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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/TRACS FaultViews : 1094 Replies : 21Users Viewing This Thread : |
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Jul 29th, 2022, 04:51 | #21 |
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Location: GUNNEDAH, NSW, Australia
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Re: Luxobargethe: "usual dry solder joints in the ABS ECU" - Yes!!
ABS Module/Control Unit: 4 years ago I re-soldered the 2 big/main posts (to power connector). This immediately fixed the ABS fault. This week, I again received multiple fault codes for open circuit wheel sensors and ABS pump fault. So, I wasted much time swapping wheel sensors without luck. Initially, I was convinced that the ABS Module/Control Unit (ECU) was no longer the problem. As a last resort, I properly de-soldered and then re-soldered all the smaller solder joints (inside the ABS control module). This again immediately removed all ABS fault codes. Note: Dry joints (solder) only occur where the pins (for external wiring harness) are connected to the circuit board. (no other part of the board has problems) Every Volvo of this model has/will eventually have this ABS problem. Caused by faulty manufacture, “Made in Philippines”. Do not waste time on anything else until you have properly repaired the ABS ECU. (If properly de-soldered and re-soldered it should never again cause problems). See Tutorial: https://www.matthewsvolvosite.com/fo...f6426ea4060a29 |
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Jul 29th, 2022, 08:56 | #22 |
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Join Date: Jan 2011
Location: Horne (Nr. Horley)
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As above. I re-soldered mine, and the fault disappeared for a few weeks. Then it came back, and was worse than ever. I delved around down by the plug again, and re-seated the little two-wire plug that carries the power to the ABS ECU, it seemed a little loose and not fully "home". Not a single problem since, and that was months ago.
Just thought I'd mention it, because a bad contact on this plug will give very similar symptoms to a dry solder joint, and it's very frustrating to get the problem back when you've gone to all the trouble of doing the soldering job!
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