Jeep ZJ ABS Light on, ABS not functional - JeepForum.com
Reply
 
LinkBack Thread Tools
post #1 of 74 Old 11-14-2008, 04:27 PM Thread Starter
compcrasher86
Registered User
1998 XJ Cherokee 
 
Join Date: Nov 2008
Location: Marblehead, MA
Posts: 6,276
Jeep ZJ ABS Light on, ABS not functional

Hey everybody, this is my first Jeep so Im still getting used to it. The ABS light is on and somebody told me if the light was on the system was off. Sure enough I went into a parking lot, layed on the brakes, and the wheels just locked up, no ABS. Where should I look/what should I do first to get it working again?

Its a 97 Grand Cherokee 4wd, 4L Straight 6

Im a big carhead so I dont mind taking parts of it apart, heck, thats why we buy jeeps right?


Last edited by compcrasher86; 11-14-2008 at 04:29 PM. Reason: Fixing info
compcrasher86 is offline  
Sponsored Links
Advertisement
 
post #2 of 74 Old 11-14-2008, 04:41 PM
elmer_fud
Registered User
1995 ZJ 
 
Join Date: Jan 2008
Location: colorado
Posts: 2,457
Quote:
Originally Posted by compcrasher86 View Post
Hey everybody, this is my first Jeep so Im still getting used to it. The ABS light is on and somebody told me if the light was on the system was off. Sure enough I went into a parking lot, layed on the brakes, and the wheels just locked up, no ABS. Where should I look/what should I do first to get it working again?

Its a 97 Grand Cherokee 4wd, 4L Straight 6

Im a big carhead so I dont mind taking parts of it apart, heck, thats why we buy jeeps right?
I would start by checking the fuses, and checking the wheel speed sensors. maybe one of the sensors wiggles loose.

Brian
95 ZJ, 5.2 V8,160,000 miles
Colorado Jeep Club member Pi
Quote:
Originally Posted by Speedycat View Post
I am not one to be changing lanes at 70 mph on a lifted truck on 33's, but since I am in Miami, I have to be prepared for the continuous influx of new drivers whose previous ride was a bicycle with wooden wheels.
Quote:
Originally Posted by FPKites View Post
badger, badger, badger, badger, badger, badger, badger, badger, badger, badger, badger, Mushroom!!! :D
Quote:
Originally Posted by ZeeJay1997 View Post
Or just tie a 12 lb fish to a one foot pipe.
elmer_fud is offline  
post #3 of 74 Old 11-14-2008, 04:46 PM
dxmedia
Registered User
1996 ZJ 
 
Join Date: Oct 2008
Location: Sheffield UK
Posts: 105
Take a resistance reading from each sensor on the wheels, the odd one out will need replacing. If they are all the same then it's going to be a broken wire / or a faulty abs ECU.

My money is on either one of the front wires being broken with someone taking off the hub and pulling the wire or a faluty sensor.

I've not had a good look at a jeep, so talking about cars in general.
dxmedia is offline  
post #4 of 74 Old 11-14-2008, 05:01 PM Thread Starter
compcrasher86
Registered User
1998 XJ Cherokee 
 
Join Date: Nov 2008
Location: Marblehead, MA
Posts: 6,276
I checked three fuses, two were big maxi fuses next to the battery (ABS Valve and ABS Pump) and the third was a small maxi fuse in the passenger side under dash. All of them were intact and good. Its too dark/Late to be taking off tires tonight so Im going to have to wait until tomorrow to do that
compcrasher86 is offline  
post #5 of 74 Old 11-14-2008, 07:40 PM
jabsther
Registered User
2010 JK Wrangler 
 
Join Date: Jan 2008
Location: Cape Cod
Posts: 447
Recheck the small fuse in the passenger side again. I had the same problem and all the fuses were good. Cleaned the contact posts on the fuse and it has worked great for years now.
jabsther is offline  
post #6 of 74 Old 11-14-2008, 11:13 PM Thread Starter
compcrasher86
Registered User
1998 XJ Cherokee 
 
Join Date: Nov 2008
Location: Marblehead, MA
Posts: 6,276
jabsther I wish it was that easy. I checked the fuse, scraped the posts down a little bit (they were quite dirty!) and cleaned with electrical contact cleaner. Put it back, turned the key, crossed my fingers. and the light still stayed on. Guess Im checking the sensors tomorrow... can I get at them without taking the wheels off? it would probably make my day a fair amount easier.
compcrasher86 is offline  
post #7 of 74 Old 11-14-2008, 11:57 PM
elmer_fud
Registered User
1995 ZJ 
 
Join Date: Jan 2008
Location: colorado
Posts: 2,457
Quote:
Originally Posted by compcrasher86 View Post
jabsther I wish it was that easy. I checked the fuse, scraped the posts down a little bit (they were quite dirty!) and cleaned with electrical contact cleaner. Put it back, turned the key, crossed my fingers. and the light still stayed on. Guess Im checking the sensors tomorrow... can I get at them without taking the wheels off? it would probably make my day a fair amount easier.
yes. If you look behind the brake, there is a tone ring ( a ring with lots of teeth on it). By this ring there should be a black plastic thing and this is the sensor.

