Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: Alca on February 27, 2009, 01:18:12 PM

Title: ABS Light on, 1996 Grand Cherokee Ltd
Post by: Alca on February 27, 2009, 01:18:12 PM

1996 Grand Cherokee Ltd 4.0ltr LPG

ABS light on.

When switching ignition on the ABS light comes on and does not go out until switching off again. (No special reason I can give, it just came on one day and that was it)
As I understand it (from a previous post that Mike P answered) if it does not go out before you move off then this is a short or broken connection and maybe not a sensor fault.

I have checked all the sensors and I get the same resistance reading by disconnecting and reading across the wires which does not show a short to earth.

I have also replaced the control unit (in Passenger foot well) with a spare but the light is still on.

Checked all fuses and relays. (By swapping with others)
I am now at a loss what to check next.

The questions I have are:
1)   If you find the fault, will the ABS control unit/light reset itself?
2)   If not can you reset the unit with or without a scanner. (If so what type?)
3)   How much info can the dealership give if they scan the system (I don’t need them to tell me its not working,)

Can anybody suggest other things I need to look at, all ideas gratefully received.
What normally goes wrong with the ABS.?

Title: Re: ABS Light on, 1996 Grand Cherokee Ltd
Post by: Mike Pavelin on February 27, 2009, 03:55:24 PM

If the light stays on it could be the controller (which you have already changed) teh Hydraulic Control Unit (the bit with the pump in the engine bay) a wiring fault or a fuse. The light should go out if you fix the fault or erase the codes from the controller. If you get a dealer to scan it you should get a specific indication of where the fault lies.

Title: Re: ABS Light on, 1996 Grand Cherokee Ltd
Post by: Alca on February 27, 2009, 06:19:16 PM

Thanks for answers Mike, how do I erase the code from the unit to know if I have fixed the fault?