ABS TRACS and Speedo working intermittently

[volvo850R]

Hi guys long time no post!

Im trying to get my 850 R through another mot but it failed because the ABS light is on. It has been on since i disconnected the battery to do some work a while back and it just stayed on since. The ABS & TRACS lights are on all the time but there is also a problem with the speedo as it seems to have an intermittent fault - problem is i can be doing 80mph and the speedo sticks on 30mph for about 30 seconds then all of a sudden it will shoot up to the correct speed, this happens most days. I have done a bit of research and apparently it could be the board on the pump but i want to be certain before taking it off and wanted to know if the speedo indicates a different fault?

Can anybody enlighten me?

[JT]

watching this with interest as I have the same problem!
except my speedo doesn't work at all some times

previous owner thinks you can clear it a code reader??? I doubt it but..........

[stribo]

Sounds like a faulty sensor, i.i.r.c. the 850s get their speedo signal from one of the ABS sensors.

[JT]

I think I have a worn ignition barrel too, which doesn't help! lol

[volvo850R]

Sounds like a faulty sensor, i.i.r.c. the 850s get their speedo signal from one of the ABS sensors.

Yeah i read that somewere but i read it was connected to the actual pump!

[JT]

now you mention it, Still have all 4 sensors on the race car!
i'll swap them over

think of the weight saving?!

[stribo]

now you mention it, Still have all 4 sensors on the race car!
i'll swap them over

think of the weight saving?!

Swap the ignition barrel over as well.

[JT]

Swap the ignition barrel over as well.

that's long gone mate!

[p fandango]

Still have all 4 sensors on the race car!
i'll swap them over

oh no it hasn't lol

[JT]

oh no it hasn't lol

didn't you just have the plugs, not the sensors ??


I'm gonna have to go check now................

[JamesT5]

Check the connection that goes to the ABS module because the ABS/Tracs system runs through there.

[JT]

well
I couldnt get the sensors out of the race car, properly stuck in there
changed the ignition barrel, feels better,
fitted the TT ecu as well

ABS/Tracs lights are still on

and all I have succeeded in doing is bring up the service light!

lol

[stribo]

well
I couldnt get the sensors out of the race car, properly stuck in there
changed the ignition barrel, feels better,
fitted the TT ecu as well

ABS/Tracs lights are still on

and all I have succeeded in doing is bring up the service light!

lol

I've got the draper tool for turning it off, if you can wait until the next softies meet.

[V70 Graham]

.....if you can wait until the next softies meet.

Guess that it's not today then lol

[JT]

cool
not too bothered about the service light, but going nowhere if I cant sort the abs

[stribo]

Guess that it's not today then lol

Umm, no, I think it was at Uxbridge last week.

[T5RatherAmusin]

Was a new abs ecu needed on my old car for these issues

[Harvey]

This might help little bit.

http://www.ipdusa.com/techtips/10035/abs-tracs-codes

[JT]

cheers Harvey
i'll check those reading another day

[JT]

well suspicion got the better of me

went back outside to the car, with the info supplied by Harvey and my meter

front left is the faulty sensor

lets hope that fixes it when a new 1 arrives........

cheers Harvey