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Old 02-12-2014, 06:29 PM   #1
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ABS Light ON

Hi;
The ABS light has been on since I bought my 95YJ three years ago. Just now wishing it worked. Is there a typical cause or an established diagnostic procedure? I was thinking about buying one wheel sensor and just trying replacing one wheel unit at a time, but that might be wasted effort. There is probably a lot of info on the Forum somewhere, but I haven't found it yet. Any advice would be appreciated. Trying to avoid taking it to the shop. But maybe....
Thanks.
Rich

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Old 02-12-2014, 06:35 PM   #2
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you're jeep is saying it wants to do some sit ups! hahaha jk anyway there are alot of problems with ABS in 95 yj's since it was the first year that ABS was an option!

The very first thing I would check is the fuse under the hood, there should be a little diagram of the fuses under the lid of the fuse box, figure out which one is for ABS and pull it. look at it really carefully in front of a flash light and make sure it hasn't been blown. that is just a first diagnostic step.

If it is blown then it was most likely caused by something that needs to be fixed, but this is a good starting point.

Edit: now that I think about it there is probably a relay not a fuse so you will need a multimeter to check it

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Old 02-12-2014, 10:26 PM   #3
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Hi;
Thanks. I can do such things. Be nice if that's all it is. I'll take a peek tomorrow.
Rich
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Old 02-12-2014, 10:31 PM   #4
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Like i said if it is blown there is probably something else wrong that blew it. But sometimes relays can just go bad, im just saying not to get ur hopes up
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Old 02-12-2014, 10:42 PM   #5
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Does your ABS ever engage irregularly? That would be a bad sensor. If not then one sensor could be disconnected that will cause a light on condition. If they are not disconnected then it will most likely be a wiring problem or a fuse like Pittsburgh said before.
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Old 02-12-2014, 10:49 PM   #6
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I took what the OP said to mean that the ABS doesnt work at all, could be wrong tho
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Old 02-13-2014, 03:56 PM   #7
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Hi;
Thanks for the responses. The ABS does not work. I did check the three fuses - 2 amp module, 30 amp system and 40 amp pump. Dirty, but continuous. I cleaned them up and put them back. There are two relays - the ABS pump and the ABS system power. I was just going to replace both until I found out they are in the $50 range - each. Good idea to check the sensors and the wires to them. Will do. I did try to buy a wheel sensor at the parts store and just try it one wheel at a time, but they didn't list one. Huh? I assume the sensor is close to the wheel in the hub area. That right? I'll snoop.
Appreciate your suggestions. I was sort of hoping that the "widget" was a known bad actor and a likely candidate. Like you guys steered me to the CAD when the FWD wasn't working.
Thanks.
Rich
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Old 02-13-2014, 04:10 PM   #8
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Well this is a great start. You are already ruling things out! Do u have a multimeter? If so i would check the relays with it if not either consider getting a $10 one or maybe borrow one from a parts store? About the sensor, i dont have ABS on mine so im not sure about 95 yjs but on most vehicles ive worked on there is an ABS sensor near the bottom shock mount.
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Old 02-13-2014, 06:43 PM   #9
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My 94 has ABS and I believe the sensor is on the hub/knuckle area where the gear looking thing on the axel is. There should be a magnetic type sensor that senses the wheel has locked up.

Edit:

Quadratic sells them same part as other jeeps.
http://www.quadratec.com/products/55200_0105.htm
Hit the parts store with a same year Cherokee see if they have one.
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Old 02-14-2014, 05:07 AM   #10
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Most of the early ABS were rear only, not sur if this is the case with Jeeps. Most use a speed sensor on the tranny to sense the rear wheels. If it has front antilock the reluctor is built into the hub assembly an the sensor fits into the hub.
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Old 02-14-2014, 09:03 AM   #11
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Yjs have them on the front axle. Not sure if they have anything in the rear it not.
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Old 02-14-2014, 07:23 PM   #12
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Hi;
Yes, I have a multimeter - one digital and one analog. I just have no idea how to check the relays. My manual is no help at all. Each of the relays have five or six prongs on them. I can't find any reference as to the resistance, weather to check with 12 volts running through, etc. Is there a diagnostic procedure for those things listed anywhere? I hope to have a few minutes to hunt wheel sending units tomorrow but now have a better idea where to look.
Thanks.
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Old 02-15-2014, 07:18 AM   #13
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my 94 has the abs light on,but i have an 8.8 rear so not sure if thats why mine is on
..im watching this thread..
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Old 02-15-2014, 05:52 PM   #14
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Hi;
Yep, there are sensors on all four wheels. On the front they are just as Twister describes above. One bolt, (guaranteed to break) to get them off. On the rear, the wires go through the backing plate and I'd have to pull the drums off to see what's there. I did inspect the wires and all look good from the sensors to the bundle. I didn't try checking the connectors for corrosion - still too cold here. Think I'll let the ABS go for a while and replace the thermostat, the speedometer speed sensor, the fuel filter, and the dozen other jobs that need attention. Thanks for all of your good advice. Oh. If anyone has info on checking the relays I'd appreciate it.
Rich
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Old 02-15-2014, 06:27 PM   #15
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Old 02-21-2014, 07:24 PM   #16
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Hi Pittsburghwrangler;
Thanks for the video. Great explanation. Much appreciated. I can do!!
Rich
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Old 02-22-2014, 09:53 AM   #17
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my 94 has the abs light on,but i have an 8.8 rear so not sure if thats why mine is on
..im watching this thread..
when the 8.8 was installed, they probably unplugged the sensors from the d35 and had nowhere to hook them back up so didn't. ABS light is on to let you know that the ABS system is not working. Might as well pull that bulb
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Old 02-22-2014, 10:20 AM   #18
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when the 8.8 was installed, they probably unplugged the sensors from the d35 and had nowhere to hook them back up so didn't. ABS light is on to let you know that the ABS system is not working. Might as well pull that bulb
wouldnt that depend on the year of truck it came from? im actually not sure since ive never done an axle swap, just asking.
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Old 02-22-2014, 12:01 PM   #19
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wouldnt that depend on the year of truck it came from? im actually not sure since ive never done an axle swap, just asking.
Possibly, not sure though. I know most people that go offroad would rather no ABS so they can actually lock up the tires when needed. Not sure if the axle even did have ABS, if it would be compatible with the YJ system. Every 8.8 swap I've seen didn't have ABS in the first place so again not 100% positive haha. Just my .02
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Old 02-22-2014, 01:28 PM   #20
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Possibly, not sure though. I know most people that go offroad would rather no ABS so they can actually lock up the tires when needed. Not sure if the axle even did have ABS, if it would be compatible with the YJ system. Every 8.8 swap I've seen didn't have ABS in the first place so again not 100% positive haha. Just my .02
Yup, screw abs. Don't need it, and it's nothing but problems.
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Old 02-22-2014, 04:13 PM   #21
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Yup, screw abs. Don't need it, and it's nothing but problems.
Agreed im glad i dont have it in my YJ
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Old 02-22-2014, 05:27 PM   #22
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Actually the abs on the YJ is the best working one I have ever had. On dry pavement it will still stop on a dime and kick on but on icy roads it works just right. It's far better than my 99 silverado was and I would say it's better then my 11 tundra. All you have to do to turn it off is pull the fuse you can pull the bulb too if you don't want to look at it.

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