abs light flickers on boost

[220bhp]

When my rs2 coupe hits full boost the ABS light flickers. An ideas

[GrantGam]

Hey,

I have the same issue on my ABY S2 Coupe. Clueless also, so looking forward to seeing the replies!

Thanks,
Grant

[Error404]

This will probably be an alternator / voltage fault. IME the ABS is the first thing to fail when voltage drops.

[newsh]

It's warning you that you're going too fast

Could it possibly be that the one-way valve in the vacuum line to the diff lock actuator under the back seat has gone faulty? Does the diff lock still work as it should?

[newsh]

Weird, took the coupe out for a blast, got some boost going and the ABS light came on, it stayed on though and will not reset or go out if car is restarted.

[spink]

I had that one way valve fault on a previous aby I had,mates rs2 used to do it aswell until we changed the valve.

[220bhp]

I have disconnected the diff lock, as it kept cutting in when driving, not nice.
I also plugged the one way valve. I will check it all again . Many Thanks

[newsh]

Mine's fixed with some fuse and plug wiggling!

[GrantGam]

Mine's fixed with some fuse and plug wiggling!

Haha, would you be so kind as to tell me which bits you wiggled and where?

[newsh]

Suggestions as above, fuse in fuse box, relay and connectors under rear seat.

http://www.s2forum.com/forum/showthread.php?p=825423&posted=1#post825423

[220bhp]

I have tried all these things, and I am still getting the ABS warning light on full boost
The front of the car lifts fairly when I plant my foot. Maybe that has some connection.

[Tonybolony]

I had a similar issue with my Ur a few years back, took me Forever to find it, as I assumed a voltage or combi relay (???) fault. Also went through the vacuum piping to difflocks, etc.

It turned out to be a damaged cable to one of the Sensors, and my assumption as to why it only happened on Wot was that only then were the suspension bushes under sufficient strain (in a forward direction) to pull on the damaged section of cable....

Yep, I know it sounds unlikely- but if all else fails.......

[220bhp]

Many thanks I will check the cables

[domas]

had a similar issue once, took me 3years to find it, and I have recently discovered the same in my friends car.

it would disable entire abs system if you shake the car. Sometimes it would work for a month, another time it would not for a year. But driving over a pothole would trigger something.

Long story short: cold joints in ABS combi relay. Re soldered the internals and abs is worky again. I am a proud owner of https://www.google.com/search?q=bosc...w=1920&bih=943 bosch KDAS0003, and no it is not for sale. In case of faulty relay this tester would not be big help.

[220bhp]