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abs light is on..how to check??

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Old 01-19-2009, 09:57 AM   #1
6sphere
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Default abs light is on..how to check??

After I had my gears put in, there has been a pulsing in the brake pedal when I slow down. It really only happens when I get in the lower speeds like 10mph and lower. Over at StangNet someone mentioned that it could be the rear rotors.

Now my abs light is on. It never came on before I had the gears put in, now it will come on every once in a while, especially when im on the highway. It came on today when I got on the highway and another time as well. And whats weird is when the light is on, my brake pedal doesn't pulse when I slow down.

How can I check the code? Im gonna try with my xcal 2 after posting this, so we'll see if it works or not.
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Old 01-19-2009, 11:02 AM   #2
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Xcal didn't work...
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Old 01-19-2009, 03:41 PM   #3
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Its not a CEL its your ABS sensor, check to make sure they didnt unplug one of your ABS sensor's, or or could be loose, or it couldnt be related and your brakes need replaced.
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Old 01-19-2009, 03:43 PM   #4
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If it started after the gears, the installer probably damaged the sensor where it goes thru the axle housing. They get seized in there and take some manipulating to get out. Yank the rear wheels and inspect the senors for damage and make sure hey are seated all the way in
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Old 01-19-2009, 06:57 PM   #5
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My ABS light came on after I got done putting my springs in on it's test drive. I put it up for the winter right after I did it and I havn't gotten time to look into what happend to make it come on because it has been too cold out. But I'm guessing I did something with one of the cables.

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Old 01-19-2009, 08:59 PM   #6
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I went to the place I took it too and told them about it. They said to drop it off sometime and they'll check it out.
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Old 01-19-2009, 09:06 PM   #7
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to do the gears you have to pull the axles and to push the axles in to get the c clips out you have to at least loosen the abs sensors and pull them out a little (or all the way out whatever floats your boat), they probably didn't put them all the way back in which is why your abs is activating. you could check it with a scan tool, monitor which abs sensor isn't responding.
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Old 01-19-2009, 09:26 PM   #8
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I'll tell them about the abs sensors. I still dont understand why the brakes pulse. They had to take the rear ones apart to do the install so maybe they did something wrong putting them back on.?
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Old 01-19-2009, 09:30 PM   #9
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I'll tell them about the abs sensors. I still dont understand why the brakes pulse. They had to take the rear ones apart to do the install so maybe they did something wrong putting them back on.?
where did you get them from? check to see if they are warped. we sometimes have problems at our shop with napa brand and advanced auto products but they are covered under warranty.
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Old 01-19-2009, 09:38 PM   #10
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when you say pulse does the pedal feel wierd or does it feel like the brakes are warped (feel a vibration in your seat).

if they messed up or didn't install a sensor all the way in, the abs module will see a differential in wheel speed which tells it a tire has lost traction and will cause an abs stop, which would also explain why your abs light is on.
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Old 01-19-2009, 10:09 PM   #11
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Make sure the exciter rings are still in one piece too....
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Old 02-02-2009, 09:22 AM   #12
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when you say pulse does the pedal feel wierd or does it feel like the brakes are warped (feel a vibration in your seat).

if they messed up or didn't install a sensor all the way in, the abs module will see a differential in wheel speed which tells it a tire has lost traction and will cause an abs stop, which would also explain why your abs light is on.
When I slow down to like 10mph, you can hear a noise near the trans and the pedal will pulse with the noise. The pulse kinda does feel like abs is activating. It doesnt feel like the brakes are warped or anything bad.

Now when the abs light is on, its disables abs right? Cause when its on the pedal doesnt pulse and that noise is gone. Im going to drive over to the dealership to see if they can read the code after class.
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Old 02-02-2009, 09:46 AM   #13
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When I slow down to like 10mph, you can hear a noise near the trans and the pedal will pulse with the noise. The pulse kinda does feel like abs is activating. It doesnt feel like the brakes are warped or anything bad.

Now when the abs light is on, its disables abs right? Cause when its on the pedal doesnt pulse and that noise is gone. Im going to drive over to the dealership to see if they can read the code after class.
Is your light goin on and off? Why havent you taken it to the installer yet to get it checked out.. If its pulsating with the light off, and when you have the light on and it doesnt do it, then its def. a ABS problem.
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Old 02-02-2009, 10:18 AM   #14
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Is your light goin on and off? Why havent you taken it to the installer yet to get it checked out.. If its pulsating with the light off, and when you have the light on and it doesnt do it, then its def. a ABS problem.
I really havent had time to drop it off. My other car is currently non operational so I need this car. I'll try and get it dropped of today.
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Old 02-05-2009, 11:41 AM   #15
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So I took my car to the shop yesterday. I came back today and they said all they had to do was reset it. I drove the car and the pedal was still pulsing. I went back inside and told them it was still pulsing and explained everything to them again. One dude took it for spin and came back understanding what was going on.

The shop said they hooked it up to their scan tool and no codes were found. All the wheel speed sensors were reading fine according to them. I asked if I could get the light to come on if they could scan it again for me. I took the car on the highway and the light came on. Went back to the place and he scanned it again with their Matco scanner. Said no codes were found.

Im downloading the FSM now and i'll try to troubleshoot the problem myself.
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Old 02-05-2009, 12:54 PM   #16
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It hard to trouble shoot a problem with no codes to go off. Do you know any friends at Ford? Our scan tool (IDS) is capable of reading codes that other scanners cant. Its a manufacturer thing. They deliberately make codes that you have to bring it to Ford to read.. Does that make sense?

If you know the rotors are good, and the vibration you feel is in the pedal (sorta has a buzzing type feel/sound) then it sounds like you could have one sensor not reading the same as the other. If one sensor is off even ~2mph from the other side, it can freak out the ABS. Also, just because the sensor is reading, doesnt mean they are reading the same #s. This may be a dumb question, but you have 2 of the same tires on the rear of the car right? And the tire pressures are equal? What about the front??
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Old 02-05-2009, 12:58 PM   #17
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Also, pull the fuse for the ABS (2.29 15A under the dash)

Your light should stay on, now drive the car and see if the pedal still pulses
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Old 02-05-2009, 01:10 PM   #18
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My uncle works for for the financing part of Ford so maybe he knows someone at a dealership who can scan it for free. They wanted $100 when I went there a few days ago.

Im going to test the sensors out back when the FSM gets finished downloading. I still think one of them is damaged.

And I have the abs module fuse under the hood pulled so the pedals wont pulse (which they dont when the fuse is pulled). Should I just pull the one under the dash or am I fine?
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Old 02-05-2009, 03:31 PM   #19
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On a related noted, I recently had to get my abs module replace, and I was just wondering what the chances were that some jackass intentionally broke it so he wouldn't have to turn the traction lock off every time he started the car.
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Old 02-05-2009, 06:20 PM   #20
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On a related noted, I recently had to get my abs module replace, and I was just wondering what the chances were that some jackass intentionally broke it so he wouldn't have to turn the traction lock off every time he started the car.
I doubt it. You can just pull the fuse and it will disable T/C every time.
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Old 02-05-2009, 06:20 PM
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