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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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ABS Woes and MOT due imminently!Views : 506 Replies : 6Users Viewing This Thread : |
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Jan 24th, 2024, 15:39 | #1 |
Junior Member
Last Online: Yesterday 15:27
Join Date: Mar 2017
Location: Banbury
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ABS Woes and MOT due imminently!
Hi all, I've had an ABS light on for a while which tends to turn itself off in very low temperatures (2deg or below) but as my MOT is looking I thought I'd better get it sorted.
First I tried soldering the joints but that just meant the light stayed on at all times so I bought an OBD2 reader and read the codes: ABS-141, 142, 214, 311, 312, 313, 314, 322, 323, 324 Quite a bunch, so I figured my soldering job wasn't up to scratch and tried again today. This time the codes are reduced to: ABS-311 Left front wheel sensor ABS-314 Right rear wheel sensor Does this sound like my re-soldering on the power prongs of the ECU are ok and I have a hardware fault at the front left and rear right sensors or is it more likely I need to open up the unit again and get soldering (again!)? Any of the ECU re-soldering services online say that they only accept a "virgin" unit and I can't seem to buy another unit online anywhere. My 1996 850 T5 is my daily for work so I really can't afford it to fail the MOT - any help would be much appreciated! |
Jan 24th, 2024, 15:59 | #2 |
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Last Online: Jul 28th, 2024 05:52
Join Date: Oct 2008
Location: Sydney Australia
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What is your soldering technique?
I know this is an early unit but the board may have a silicone coating. My advice is get a brass wire brush (like a tooth brush) and give the board a good scrub on the pins. Get some de-solder braid or a tool and work each pin remove the old solder and re flow with lead based solder. and contact cleaner on the connector (not wd40) Last edited by nickm; Jan 24th, 2024 at 16:05. |
The Following User Says Thank You to nickm For This Useful Post: |
Jan 24th, 2024, 16:10 | #3 |
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Last Online: Yesterday 11:31
Join Date: Aug 2020
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Hi liammedler, sorry to hear you've the dreaded ABS light on nightmare. I've had it too.
Seems unlikely that both sensors are faulty at the same time. They may just need a clean and reseating. If that doesn't solve it, it could be the joints may need re-soldering on the module. I've not had to resort to this myself yet, but I can feel it coming soon. A couple of useful threads from fellow members who had the issue too, might be useful for you: https://www.volvoforums.org.uk/showthread.php?t=335591 https://www.volvoforums.org.uk/showthread.php?t=336043 |
Jan 26th, 2024, 15:12 | #4 |
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Last Online: Yesterday 15:27
Join Date: Mar 2017
Location: Banbury
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OK I've had the module apart again and resoldered all of the joints again, to no avail.
The ABS light refuses to go out, even after resetting DTCs using my OBD2 reader and going for a short drive around the block. Do we think it could actually be the sensors? I would have thought clearing the DTCs would have got rid of the light until the car gets back up to 12mph and reads again but in this case the light never goes out. Any ideas? |
Jan 26th, 2024, 15:21 | #5 | |
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Last Online: Jul 28th, 2024 05:52
Join Date: Oct 2008
Location: Sydney Australia
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Quote:
Last edited by nickm; Jan 26th, 2024 at 15:25. |
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Feb 1st, 2024, 09:25 | #6 |
Junior Member
Last Online: Yesterday 15:27
Join Date: Mar 2017
Location: Banbury
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Sorted!
Another check of the pins on the ABS ECU, some more cleaning/solder and an ABS sensor plug that wasn't quite clicked home has sorted it. Such a relief! Now for the MOT ... |
Feb 1st, 2024, 10:51 | #7 |
Senior Member
Last Online: Yesterday 13:03
Join Date: Nov 2004
Location: Portsmouth
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Have you checked the reluctor rings. I had issues with mine as they were corroded and the system could not read the speed of the wheels correctly. New rings and problem solved.
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