ABS control unit repair - Page 21

Clan · Dec 2nd, 2010, 18:37

Quote:

Originally Posted by dd1898

Gasc2188 - when you removed your DEM could you still use your car? I sent my BCM to BBA the other day but have found out today that they are closed due to the weather. I have lost the AWD on my car and was wondering if like you the actual fault is with the DEM.
I have had the car up on stands and can turn the prop shaft and see the two fronts turning b ut no rears. The dash display shows DEM DTCS SET when I use the the read and fog light check.

you need to get the codes in the DEM read , but it is most likely the oil pressure sensor in there . It wont work if this reading is faulty .

dd1898 · Dec 2nd, 2010, 20:23

Thanks Clan, it is going into my local indy, Volmech, on Monday. Just trying to think ahead. Am hoping it is going to be a simple, not too expensive repair. Suspect not.

gasc2188 · Dec 3rd, 2010, 00:57

Hi dd1898,
Sorry not been on here for a while, but moved house and problems with the electrics and broadband etc. Hope your getting somewhere with your diagnosis. I didn't use my car with the DEM off the car. There is a pressure sensor which is literally sandwiched between the DEM and the rear diff, so if the DEM is off the car, the pressure sensor cant be held in and you will lose fluid from the Haldex part of the rear diff. Like CLAN said, I've heard of these pressure sensors going wrong, but also heard of the DEM's going wrong and BCM's going wrong. But the point I'm making is that without being able to pinpoint fault codes, you risk losing money by buying bits that maybe are fine. To the best of my knowledge, the only way you can properly diagnose your car is to allow Volvo to plug your car into their diagnostic computer, other fault reading machines just arn't specific enough. It cost me £28 but i've got to say it was money well spent. Sounds like the local Indy may be able to put his finger on the problem, and he may have the proper diagnostic computer system to diagnose the probllem. Lets hope its a cheap fix. Let me know how you get on mate. My XC90 has been great this week in all this snow, and even though I've been crawling about, still managed 30 MPG's :-)

dd1898 · Dec 8th, 2010, 22:32

After a week with Royal Mail my BCM arrived at BBA Reman yesterday, they have checked it over and cannot find a fault with it. Due back tomorrow then car back in with indy next Monday to see what additional faults are on there. Will see what happens when I connect it back into my car, as the 'Brake Failure' was intermittent then might get the AWD back.

Don't think so though.

gasc2188 · Dec 9th, 2010, 17:49

I must say it ruined my day when they checked my BCM and it was fine, I was pinning my hopes on it being that. But at least you know the BCM is fine, so its something to tick off. Did BBA charge you for testing it? I got away with it because they said they were only 99% sure it was fine :-/ Good luck anyway and let us know how it goes.

dd1898 · Dec 9th, 2010, 21:10

Quote:

Originally Posted by gasc2188

I must say it ruined my day when they checked my BCM and it was fine, I was pinning my hopes on it being that. But at least you know the BCM is fine, so its something to tick off. Did BBA charge you for testing it? I got away with it because they said they were only 99% sure it was fine :-/ Good luck anyway and let us know how it goes.

I got the same response from BBA, again no charge as they could not be sure that it was 100% correct.
Going into the indy on Monday assuming I get it back in time to check for further codes.

dd1898 · Dec 13th, 2010, 17:18

Had my car back in to local indy today (Volmech). My BCM had been inspected by BBA and they could not find a problem with it. Got it back over the weekend and still 'Bake Failure' message and no AWD.
Volmech looked at it today and in the end found that one of the relays at the rear of the dashboard was throwing everything out. * SAS control module signal missing *
They replaced it FOC as the car was with them a couple of weeks ago and they did not recognise the original fault.
Pleased with Volmech for their honesty and also pleased because I have my AWD back in readiness for the poor weather later this week.

Thanks for your help with this issue.

Volmech also mentioned that they have replaced 3 AWD sleeves on XC90's over the past 2 weeks.

Darth Vol · Dec 27th, 2010, 13:42

lads.

what type of tool is required to remove the abs unit from the car?

tried fitting all the small hex/normal tools but nothing is fitting.

can anyone advise?

cheers

bren

Chris_Rogers · Dec 27th, 2010, 15:27

E5 socket.

justinhill · Jan 8th, 2011, 16:59

Just to say: today I finally got round to repairing the ABS ECU on the wife's 850, following the advice on this forum. (It should have been done last month but the holidays got in the way.)

