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Unread 08-24-2009, 10:58 AM   #1
2blu2
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how to disable abs

on 04 WJ 4.7 and keep the speedometer? I pulled the under dash fuse and lost my speedo-not good! any suggestions?

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Unread 08-24-2009, 12:02 PM   #2
tsconver
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can not be done, the speed is read off abs tone rings, so if you kill ABS you loose your speedo. The ABS also controls your front to rear proportionating so you will loose that also if you kill the ABS.
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Unread 08-24-2009, 12:48 PM   #3
MarkoPo
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You can unplug the sensors by the brake caliper and that will disable the ABS and should maintain the speedo.
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Unread 08-24-2009, 01:59 PM   #4
tsconver
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Quote:
Originally Posted by MarkoPo View Post
You can unplug the sensors by the brake caliper and that will disable the ABS and should maintain the speedo.
except it gets the speed signal from the tone ring (speed sensors) on the wheels.
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Unread 08-24-2009, 02:09 PM   #5
StrokedWJ
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People that have done axle swaps say that the speed signal is picked up from the tone rings on the rear axle. You may be able to disable the ABS by only disconnecting the front sensors. It will cause the ABS light to come on, so you'll probably want to pull the bulb...
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Unread 08-24-2009, 02:51 PM   #6
oldfamilyguy
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not 100% sure on this, but I think the vehicle speed comes from the transmission. those sensors at the wheels only tell what speed each wheel is turning. when they are turning different speeds compared to each other and the vehicle speed that activates the abs. anyway it won't hurt to disconnect one and see if the speedo works or not.
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Unread 08-24-2009, 03:27 PM   #7
tsconver
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Quote:
Originally Posted by oldfamilyguy View Post
not 100% sure on this, but I think the vehicle speed comes from the transmission. those sensors at the wheels only tell what speed each wheel is turning. when they are turning different speeds compared to each other and the vehicle speed that activates the abs. anyway it won't hurt to disconnect one and see if the speedo works or not.
you are 100% wrong, speed on a 99 - 04 Grand Cherokee comes from the ABS tone ring on the rears, it will error to the front if the rear is not working correctly.
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A few goodies
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Wife's ride, pretty stock
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http://www.cnc4x4.org/

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Unread 08-24-2009, 04:16 PM   #8
the88thpianoman
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Quote:
Originally Posted by tsconver View Post
you are 100% wrong, speed on a 99 - 04 Grand Cherokee comes from the ABS tone ring on the rears, it will error to the front if the rear is not working correctly.
Correct. This is why we can regear our axles till the cows come home and maintain accurate speedos. Only changing tire size will throw it off.
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Unread 08-25-2009, 10:12 AM   #9
oldfamilyguy
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"100% wrong!" wow I've been told. Anyway I'm happy to be corrected on that, but what about the OP then, how does he disable the abs and keep the speedo?
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Unread 08-25-2009, 10:42 AM   #10
tsconver
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Quote:
Originally Posted by oldfamilyguy View Post
"100% wrong!" wow I've been told. Anyway I'm happy to be corrected on that, but what about the OP then, how does he disable the abs and keep the speedo?
lol ,was just using your I am not 100% sure, meant nothing by it. No way to disable abs and keep the parts you need, even if you pull one of the abs sensors that will disable the abs and the speedo will work but you will loose proportionating control as the ABS computer also controls the front to rear brake bias.

Real question is why does the OP want to disable ABS, there is really no good reason to disable it.
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Speak softly and carry a big stick.

We have room but for one flag, the American flag . . . We have room but for one language, and that is the English language . . . And we have room for but one sole loyalty...and that is a loyalty to the American people. T. Roosevelt 1919

2003 Grand Cherokee 4.0L Laredo

My Build Thread

A few goodies
http://s257.photobucket.com/albums/h...umb55839/jeep/

2001 Kawasaki 1200 ZRX
A few Speed parts, fun to ride
http://www.zrxoa.org/

2006 Red Liberty
Wife's ride, pretty stock
http://i257.photobucket.com/albums/h...mage0008-1.jpg

http://www.cnc4x4.org/

http://www.treadlightly.org/

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Unread 08-25-2009, 11:16 AM   #11
oldfamilyguy
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no worries, honestly always happy to learn what I don't know. and I'm with you on "why do it". maybe theres another way to accomplish what the op wants without actually disabling it
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Unread 08-25-2009, 11:19 AM   #12
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ABS is very bad on the trail, and I notice mine often kicks in too early, when I NEED to stop, but it activates and prevents it. That happened yesterday. Emergency stop maneuver, no stopping! O.o;; I was not happy. Fortunately, the oncoming vehicle managed to avoid me. I could not stop. I'm kind of getting irked that I keep taking my Jeep into a shop to have them check the brakes, and they still don't have the stopping force they should, or used to. Yet everything checks out. Anyhow, even before now they weren't awesomely great at stopping, and the ABS would sometimes prevent me from stopping when I really needed it. However, ABS is there for a reason and a safety measure. If your brakes are in good shape and working better than mine, I imagine it'd not be a great idea to get rid of the function.
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Unread 08-25-2009, 11:52 AM   #13
alexsious
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it preventing you from stopping is its way of allowing you to keep steering on bad terrain. if you REALLY want to get rid of abs, you will probably need to do alot of electrical work to use an older transfer case with the speedo gear in it and get the ecu to properly recognize it. and you would need to swap in a whole new non abs brake system in.
anything is possible if you throw enough money at it!
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