idosubaru Posted July 2, 2007 Share Posted July 2, 2007 the ABS light is on in my 1998 Legacy GT sedan. when the ABS light comes on, the brakes work fine (though i've never tested the ABS action). when the ABS light goes out, the brakes make all sorts of pulsation noises and don't work very well at all. from searcing it looks like there was a relay issue on older models, but this is a 1998? could it still be the relay? i believe it's behind or under the ABS unit from reading? the codes were read awhile ago and from memory are supposed to be the rear ABS sensor. are these interchangeable from left to right? Link to comment Share on other sites More sharing options...
OB99W Posted July 3, 2007 Share Posted July 3, 2007 [...]the codes were read awhile ago and from memory are supposed to be the rear ABS sensor. are these interchangeable from left to right? You should be able to confirm any codes using the diagnostic connector (B82, if memory serves) and a ground probe. They're taped to the harness under the dash in the vicinity of the brake pedal. Do a search here for details. The sensor tips can corrode, the tone wheels can be damaged, something could affect the spacing between the two, wiring or connectors could have "issues", etc. Since the sensor is magnetic, the tip may have attracted some ferrous metal to it and be causing a problem. You could compare resistance of the two rear sensors to verify that the coil is intact. Basically, start with the code to determine location, then troubleshoot further to determine if the problem is with the sensor itself or something else. I believe that the right and left wheel speed sensors are different, due to the angle they mount at. Link to comment Share on other sites More sharing options...
idosubaru Posted July 3, 2007 Author Share Posted July 3, 2007 thanks! i finally found some info on retrieving the codes here: http://www.ultimatesubaru.org/forum/showthread.php?t=23956&highlight=abs+light endwrench ABS info here: http://www.endwrench.com/pdf/brakes/FtSubaruABSS99.pdf Link to comment Share on other sites More sharing options...
OB99W Posted July 3, 2007 Share Posted July 3, 2007 There's some brake- and ABS-related info in the August 2002 issue of The End Wrench; the articles can be retrieved from the archive. Link to comment Share on other sites More sharing options...
OB99W Posted July 3, 2007 Share Posted July 3, 2007 I found my first post to the board, which covered efforts (successful, with help from members!) to fix my own ABS system. It seems at that time I wrote that the diagnostic connector is near the accelerator (not the brake) pedal, and that's more accurate. Here's a link: http://www.ultimatesubaru.org/forum/showthread.php?t=46918 Link to comment Share on other sites More sharing options...
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