1994 Audi Coupe 2.0e ABS issues
 

Hi guys.
Wonder if you can help.
I have been fixing up an 80 Coupe for the past couple of years. Its now ready for MOT but i cannot get the ABS light out. Now all brakes have been removed, renewed, subframe off etc so everything is new. I cannot remember if the light was on when i got it, as it didnt run.

Ive had it on VCDS and the ABS controller cannot be communicated with.

Ive checked the ABS ECU and and got a spare to try that but makes no difference.

Only thing i can find is that the ABS ECU only gets a 6v feed - without a diagram im not sure if thats enough or if the only feed required?

Any thoughts? :wall:

Have you checked the fuse on the ABS relay? it's located under the dash behind the ign switch:

http://www.brita.plus.com/80q/DSCF9744.jpg

I've had a relay die, which is why I have a photo of one :tup:

Hi, i saw this on another forum so went looking for that relay, but cannot find it, do all Coupes have them? Cheers

Attachment 11205

Attachment 11206

If its not where Ben said that ABS relay also can sometimes live under the back seat...

Looking through some Audi B4 pdf's, it states (for LHD):

So you don't have one to check. It also says about the ABS ECU:

I put the pdf here if you want to have a read up: http://www.brita.plus.com/80q/FWD_Running_gear.pdf right click the link to download :tup:

For a 94 car, there is no relay. It's all contained in the ecu under the rear seat.

If you start the car up, the ABS light should go off within 5 seconds. If it doesn't it's likely a pump / modulator fault since you've already swapped the ecu.

There are 2 relays in the modulator which can be swapped out

Thanks guys. Nah light stays on. It’s not turned a wheel for over ten years so I do wonder if once it’s had a drive it’ll sort itself out. I’ll keep you posted.
Cheers

Good luck :)

Thanks for the pdf. VCDS cannot read my ABS, is that normal? I had a 95 one years ago and I’m positive Vagcom could read abs on it?