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-   -   1994 Audi Coupe 2.0e ABS issues (http://www.classic-audi.co.uk/forum/showthread.php?t=38546)

m50yre 09-11-18 10:40 AM

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:

Ben 09-11-18 11:07 AM

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:

m50yre 09-11-18 11:16 AM

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

m50yre 09-11-18 11:28 AM

2 Attachment(s)
Attachment 11205

Attachment 11206

Mellis46 09-11-18 11:55 AM

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

Ben 09-11-18 01:22 PM

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

Quote:

Removing and installing combi relay
Location:
Front left, beneath instrument panel in auxiliary relay plate
=> Current Flow Diagrams, Electrical Fault Finding; Fitting Locations
Note:
Switch off ignition for removal and installation. Not applicable as of model year 1993.
So you don't have one to check. It also says about the ABS ECU:

Quote:

Prior to removal on vehicles as of model year 1993 interrogate fault memory with fault reader -V.A.G 1551-.
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:

mikes2 09-11-18 01:31 PM

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

m50yre 09-11-18 02:22 PM

Thanks guys. Nah light stays on. Itís not turned a wheel for over ten years so I do wonder if once itís had a drive itíll sort itself out. Iíll keep you posted.
Cheers

Mellis46 09-11-18 03:03 PM

Good luck :)

m50yre 10-11-18 01:03 PM

Quote:

Originally Posted by Ben (Post 451254)
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:

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


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