Topic: ABS Light Again (Read 5965 times)

steve.wickes · « **on:** July 14, 2006, 06:25:03 PM »

Just come back off me Hol's and got in the XJ for the first time in three weeks.

ABs light is staying on. I think that the ABS is working as I have done the test suggested in my previous post about this.

Has anyone got any suggestions as to where to start looking for causes to the problem.

Anonymous · « **Reply #1 on:** July 14, 2006, 06:35:07 PM »

Check the connections on the wheels?

Mike Pavelin · « **Reply #2 on:** July 14, 2006, 06:39:48 PM »

Sit in the Jeep. Ignition on. The light should come on then go out. Start the engine. The light will either stay out, or may come on then go off again. If the light stays off but comes on when you start driving, it's usually a wheel sensor problem. The ABS will not work when the light is on. If it does, you might be looking at the wrong light.

JamesH · « **Reply #3 on:** July 14, 2006, 06:40:06 PM »

There are two fuses in the under-bonnet box for the ABS motor / pump and a relay for the warning light. You could check these along with the sensors fairly easily to start with.

Or you could just take them all out to get rid of the ABS and have a normal brake system :wink:

steve.wickes · « **Reply #4 on:** July 15, 2006, 02:13:36 PM »

Getting slightly confused now!!!!! :smt102

When I turn the ignition on, the light stays on. It does not go out when I start the engine, just dims a bit as the starter motor kicks in.

I have pulled all of the fuses and relays under the bonnet that relate to the ABS out and the light still stays on. I am assuming that this is because a fault has been detected, but I would have expected the whole system to shut down (including the warning light) if all the fuses were out.

Also, I have managed to locate the sensors on the wheels, and have traced the cables as far as I can, but I can't find the connections. Clues please.

Is it OK to take the sensors off of the wheels and clean the faces to see if this solves the problem?

Anonymous · « **Reply #5 on:** July 15, 2006, 02:27:02 PM »

Steve

plug locations:

both rears enter the monocoque under the rear seat passenger side & plug into a module

fronts go thro inner wing up into engine bay, drivers side plug will be somewhere around the brake servo, pass side somewhere around washer bottle (assuming yours is pre-95)

take em off, give em a clean, you shouldnt need to take the whole loom out, just undo the bolt that holds em to the hubs, clean em & stick em back in......

have you checked the wires to make sure one isnt rubbed thro??

steve.wickes · « **Reply #6 on:** July 15, 2006, 02:30:29 PM »

Thanks KD. I'll finish this cup of tea and go have another look. Do I just clean the faces of the sensors?

Anonymous · « **Reply #7 on:** July 15, 2006, 02:33:31 PM »

Mike Pavelin · « **Reply #8 on:** July 15, 2006, 02:41:25 PM »

You're wasting your time cleaning them. If it was crap on the sensors, the light would go out on startup, and come on once the vehicle starts moving. Chances are, if there's no blown fuses, and no visible wiring damage, it's a fault with the ABS controller. Try disconnecting the battery first to clear it in case it's thrown a wobbly.Otherwise you need a DRB III scan tool to interrogate it and get fault diagnostics for it. Off to the Jeep dealer.

steve.wickes · « **Reply #9 on:** July 15, 2006, 03:22:01 PM »

No visible wiring damage and all connectors seem good. Could this be caused by low brake fluid or tyre pressures?

steve.wickes · « **Reply #10 on:** July 15, 2006, 05:43:26 PM »

Ok Guys, now I'm totally confused. Did a search through the forums and came up with this http://http://www.birtydastardsjeepclub.com/forum/viewtopic.php?t=1012
This seems to say the opposite of what Dr Mike is saying.

Also, I have looked through the various manuals that I have on CD and the dreaded Haynes Manual. Each one gives me a different location for the CAB (Control Anti-Lock Brakes). One says to the right of the steering column under the dash, one says attatched to the power steering pump/motor and Haynes says under the rear seat ](*,)

Mike Pavelin · « **Reply #11 on:** July 15, 2006, 09:59:08 PM »

What year and model Jeep do you have?

skip · « **Reply #12 on:** July 16, 2006, 01:35:48 AM »

My old rover used to eat ABS sensors, always the same one. but that aside I found that wheel sensors can easily be tested with a multimeter. find the connectors for them and pull them apart and set your multimeter for 20k ohms and see what you get, usually around 15k-16k. make a note of all four, the odd one out will be obvious by the difference. mostly infinite resistance or hugely higher than the others indicating a break in the circuit, small variations should be expected. Good luck.

steve.wickes · « **Reply #13 on:** July 16, 2006, 11:09:04 AM »

Quote from: "Mike Pavelin"

What year and model Jeep do you have?

Mike , It's a 1993 XJ Limited

Mike Pavelin · « **Reply #14 on:** July 16, 2006, 04:51:36 PM »

The manual says the controller is under the steering column, but RHD might be different.

steve.wickes · « **Reply #15 on:** July 16, 2006, 05:27:24 PM »

Thanks Mike. I guess I've got a bit to keep me occupied in the evenings when I get home from work now.

Author Topic: ABS Light Again (Read 5965 times)

steve.wickes

ABS Light Again

Anonymous

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JamesH

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