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2000 S70 Traction Control Engaging Randomly

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

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bmdubya1198
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2000 S70 Traction Control Engaging Randomly

Post by bmdubya1198 » Sat Mar 07, 2020 5:07 pm

I have one last issue that I'm trying to diagnose with my 2000 S70 GLT before selling, and of course it's with the ABS/STC.
I've only had it happen twice, but while accelerating, STC will engage and the light will flash, killing power. If I let off and wait, it'll stop. My solution the first time was to just turn off STC, which will work obviously but I want this issue fixed so STC works properly.

I checked the wheel speed sensor readings on VIDA while driving, and none of them show any discrepancies worth noting. I cleaned off all the sensors, but after having it happen again today, that didn't help.

I'll double check the tone rings on the front axles, but I know for sure the axle bolts are torque properly. I'm thinking the ABS module may be dying, but figured I'd ask in case anyone else has had this issue.
No codes in VIDA, although I did have an old code for the left rear WSS. It has yet to return since clearing codes a while before I discovered this problem.
2000 V70R Venetian Red/Charcoal M56 Swapped 195k
2000 S70 GLT Mystic Silver/Taupe 253k
2003 S60 2.4T Silver/Black 112k
2007 XC90 V8 AWD Sport Titanium Grey/Black 166k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 173k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

scot850
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Re: 2000 S70 Traction Control Engaging Randomly

Post by scot850 » Sun Mar 08, 2020 9:42 am

I would be doing the same as you. If you have done the tests on the ABS sensors, then the next thing to check is the tone rings like you have said to ensure none have cracked or have a dirt build up on them.

You also mention you have checked all the torque settings of the axle bolts. Being a 2000, as per abscates notes on another thread they are a consumable part and not to be re-used as they are a stretch to yield. He had issues with this in the past I seem to recall.

The only other thing other than a bad ABS module is possibly a broken internal wire in an ABS sensor. I don't think that it would set an error code, because if it did most cars would have loads of codes being set. So unless you are monitoring this when it happens you may not catch it.

A buddy had an issue with the module which he resolved temporarily by pushing a wedge down between the ABS connector at the module and the wires. This was not a 'proper' fix but just proved there was bad joints in the ABS module. He ran the car like that for 2 years.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

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bmdubya1198
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Re: 2000 S70 Traction Control Engaging Randomly

Post by bmdubya1198 » Sun Mar 08, 2020 10:03 am

I believe I replaced the axle bolts, I’m not sure now that I think about it. I usually do, being that they are TTY.

I’ve seen bad wiring at the module, so I’ll definitely check that out, as well as the sensor wiring.
2000 V70R Venetian Red/Charcoal M56 Swapped 195k
2000 S70 GLT Mystic Silver/Taupe 253k
2003 S60 2.4T Silver/Black 112k
2007 XC90 V8 AWD Sport Titanium Grey/Black 166k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 173k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

scot850
Posts: 5764
Joined: Mon Apr 05, 2010 2:46 pm
Year and Model: 2000 V70 R
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Re: 2000 S70 Traction Control Engaging Randomly

Post by scot850 » Sun Mar 08, 2020 12:13 pm

I wish you luck! I remember the nightmare I had with my old 2000 V70 base. Random lights coming on including the STC/ABS/Engine check lights. Took a while to eventually figure out it was the ABS module. I pulled another from a PnP and fitted it. It was also bad but at least the faults were predictable and consistent. That got me on the phone to Matty for an exchange rebuilt unit and issue went away. I am a stubborn Scot who hates to spend money until I am sure I have exhausted the options and am sure the issue is identified to source.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

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Re: 2000 S70 Traction Control Engaging Randomly

Post by wizechatmgr » Sun Mar 08, 2020 5:42 pm

On my '99, I was having intermittent issues that sounded identical to yours. When I monitored VIDA everything was fine and for the life of me I couldn't find the fault. I too spoke with Matty whom suggested the axle bolts or wheel bearings could be an issue. In my case it turned out to be an axle bolt that wasn't tight to spec. My thought is the ABS microprocessor is quicker than VIDA so it may detect and act long before we'll see symptoms on the screen. I think short of having a shorted sensor, no continuity, or one wildly out of spec, it won't likely complain. Your mileage may vary...
Wisdom requires knowledge as a prerequisite, but knowledge can be developed due to a lack of wisdom.
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD - ~187k miles

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bmdubya1198
Posts: 3764
Joined: Tue Dec 30, 2014 10:45 am
Year and Model: 2K V70R M56
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Re: 2000 S70 Traction Control Engaging Randomly

Post by bmdubya1198 » Sun Mar 08, 2020 6:47 pm

Interesting... I'll have to get the front wheels off tomorrow and check it out.
2000 V70R Venetian Red/Charcoal M56 Swapped 195k
2000 S70 GLT Mystic Silver/Taupe 253k
2003 S60 2.4T Silver/Black 112k
2007 XC90 V8 AWD Sport Titanium Grey/Black 166k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 173k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

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