory. just hook up your scan tool, and spin the LF wheel to make sure it is reading. i dont think it was the camaros that got switched, but it doesnt hurt to check.
ohcscott is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome