S70 1998 Speedometer not working.

roscoerich · Post by **roscoerich** » 20 Feb 2010, 00:28

I have a 98 volvo s70-My speedometer and odometer obviousley connected sometimes works and sometimes not. Whats the first thing to look at to solve this problem. Much appreciation for any advice.

Post by **charlyW** » 20 Feb 2010, 03:52

Check to see if your car has a speed sensor or is it a wired version like older cars? If it's electronic try changing the speed sensor

Post by **Ozark Lee** » 20 Feb 2010, 05:01

Is your ABS light on? Does the ABS light even come on when the key is in position II before the car starts?

The S/V series speedometer is more robust than the 850 series but the speed signal comes from the ABS module which is a known problem on all of the cars from '96 and on.

...Lee

FCPEURO · Post by **FCPEURO** » 20 Feb 2010, 08:20

If the ABS light is not coming on and is working correctly, it could be a short in the gauge cluster itself. Like Lee said, they are more robust but that does not mean they are bullet proof.

roscoerich · Post by **roscoerich** » 20 Feb 2010, 09:40

Yes the ABS light has always been on. Should I still check the speed sensor and where exactly would I locate it? Thanks for your help.

Post by **jblackburn** » 20 Feb 2010, 09:45

There is a transmission speed sensor on a -70 series car but it only controls the shifting patterns, and not the gauges. Your problem is the ABS module that needs to be repaired and has finally conked out on you. The speedometer signal comes through the ABS module from the ABS sensors at the front wheels.

The problem with the modules is the solder joints come undone. If you're any good with a soldering gun, you can easily fix the module yourself.
https://www.matthewsvolvosite.com/forums ... hp?p=46827

Or, pull it out and send it off to Vic Rocha for $100-something
http://home.earthlink.net/~vicrocha/Vol ... emoval.htm

roscoerich · Post by **roscoerich** » 20 Feb 2010, 15:35

Thanks! I will give it a try myself! Fine without knowing has fast I am going all the time for now$$$$$

Paramedic · Post by **Paramedic** » 20 Feb 2010, 15:46

I had the same problem on my 98 S70, did the repair to the solder joints on the ABS unit 6 months ago & it's been working fine ever since. I've read somewhere that if the ABS light is on for a period of time the speedo will eventually stop working. Hope the repair works for you & get yourself a good quality E5 Torx socket to undo the screws holding the ECU to the modulator

Good Luck.

roscoerich · Post by **roscoerich** » 20 Feb 2010, 16:07

Thanks Doctor. My wife and I are having our wedding reception tonight and she is making me take a shower! Boo! Jk I will give it a shot next week. Thaks again.

Post by **polskamafia mjl** » 20 Feb 2010, 16:58

roscoerich wrote:Thanks Doctor. My wife and I are having our wedding reception tonight and she is making me take a shower! Boo! Jk I will give it a shot next week. Thaks again.

Congratulations!