ABS control unit repair - Page 2

Nightshade · Apr 15th, 2010, 20:50

Thanks to everyone who has contributed to this thread regarding faulty ABS control units. Recently I followed the advice and clear guidance on removal, opening and repair to poorly soldered joints, particularly the ones associated with connections to wiring loom and power supply. Close inspection revealed stress fractures, rather than dry joints to at least eight of these connections - probably the result of pushing the connectors onto the unit when first assembled (I doubt whether fretting corrosion through vibration would have caused this problem). Having previously spent in excess of £350 having a new camshaft speed sensor and two front ABS sensors fitted on the trial an error approach adopted by my local garage, I took the plunge and bought an inexpensive code reader that returned code P1633 and subsequently led me to this thread. After several weeks of intermittent ABS warning lights, flashing limp mode arrow, engine warning lights and occasional loss of the speedometer function, my C70 2.5t GT now runs free of warning lights and with full bhp on tap. Thanks again.
Next job - unreliable aircon that blows warm when set to blow cool!

cyclogenesis · Apr 25th, 2010, 10:39

I carried out the unit repair some time ago, but was still getting faults. Took the plunge and replaced the reluctor rings which have solved my issues. Before and after pics attached!

The rust and crud was confusing the system, registering a fault. Nice clean teeth, no fault!

sweeney110 · Jul 7th, 2020, 10:56

Quote:

Originally Posted by bobcat

I have repaired my own ecu, very simple just remove the lid and resolder the solder joints on the plugs. will take about 1-2 start to finish.

Hello there. New to the forum. Have any of you guys tried this on a newer car?
I've a 2008 v50. Anti skid warnings.

Is it worth a go with that or am I getting into dodgy territory?

Just got a quote of £250 from ecu-testing for it. I'd rather not pay that if I can sort it on the bench myself.

Thanks

amazondean · Jul 7th, 2020, 11:45

I’m not sure about the newer cars, they may have different issues. I have managed to repair a few myself now, but it does involve a bit of patience. I have found that I need to look through a large magnifying glass while I re-solder the joints, as it’s not until you look through a glass that you See the borders you need to keep within. Also the post you mention says “just remove the lid”. This in itself can be a little tricky if you haven’t done it before, as it needs to be cut off with the help of a hacksaw. You can make a neat job if you know how to remove it but I am talking about the 850, v70/c70 models.

RollingThunder · Jul 7th, 2020, 11:51

Quote:

Originally Posted by sweeney110

Hello there. New to the forum. Have any of you guys tried this on a newer car?
I've a 2008 v50. Anti skid warnings.

Is it worth a go with that or am I getting into dodgy territory?

Just got a quote of £250 from ecu-testing for it. I'd rather not pay that if I can sort it on the bench myself.

Thanks

I had this on my 2007 S40 D5 a few weeks ago - 'Anti Skid Service Required'. It turned out to be the ABS pump itself in my case, nothing electronic. The fault logged related to the brake pressure sensor switch, but that text error is generic can mean a lot of things - you need to see the actual fault code to identify the issue

johnnyturbo2002 · Apr 18th, 2007, 20:43

Yes I have and it was fast and easy..and best yet, cheap!
Victor is extremely professional and I would recommend him very highly. He is also interested in other electrical problems that we volvo owners might have so if there are any extra parts with a reoccuring problem we should give him a shout andsee what he has to say. I'd say do it if you haven't done it already.

britten_mark · May 2nd, 2007, 21:28

I'm tempted to try this after being lifted for 90 quid by an auto electrician to tell me all the wheel sensors were OK.

The only thing that worries me is cutting the case; some pics would be wonderful. Also if I do this and do not cure the light does that mean I can't then take advantage of the £100 reconn'ed units as they presumably want an undamaged exchange???

Owen850 · May 2nd, 2007, 21:49

People, I have an ABS unit from my 850 breaker left in the garage so if anyone makes a mess of their unit they can have mine for a rediculously cheap price covering postage!!

Here to help

Owen

Pandamedic · May 3rd, 2007, 01:20

so how do you actually remove the abs acu then?

Owen850 · May 3rd, 2007, 10:12

Really simple mate,
3 small torque scews fastening the unit to the brace, 2 on the bulkhead side and one opposite side.
Snap the connector lever back on top of the abs unit.

Hey presto.....

Done it this morning mate!!!

Jul 7th, 2020, 11:45	#4
amazondean amazondean Last Online: Apr 25th, 2024 19:27 Join Date: Oct 2004 Location: Nettleton Market Rasen	I’m not sure about the newer cars, they may have different issues. I have managed to repair a few myself now, but it does involve a bit of patience. I have found that I need to look through a large magnifying glass while I re-solder the joints, as it’s not until you look through a glass that you See the borders you need to keep within. Also the post you mention says “just remove the lid”. This in itself can be a little tricky if you haven’t done it before, as it needs to be cut off with the help of a hacksaw. You can make a neat job if you know how to remove it but I am talking about the 850, v70/c70 models. __________________ There are only two things in life that is easy. One's lying down and the other is handing your credit card over. everything else has a degree of skill. Volvo 850 TDI, 850 TDI, 850 TDI Volvo V70 TDI, V70 TDI, Volvo V70 XC, (99) Last edited by amazondean; Jul 7th, 2020 at 11:47.

Apr 18th, 2007, 20:43	#6
johnnyturbo2002 New Member Last Online: Apr 24th, 2007 18:22 Join Date: Apr 2007 Location: Bremen	"Vitor" Rocha Yes I have and it was fast and easy..and best yet, cheap! Victor is extremely professional and I would recommend him very highly. He is also interested in other electrical problems that we volvo owners might have so if there are any extra parts with a reoccuring problem we should give him a shout andsee what he has to say. I'd say do it if you haven't done it already.

May 3rd, 2007, 01:20	#9
Pandamedic Master Member Last Online: Aug 23rd, 2023 21:41 Join Date: May 2006 Location: Midlands View Photos By: Pandamedic	so how do you actually remove the abs acu then? __________________

May 2nd, 2007, 21:28	#7
britten_mark Member Last Online: May 7th, 2024 15:51 Join Date: Dec 2002 Location: Durham	I'm tempted to try this after being lifted for 90 quid by an auto electrician to tell me all the wheel sensors were OK. The only thing that worries me is cutting the case; some pics would be wonderful. Also if I do this and do not cure the light does that mean I can't then take advantage of the £100 reconn'ed units as they presumably want an undamaged exchange???

May 2nd, 2007, 21:49	#8
Owen850 Volvo 850 Last Online: Jan 18th, 2009 21:45 Join Date: Dec 2006 Location: Pontypool	People, I have an ABS unit from my 850 breaker left in the garage so if anyone makes a mess of their unit they can have mine for a rediculously cheap price covering postage!! Here to help Owen

May 3rd, 2007, 10:12	#10
Owen850 Volvo 850 Last Online: Jan 18th, 2009 21:45 Join Date: Dec 2006 Location: Pontypool	Really simple mate, 3 small torque scews fastening the unit to the brace, 2 on the bulkhead side and one opposite side. Snap the connector lever back on top of the abs unit. Hey presto..... Done it this morning mate!!!

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