djmark7 Posted September 3, 2007 Share Posted September 3, 2007 Riddle me this, Batman, why does my ABS light come on during highway driving around 2800 RPM, never comes on around town and if i shut off motor and continue highway driving sometimes itll stay off, I'm puzzled Where's The Penguin when you need him? Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted September 3, 2007 Share Posted September 3, 2007 Probably something to do with a wheel sensor not reading properly at that speed. That's just a guess though. But I don't know of any other way the ABS would know how fast you are going. GD Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted September 3, 2007 Share Posted September 3, 2007 It can also mean your alternator is getting ready to give up the magic smoke. Quote Link to comment Share on other sites More sharing options...
OB99W Posted September 3, 2007 Share Posted September 3, 2007 Riddle me this, Batman, why does my ABS light come on during highway driving around 2800 RPM, never comes on around town What happens if you downshift and drive at a lower road speed that still has the engine RPM at 2800? and if i shut off motor and continue highway driving sometimes itll stay off, I'm puzzled[...]I'm puzzled too :-\ ; please explain what you mean by "shut off motor and continue highway driving" in a bit more detail. Quote Link to comment Share on other sites More sharing options...
djmark7 Posted September 3, 2007 Author Share Posted September 3, 2007 if i pull over shut off motor restart and continue driving, sometimes the light will stay off Quote Link to comment Share on other sites More sharing options...
PAezb Posted September 3, 2007 Share Posted September 3, 2007 Since the symptoms seem to be speed related: Do you drive on particularly dusty or muddy roads often? If so, you might simply have a dirty sensor that is border line sensing - try using a high pressure (not too high) sprayer at local car wash and cleaning the inside wheels from underneath. Otherwise, physically inspecting the sensors on the inside wheel may be needed, and spray cleaning with a non-chlorine brake cleaner. While rare, the ABS sensors can also get damaged by continually abrasive road sand, dust, etc. Might be something else totally, like the charging system Porcupine73 eluded to, but that is where I'd start... Quote Link to comment Share on other sites More sharing options...
djmark7 Posted September 3, 2007 Author Share Posted September 3, 2007 no muddy roads, ill try that im leasning toward the alt theory tho Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted September 3, 2007 Share Posted September 3, 2007 If the alt were pushing AC then it should light up all the warning indicators. This happens because AC voltage defeats the diode's in the ground circuits used by the warning indicators. At any rate it should be happening based on engine RPM and not vehicle speed as you describe. At least that's my take on it, and I've dealt with a number of failed alternators putting out AC. GD Quote Link to comment Share on other sites More sharing options...
idosubaru Posted September 3, 2007 Share Posted September 3, 2007 it's common for the wheel speed sensors to need replacement. dig around on here and find the endwrench instructions for pulling the code. if the ABS light is coming on, it's telling you what the problem is and will tell you the code. it's very simple to do if you're comfortable grounding one pin of a wiring harness. it's just about the gas pedal. Quote Link to comment Share on other sites More sharing options...
nipper Posted September 3, 2007 Share Posted September 3, 2007 Check the charging circuit first. Next most likely candiate is you have a slightly eroded wheel sensor that is giving a false signal. The sensors should be perfectly cylindrical in shape. Also they may be covered with debree. nipper Quote Link to comment Share on other sites More sharing options...
sea#3 Posted September 3, 2007 Share Posted September 3, 2007 Riddle me this, Batman, why does my ABS light come on during highway driving around 2800 RPM, never comes on around town and if i shut off motor and continue highway driving sometimes itll stay off, I'm puzzled Where's The Penguin when you need him? Read the codes and see what it says , If its code 42 check the alternator SEA#3 ABS CODES.zip 98 Leg Abs codes.doc Quote Link to comment Share on other sites More sharing options...
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