Jazzy_J Posted February 15, 2012 Report Share Posted February 15, 2012 Ever since I bought my 98 v70 it has been having ABS issues. It will disable the ABS and Traction control randomly and will sometimes turn back on all in the same trip. So far I have seen no consistency as to when it happens. Personally I don't care about the traction control I'm concerned with the ABS, when it fails the brake pedal will pulse (if you're already applying brake) and doesn't fully engage until the ABS fully disabled, or until you lift your foot off the pedal (not good in an Oh Crap situation). Thats my main concern as sometimes family members drive it. I know the ABS module does go bad on most of the v70s, but before i go and replace that I wanted to be sure that it wasn't a sensor or something. So heres the questions... 1. Besides the actual ABS Module and Sensors Is there anything else that can fail? 2. Is there a way to test the Module? And the sensors? Thanks in advance. Link to comment Share on other sites More sharing options...
Matty Moo Posted February 15, 2012 Report Share Posted February 15, 2012 Wiring occasionally...more so if the front end has been touched without unplugging the sensors or if the wiring has been rubbing against the endlinks. Sensors...not too often. You can test the module on another car, but that's about it. You can test the sensors and the wiring going to them straight from the harness using a multimeter, but this won't always detect a physically damaged sensor, tone ring, loose axle or things like that. Typically it plays out like this. 95% of the time it's the module. 5% of the time it's a wiring or sensor issue. 96-98's are essentially stand-alone as far as the abs system goes, so you don't have to worry about much else screwing with the system outside of the ignition switch or a voltage problem....you aren't networked. Link to comment Share on other sites More sharing options...
D s50r Posted February 15, 2012 Report Share Posted February 15, 2012 Check your pulse wheels on ur front axels. I can almost guarantee that's ur problem the rings brake due to rust or corrosion and the wheel sensors get inaccurate readings Link to comment Share on other sites More sharing options...
Dan A Posted February 15, 2012 Report Share Posted February 15, 2012 As MattyMoo said the most common cause is the module. I don't know if he still offers the service but I had mine fixed by him about two years ago and still going strong. Link to comment Share on other sites More sharing options...
Matty Moo Posted February 15, 2012 Report Share Posted February 15, 2012 Start with the easiest stuff first. Click on my website in my sig and go to the troubleshooting page. The pinout diagram and resistance specs are there. Should only take a few minutes to test. If you want you can then pull each wheel and pull out the sensors and clean them. At the same time you can inspect the tone rings. You can almost bet that if it's the original module then that's the problem. I can open up 1000 of them and maybe find a handful that have zero cracking of any kind inside. Link to comment Share on other sites More sharing options...
D s50r Posted February 15, 2012 Report Share Posted February 15, 2012 For random abs activation I've only seen the tone rings cause that problem Link to comment Share on other sites More sharing options...
Jazzy_J Posted February 17, 2012 Author Report Share Posted February 17, 2012 Thanks for all the info. Link to comment Share on other sites More sharing options...
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