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ABS issues

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.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

98S70T5
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98S70T5

ABS issues

Post by 98S70T5 » Mon Nov 25, 2019 7:44 am

Guys, the ABS light started coming on a week ago in my 98 S70. At first it wouldn't come on until 5-7 mph or so. Now it's just on solid. I was hoping it was a wheel speed sensor based on that. The front two ohm tested ok but it looks like the rears have long wires that go up inside the car. I took the pass through plate off that's over the fuel tank lines (maybe pump). Didn't see a plug there but ran out of time before I could take the passenger side trunk panel out to chase the wires further.

Just looking to see if I am barking up the right tree for the location of the plugs for the rear wheel speed sensors. Haven't been around a OBD tool to hook up and check the ABS codes yet.

It's starting to make ABS noises if you turn fairly spiritedly at 10-20 mph while on the brakes in either direction now.



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abscate
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Re: ABS issues

Post by abscate » Mon Nov 25, 2019 8:08 am

There is a parts change around 1998 when the rear abs harness went from two wires to a one wire harness

You will have to confirm part numbers by comparison or by VIN

I did a DIY with pictures in my 1999 T5, the thread is referenced in my maintenance thread, forum link in my sig


Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

98S70T5
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Re: ABS issues

Post by 98S70T5 » Mon Nov 25, 2019 8:23 am

Cool, thanks for the info. You can see two harnesses going up over the rear axles and disappearing.



98S70T5
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Re: ABS issues

Post by 98S70T5 » Fri Dec 06, 2019 6:00 am

Just tested my rear sensors last night. They are within ohm range and show fluctuation when spinning. Going to need to grab up a code reader of sorts. Hopefully its just a bad wire but my luck its likely the ABS brain/control.

Every once in a while while stopping moderately the car would click in the brake pedal exactly once a second until the car got below 10 mph or so or you let off the brakes. I assume this was it telling my it was on its way out.



scot850
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Re: ABS issues

Post by scot850 » Fri Dec 06, 2019 8:01 am

If it is the ABS module (very common particularly on turbos due to location above the turbo heat) our MVS frined Matty at Mid-West ABS is the man specialising on these Volvo ABS units. Go to his web-site for lots of info.

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

98S70T5
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98S70T5

Re: ABS issues

Post by 98S70T5 » Fri Dec 06, 2019 10:29 am

Thanks for the info! I will get with him when I am ready to repair. Currently burnt out working on this rig. It's constant.



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abscate
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Re: ABS issues

Post by abscate » Fri Dec 06, 2019 10:36 am

The system self tests at low speed, so that might explain the coming on at 5-7 mph. I thought it is a bit faster on mine, like 10 mph, but you can hear the brrrrrp sound when it self test if the radio is off, and the muffler good.

If you get enough failures it will latch and hold an ABS code and stay on, though,

Get a code reader that can read ABS codes and it will point you in the right direction.


Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

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