Question about 2002 Jeep Wrangler

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ABS not working

The tires of my second hand jeep often lock when I need to brake suddenly or stop quickly. This often occurs when I am trying to stop downhill. I have a feeling this is to do with the ABS as the ABS light on the dashboard never lights up. What's wrong with it!!

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  • rsteele07 Nov 10, 2008

    Thanks for your suggestion... I bought it from a dealership so can't ask the previous owner whether the bulb was removed but I will do what you suggested.

    I've had a whole list of problems with it since I bought it... I will list them one at a time!

    Problem A - Tires locking when braking hard.

    Problem B - When I drive on uneven ground (off road for instance) I hear a deep sounding clunk coming from the underneath the rear of the car. Fuel tank perhaps? It sounds almost as if something is swaying side to side. This noise is not constant - just occasional.

    Problem C - Some days are better than others on this one. When I'm driving (usually slowly) it feels almost as if the right rear wheel is jolting (moving in a way it is not supposed to move). The first time this happened I thought someone had gently bashed into the back of me as the car shook slighly. When I looked back no car was there so that wasn't the case!!

    Problem D - When I drive over 120km/h the AC plays up. Air starts coming from the vents by your feet and the vent at the top by the wind-shield. When you slow down it starts coming out of the face vents again (the vent selected on the dial).

    Thank you so much for any help you can give!! This car of mine needs to get into shape!



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When you put the ignition on, does the ABS light come on? If not may be the previous owner has removed the bulb because ther was a fault with it? if your answer is positive then probably the beat thing to do is to insert a new bulb and see if the light stays on. Check the fuses and remove the battery terminal for 6 minutes and refit it an start the car and see what it does. If it stays on then you'll have to get it scanned.
Let us know how you get along with it.

Posted on Nov 10, 2008

  • Armel Aubeelack
    Armel Aubeelack Nov 12, 2008

    Problem B: I think you might have a suspension rear bush that might be worn and causing that noise on uneven roads.

    Problem C: You might have to jack up that wheel and turn it, check your rim for any damage (out of round).

    Problem D: You might have an air vent connectors unhooked and the pressure of the wind at high speed opene the flap and letting air in. A visit to the electrician is appreciated.




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ABS has a sensor which is basically like a metal blade which sticks into the tire attachment into grooves.As the tire turns,the blade senses the RPM.When you brake suddenly,the sensor tells the computer when your tire is about to skid and releases brake pressure.It applies and releases brake pressure very quickly so as not to cause a skid.One of these may be going bad.A computer check can tell you quickly,but you probably know about computer application pricing.If you want to buy one and switch tires every couple days you could probably find out,but it would be very tedious.Good luck.

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The ABS sensors modulate the brake caliper pistons andapply and let go the brakes very quickly. This stops the tires from skidding and you will feel a pulse through the brake pedal as the hydraulic system is forced to release the pedal slightly for a fraction of a second.

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