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ABS light random and idle question

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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scot850
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Re: ABS light random and idle question

Post by scot850 »

You may have both errors, switch and ABS module. Haven't had the switch cause the speedo to drop out but the ABS senor failing will cause that. Try to see what codes you can pull. If a speed sensor error shows up it will most likely be the ABS module.

When I had a failing module it gave all sorts of weird issues with whole speedo cluster.

A re-built ABS module is a good investment from our good friend Matty Moo at Mid-West ABS. Costs a little more, but he does an exchange process where you can have your module until the new one arrives, swap it and then return the old one. He will need the part number on the module. Go to his web-site for more info.

Neil.
2006 V70 2.5T AWD Polestar tune
2000 V70 R - still being an endless PITA
2006 XC70 - Our son now has this and still parked in our garage
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L - Sold
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - Sold

vovo850
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Post by vovo850 »

No problems with the speedo yet.
It's my understanding when the module goes it's because of cracks in the solder.
Not too hard to reflow solder.
1995 Volvo 850 GLT N/A automatic wagon

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erikv11
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Post by erikv11 »

Agreed, many have the soldering skills (but I don't). But opening and closing the case without butchering it is part of the challenge, check out ways others have figured out how to get that done. Maybe get one from a junk yard to try on. Or get a JY one and swap it in and be done (for a while)!
'95 854 T-5R, Motronic 4.4, 185k
'98 V70, T5 tune-injectors-turbo, LPT engine, 304k, daily driver
'06 S60 R, 197k
'07 XC70, black, 205k
'07 XC70, willow green, 212k
'99 Camry V6 :shock: 153k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k

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abscate
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Post by abscate »

You need a serious solder iron, not a circuit board one, like a 200 watt Weller. It’s about half the price of a good tested unit from Matty
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vovo850
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Post by vovo850 »

I have a nice butane one. I think it's up to the task.
1995 Volvo 850 GLT N/A automatic wagon

Matty Moo
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Post by Matty Moo »

He has a 95, it's a different abs system. It doesn't have the failure issues like the 96 and up.
Image
http://www.midwest-abs.com
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1996 850 Platinum Wagon. ARD Green Tune, OBX.-Gone
1998 s70 ARD tune, EST exhaust, SE/R interior.
1999 s70 Plain Jane.
2000 s70 GLT
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