ABS light, brake light, DSA light, and no speedometer - Volvo Forums - Volvo Enthusiasts Forum


Volvo S40 The S40 is Volvo's most affordable sedan with all the amenities of a luxury sports car.

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 09-29-2014, 01:32 AM
Junior Member
Thread Starter
 
Join Date: Jan 2014
Posts: 4
Default ABS light, brake light, DSA light, and no speedometer

I recently took my car in for a brake inspection. They said I need new brakes and rotors. Last night I was driving and my ABS light and brake light came on (note surprised) and my speedometer dropped to zero while I was driving. Then, tonight my DSA light came on. I was wondering if the speedometer thing is related to the brake malfunction, or if my car has other issues with the computer?
Reply With Quote
  #2  
Old 09-30-2014, 07:40 AM
Member
 
Join Date: Apr 2014
Posts: 39
Default

I'm willing to bet you have a bad speed sensor, all of those systems rely on signals from the wheel speed sensors for one reason or another.
ABS to detect if a wheel is locked up
DSA to detect individual wheel speeds to compensate and maintain traction
Speedometer...well you get the idea.

I would check to see if the speed sensor or the wire going down to it is still intact and in good shape.
Reply With Quote
  #3  
Old 10-07-2014, 06:13 PM
mf70's Avatar
Senior Member
 
Join Date: Feb 2014
Posts: 265
Default

Quote:
Originally Posted by NFowler View Post
I'm willing to bet you have a bad speed sensor, all of those systems rely on signals from the wheel speed sensors for one reason or another.
ABS to detect if a wheel is locked up
DSA to detect individual wheel speeds to compensate and maintain traction
Speedometer...well you get the idea.
Another poster used the OBD2 port and a Bluetooth dongle to check for correct internal speed signals as a check.
Reply With Quote
  #4  
Old 10-08-2014, 07:54 AM
Member
 
Join Date: Apr 2014
Posts: 39
Default

Quote:
Originally Posted by mf70 View Post
Another poster used the OBD2 port and a Bluetooth dongle to check for correct internal speed signals as a check.
What is a bluetooth dongle? Why wouldn't you just visually inspect the sensor and if it looks ok, then check continuity closed circuit=good open circuit=bad. I would stick to the simple tests rather than trying to decipher a wave signal from a proximity sensor.
Reply With Quote
  #5  
Old 10-08-2014, 02:44 PM
Senior Member
 
Join Date: Sep 2009
Location: Doylestown, PA
Posts: 124
Default

I agree with NFowler, all of that together makes the speed sensor or the wiring from it culprit.

Quote:
Originally Posted by NFowler View Post
What is a bluetooth dongle? Why wouldn't you just visually inspect the sensor and if it looks ok, then check continuity closed circuit=good open circuit=bad. I would stick to the simple tests rather than trying to decipher a wave signal from a proximity sensor.
It wasn't any effort on my part to see whether or not I was getting the speed. I usually have DashCommand open when driving. Speedometer was off and I was still getting readings.


Last edited by TEEKAY; 10-08-2014 at 02:49 PM.
Reply With Quote
  #6  
Old 11-28-2016, 01:10 PM
Junior Member
 
Join Date: Jun 2011
Posts: 27
Default

Hi All,

Picked up a 2001 S40 last night as our spare car. It has ABS and Brake light on. Speedometer and Odometer not working as well.

Check speed sensor first?

Any feedback would be much appreciated. Thanks
Reply With Quote
  #7  
Old 12-02-2016, 08:00 PM
Moderator
 
Join Date: Mar 2012
Location: Ridgefield, CT
Posts: 3,778
Default

check brake fluid level first, then scan for any codes (need a good scanner that can do more than just power train codes). Sounds like it may be the ABS controller board which can develop cracks in the solder joints.
Reply With Quote
  #8  
Old 12-12-2016, 07:46 AM
mf70's Avatar
Senior Member
 
Join Date: Feb 2014
Posts: 265
Default

Quote:
Originally Posted by NFowler View Post
What is a bluetooth dongle? Why wouldn't you just visually inspect the sensor and if it looks ok, then check continuity closed circuit=good open circuit=bad. I would stick to the simple tests rather than trying to decipher a wave signal from a proximity sensor.
Here's what I was thinking of:

