The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

ABS problems 900 1991

posted by  someone claiming to be ibs740 on  Mon Jul 28 05:19 CST 2014 [RELATED]



The ABS isn't working on my 1991 940 turbo wagon. Model plate on rear tailgate claims 940SE.

The ABS light triggers at about 40kph (25mph). ABS works fine below that, tested on wet roads.

I had a bad connection on the rear sensor several months ago and fixed it. The speedo needle quivers a bit sometimes, not sure if speedo issues. I changed the original due to the speedo not working (it was not because of the rear sensor).

Resistance reading for each front sensor static is 1.1K ohms.

The front sensor and toothed discs are newish and very clean.

I get the proper resistance at the ABS controller connector for all sensors so wiring is fine.

The surge relay activates when powered but info in manual is wrong.

My Volvo brake manual hasn't been a great help as it's given some wrong info. and doesn't mention how to troubleshoot for ABS ight at 6mph.

I only have DTC connections for ECU issues, nothing for ABS.

I tried disconnecting both front ABS sensors and measuring the mV after driving 25+ mph. BB FAQ said 50-700mV is typical. On the drivers side I got 0.1mV and zero on the passenger one.

After this testing the ABS error lights at 6mph with all sensors connected.

I noticed a new addition to the FAQ since I printed it. Haven't tried this from (Diagnostic Unit Malfunction: Surge Protector Failure.
[Tip from IO333]

Any help appreciated.
cheers






USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©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.