93 Camaro Z28 ABS trouble - Team Camaro Tech
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post #1 of 6 (permalink) Old Sep 13th, 03, 11:48 AM Thread Starter
 
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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....
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post #2 of 6 (permalink) Old Sep 13th, 03, 04:24 PM
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Just for grins check your 3rd brake light. I remember someone posting something about it a while back...

...Dennis

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post #3 of 6 (permalink) Old Sep 13th, 03, 05:45 PM Thread Starter
 
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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
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post #4 of 6 (permalink) Old Sep 13th, 03, 07:59 PM
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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.

-dnult

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post #5 of 6 (permalink) Old Sep 14th, 03, 03:25 PM
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Plaese let me know what you find, as my '95 is doing the same thing.
Guy

oh, whats the deal about the "3rd" brake light?
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post #6 of 6 (permalink) Old Sep 15th, 03, 06:58 AM
 
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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.
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