ELM327 OBD2 II Bluetooth Auto Car OBD2 Diagnostic Interface Scanner Tool FTSS | eBay

That, combined with a smart phone app like https://torque-bhp.com/, will tell you if the car's internal systems are correctly tracking speed.
Reply With Quote
  #9  
Old 12-19-2016, 07:10 PM
Junior Member
 
Join Date: Jun 2011
Posts: 27
Default

Quote:
Originally Posted by mt6127 View Post
check brake fluid level first, then scan for any codes (need a good scanner that can do more than just power train codes). Sounds like it may be the ABS controller board which can develop cracks in the solder joints.
Hello,

So i've been driving the S40 for a few days now. And what I've noticed at first start up in the morning, the speedo/odometer works for a few minutes and then it stops (lights go back on). It will not work all day til the next morning.

Thinking its time to take out the speed/abs sensors right?
Reply With Quote
  #10  
Old 12-19-2016, 07:12 PM
Junior Member
 
Join Date: Jun 2011
Posts: 27
Default

Quote:
Originally Posted by mf70 View Post
Here's what I was thinking of:

ELM327 OBD2 II Bluetooth Auto Car OBD2 Diagnostic Interface Scanner Tool FTSS | eBay

That, combined with a smart phone app like https://torque-bhp.com/, will tell you if the car's internal systems are correctly tracking speed.
I have this... It works! but doesn't do ABS or Readiness...
Reply With Quote
  #11  
Old 12-20-2016, 07:13 AM
Senior Member
 
Join Date: Sep 2009
Location: Doylestown, PA
Posts: 124
Default

When I posted back in 2014 I waited a year and half before replacing the cluster and that fixed it. I had no ABS / brake lights and the cluster would just stop tracking speed.

If you can confirm that it's tracking speed correctly with ODB2 I would say the cheap fix is to investigate the cluster. The abs bits are a bit more expensive, even used. If you already have the info center goodies hooked up you need a cluster that has the info center also to keep that feature. Also if you have fog lights enabled you might need to re-enable them.

If you have a dice unit. You can monitor the wheel speed of all 4 at once while driving and can see if any of your speed sensors are wonky. Does the ABS light go on right away as soon as you start driving? I believe you need to reach a speed of 40mph before there is enough difference to detect that 1 of the 4 wheel speed sensors is at fault. I had a sensor wrong also which was all crudded up with gunk and was causing my speeds to be reported wrong on the cluster. Even still the OBD speed was accurate.

The abs unit also has a history of getting water into it / having the soldering points go bad and some people will try to heat them up and resolder some fresh stuff but it is usually futile, you end up mangling the box.
Reply With Quote
  #12  
Old 03-22-2018, 10:41 AM
Junior Member
 
Join Date: Mar 2018
Posts: 1
Default 2000 Volvo s40

I have a 2000 s40. My ABS and brake light are on and my speedometer won't work. The shop I took it to said I needed a new ABS system that was expensive, but not necessary. Told me to download an app to monitor my speed. ?????
Reply With Quote
  #13  
Old 03-24-2018, 09:59 AM
Moderator
 
Join Date: Mar 2012
Location: Ridgefield, CT
Posts: 3,778
Default

Go to car-parts.com and look for a yard near you with an ABS unit for a 2000-2004 S40. I paid $60 for mine. If possible get a unit with both the valves as well as the controller. its likely your problem is the controller not the valve body - the controller bolts on to the valve/pump assembly so you can swap that out without opening the brake lines.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
A Few Problems- starting,DSA, and winter mode fadam Volvo S40 6 10-16-2017 06:27 AM
DSA light after brake job john3-16 Volvo S40 0 05-19-2013 11:16 PM
dsa and check engine 1998 s40 t4 oscarray Volvo S40 2 12-27-2012 06:13 PM
DSA Warning light intermitant problem scoobysn7x Volvo S40 0 10-06-2009 08:50 PM
DSA light Genna Volvo S40 1 05-11-2007 06:09 AM


Tags
abs, brake, light, s40, volvo

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Advertising
Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 03:11 AM.


© 2018 MH Sub I, LLC dba Internet Brands
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.