Brian
95 ZJ, 5.2 V8,160,000 miles
Colorado Jeep Club member Pi
Quote:
Originally Posted by Speedycat View Post
I am not one to be changing lanes at 70 mph on a lifted truck on 33's, but since I am in Miami, I have to be prepared for the continuous influx of new drivers whose previous ride was a bicycle with wooden wheels.
Quote:
Originally Posted by FPKites View Post
badger, badger, badger, badger, badger, badger, badger, badger, badger, badger, badger, Mushroom!!! :D
Quote:
Originally Posted by ZeeJay1997 View Post
Or just tie a 12 lb fish to a one foot pipe.
elmer_fud is offline  
post #8 of 74 Old 11-15-2008, 06:24 AM
newfieZJ
Registered User
1995 ZJ 
 
Join Date: May 2008
Posts: 6,557
The first thing I would do , is disconnect the ABS from it`s control module on the d/s fender well . Check for ANY corrosion , the , on the female side , using a small pointed screw driver , close each inlet so the male end gets a better connection , there`s a few . Use some dielctric grease and snap it back together .
This worked for a friend after he was quoted $2500 for the repairs , no problems for a yr now . Oh , btw , he had a 97 like yours !
Cost was ZERO , if you have the grease , so worth trying
newfieZJ is offline  
post #9 of 74 Old 11-15-2008, 08:27 AM Thread Starter
compcrasher86
Registered User
1998 XJ Cherokee 
 
Join Date: Nov 2008
Location: Marblehead, MA
Posts: 6,276
yes I have the grease and boy oh boy is there some corrosion spots around the engine, (grandma liked to drive her through big big puddles) so I wouldnt doubt it hitting the abs controller. Last nigh I disconnected the ABS Sensor cables under the rear seat in the car and tested the OHM between the two wires. (That theoretically should work right?) Anyways, both were reading around 9,000OHM (Im using my new digital one today) so I assume those two are fine?
compcrasher86 is offline  
post #10 of 74 Old 11-15-2008, 08:39 AM Thread Starter
compcrasher86
Registered User
1998 XJ Cherokee 
 
Join Date: Nov 2008
Location: Marblehead, MA
Posts: 6,276
Okay Im still having troubles finding the control unit. My buddy tells me that the 1997-1998 dont use an ECU, but in fact a Hydraulic Control Unit (HCU) mounted near the CAB or something. I still dont see it.....
compcrasher86 is offline  
post #11 of 74 Old 11-15-2008, 08:58 AM
newfieZJ
Registered User
1995 ZJ 
 
Join Date: May 2008
Posts: 6,557
he`s right , it`s called a HCU , an all in one unit . It`s got to be all in the same area , d/s fender/firewall area . Still looking till someone chimes in
newfieZJ is offline  
post #12 of 74 Old 11-15-2008, 09:01 AM
newfieZJ
Registered User
1995 ZJ 
 
Join Date: May 2008
Posts: 6,557
Remove neg battery terminal
remove air cleaner assembly
remove windsheild washer bottle

this should give you access to the HCU plug in
newfieZJ is offline  
post #13 of 74 Old 11-15-2008, 10:01 AM Thread Starter
compcrasher86
Registered User
1998 XJ Cherokee 
 
Join Date: Nov 2008
Location: Marblehead, MA
Posts: 6,276
Alright, I think I found it, There were two plugs going into it, one with many wires and contacts, and then one with two thicker wires that appeared to power what looks like the pump. I cleaned it (wasnt really dirty to start with but whatever) and plugged the connnector back in, and tried turning the key... no luck.

I also traced the wires from the front speed sensors up into the engine compartment and I found little connectors inline, where I was able to measure the resistance. So with my new digital multimeter, heres the readings I am getting. FL=1,077; FR=1,070; RL=1,049; RR=1,063. They all seem fairly close so I am guessing the speed sensors are not the problem, unless they all are failed and I have trouble beleiving that.

Also, now that I know where the ABS controller/Pump is, I was able to listen to it. I had my brother turn the key to "On" and I listened. From that area, (pretty sure it was coming from the pump), I heard a faint buzzing sound for a second. Then it stopped, clicked a couple times, and then nothing.

Heres a photobucket album of today's work: http://s45.photobucket.com/albums/f8.../Fixing%20ABS/

I wish I could post img tags but I cant yet, have to wait till 25 posts, sorry
compcrasher86 is offline  
post #14 of 74 Old 11-15-2008, 10:07 AM
-Joe-
Registered User
 
-Joe-'s Avatar
1995 ZJ 
 
Join Date: Jan 2005
Location: Lexington, KY
Posts: 4,634
I know it probably would not be free but why not just have someone check the abs codes and forget the random checking?

I wonder what the dealer would charge for the diagnostic

- Joe -

'95 Jeep Grand Cherokee Laredo I6 4.0L
242TC - Extreme Engineering 2" Front Lift/1.75" Rear Lift - ES9000 Shocks + JKS BPEs
Moog Cargo Control Springs
Magnaflow Converter - Dynomax Muffler
235/75/15 AT Uniroyal Liberator Tires
-Joe- is offline  
post #15 of 74 Old 11-15-2008, 10:16 AM
newfieZJ
Registered User
1995 ZJ 
 
Join Date: May 2008
Posts: 6,557
you should also know that tha ABS WILL NOT CLEAR MEMORY by disco`ing the battery , but will after 50 starts or cleared by a code reader , most likely a dealer job .
newfieZJ is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
1997 zj non infinity tweeter wires functional? benspilk09 ZJ Grand Cherokee Forum 2 02-05-2009 07:19 PM
Erratic Idle + Not functional Cruise (intermittent problem) mz3bo ZJ Grand Cherokee Forum 11 05-21-2007 10:50 PM
Check engine light on. Jeep Off. skidmark421 ZJ Grand Cherokee Forum 1 03-02-2007 04:53 AM
Built myself a multi-functional trunk box...Check it out! (>56k suggested) wino_ii ZJ Grand Cherokee Forum 5 03-25-2006 12:55 PM
AX-15 conversion is functional! Woody ZJ Grand Cherokee Forum 24 01-16-2006 09:16 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome