Volvo RWD 200 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 9/2004 200 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

ABS Light and symptoms 200 1991

posted by  ACVOLVO on  Thu Jan 28 14:15 CST 2010
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Sep 19 13:15 CST 2014
[RELATED]

On an hour trip home, my ABS light came on, and my speedo quickly started jumping promptly before failing entirely. Added on, I checked my brake fluid which was fine, and codes to which a 3-1-1 popped up.

Any ideas of what to look at first or if anyone has had this happen before?

Before I tell my dad there's a problem, I'd like to at least try and figure this out a bit.

Thank you!








  •   REPLY TO THIS MESSAGE    EDIT   PRINT   SAVE 

    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

    The Bentley manual gives a great set of diagnostics for ABS. Usually the front wheel sensors need to be cleaned because they accumulate small bits of rust which makes the sensor no longer able to pick up a signal. The second major cause is the fuse by the the ABS control unit which should be under the passenger seat.

    The FAQ has a section on ABS which is worth reading.

    Good luck.



    Mark this post as an answer to my question<- Use this feature to mark quality replies to your post.





  •   REPLY TO THIS MESSAGE    EDIT   PRINT   SAVE 

    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

    The 3-1-1 code is "vehicle speed sensor missing". The speed sensor sends a signal to the speedometer and also to the ABS computer. So, either the sensor head has failed or the wiring for it has a fault. It is mounted on the rear face of the differential housing (above the fill plug).

    If you have Bentley manual, see section 460-4.

    John



    Mark this post as an answer to my question<- Use this feature to mark quality replies to your post.





    •   REPLY TO THIS MESSAGE    EDIT   PRINT   SAVE 

      posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

      Bingo - the sensor on the rear diff is both the rear channel ABS sensor *and* the speedometer input. With it flaking out, ABS is confused and the speedometer freaks out.

      The wires flex and bend with every bump and bend, if they are broken or frayed it should be fairly evident when you look at it. If the wires look good, maybe try replacing the sensor. Since it reads the nice oily and clean rear diff carrier, it doesn't suffer from the rust particle contamination that can knock front sensors temporarily out of commission (until you brush the dust off the magnet). If you pull the sensor out of the rear axle and it's got a knot of metal flakes stuck to it, then your diff is probably about to self destruct anyhow. But it's most likely the wires leading to the sensor.
      --
      '63 PV544 rat rod, '93 Classic #1141 245 (now w/16V turbo)



      Mark this post as an answer to my question<- Use this feature to mark quality replies to your post.




<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.