abs light help...

[sphinx311]

i have an abs light on and the mechanic said he checked the computer and it has a code saying all four sensors are bad...well he doesn't think this is the case but cant pinpoint what the culprit is anyone know? the abs works somtimes and other times it doesn't and the light comes on.

150k 93 atx

Thanks in advance!!!

 

[Ishodu]

First code displayed is the one to fix first. It just may get rid of them all. If you search my user name for ABS sensors you should find a post where Rangerj tells how to test these sensors.

 

[sphinx311]

thanks again!

 

[Rob94]

The sensors are nothing more than magnets that read a "cog" as it turns with the wheel. It has been my experience that most sensor related ABS problems deal with a dirty sensor. A quick wipe with a shop rag usually ends the problem. Something CHEAP and EASY for you to check out!!

 

[Ishodu]

A build up or rust on the ABS ring will also scrub them. Or a bad wheel bearing.

 

[sphinx311]

thanks again guys

 

[rangerj]

Take a close look at the sensor for dirt, road tar, rust, etc. Then closely look at the ABS ring (cog) for any cracks. When they get cracked it changes the distance between the two cogs and triggers the ABS because it thinks the wheel is moving slower than the others. Also check to see if the teeth of the "cog" are moving through about the center of the sensor.

After you visual inspection you can do the ohm meter tests of the sensors, and continuity test of the wires if necessary. See the threads ISHODU referred you to. I do not ever remember seeing all four ABS sensors go bad on one vehicle. Print out the test procedures and share them with your mechanic. rangerj

 

[93_blk_blk_mtx]

Does anyone have pictures of the sensors mentioned above...

I've got the same issue on my 93 blk SHO, with the same issues..