I cracked open the ECU case, removed the rubbery lacquer, de-soldered, re-soldered, re-lacquered, slapped it together again and sealed it with mastic.

ABS and Tracs lights now go out and everything works as it should. Thanks VOC forum - without you I couldn't have fixed it.

Justin

Dec 13th, 2010, 17:18	#207
dd1898 Member Last Online: Feb 17th, 2024 10:52 Join Date: Jul 2010 Location: Stockton on Tees	BCM Fault sorted :) Had my car back in to local indy today (Volmech). My BCM had been inspected by BBA and they could not find a problem with it. Got it back over the weekend and still 'Bake Failure' message and no AWD. Volmech looked at it today and in the end found that one of the relays at the rear of the dashboard was throwing everything out. * SAS control module signal missing * They replaced it FOC as the car was with them a couple of weeks ago and they did not recognise the original fault. Pleased with Volmech for their honesty and also pleased because I have my AWD back in readiness for the poor weather later this week. Thanks for your help with this issue. Volmech also mentioned that they have replaced 3 AWD sleeves on XC90's over the past 2 weeks.

Dec 2nd, 2010, 20:23	#202
dd1898 Member Last Online: Feb 17th, 2024 10:52 Join Date: Jul 2010 Location: Stockton on Tees	Thanks Clan, it is going into my local indy, Volmech, on Monday. Just trying to think ahead. Am hoping it is going to be a simple, not too expensive repair. Suspect not.

Dec 3rd, 2010, 00:57	#203
gasc2188 Junior Member Last Online: Nov 19th, 2022 20:52 Join Date: Apr 2010 Location: Mansfield	Hi dd1898, Sorry not been on here for a while, but moved house and problems with the electrics and broadband etc. Hope your getting somewhere with your diagnosis. I didn't use my car with the DEM off the car. There is a pressure sensor which is literally sandwiched between the DEM and the rear diff, so if the DEM is off the car, the pressure sensor cant be held in and you will lose fluid from the Haldex part of the rear diff. Like CLAN said, I've heard of these pressure sensors going wrong, but also heard of the DEM's going wrong and BCM's going wrong. But the point I'm making is that without being able to pinpoint fault codes, you risk losing money by buying bits that maybe are fine. To the best of my knowledge, the only way you can properly diagnose your car is to allow Volvo to plug your car into their diagnostic computer, other fault reading machines just arn't specific enough. It cost me £28 but i've got to say it was money well spent. Sounds like the local Indy may be able to put his finger on the problem, and he may have the proper diagnostic computer system to diagnose the probllem. Lets hope its a cheap fix. Let me know how you get on mate. My XC90 has been great this week in all this snow, and even though I've been crawling about, still managed 30 MPG's :-)

Dec 8th, 2010, 22:32	#204
dd1898 Member Last Online: Feb 17th, 2024 10:52 Join Date: Jul 2010 Location: Stockton on Tees	After a week with Royal Mail my BCM arrived at BBA Reman yesterday, they have checked it over and cannot find a fault with it. Due back tomorrow then car back in with indy next Monday to see what additional faults are on there. Will see what happens when I connect it back into my car, as the 'Brake Failure' was intermittent then might get the AWD back. Don't think so though.

Dec 9th, 2010, 17:49	#205
gasc2188 Junior Member Last Online: Nov 19th, 2022 20:52 Join Date: Apr 2010 Location: Mansfield	I must say it ruined my day when they checked my BCM and it was fine, I was pinning my hopes on it being that. But at least you know the BCM is fine, so its something to tick off. Did BBA charge you for testing it? I got away with it because they said they were only 99% sure it was fine :-/ Good luck anyway and let us know how it goes.

Dec 27th, 2010, 13:42	#208
Darth Vol Exploring Europe Last Online: May 27th, 2024 20:48 Join Date: Feb 2010 Location: Munich View Photos By: Darth Vol	lads. what type of tool is required to remove the abs unit from the car? tried fitting all the small hex/normal tools but nothing is fitting. can anyone advise? cheers bren

Dec 27th, 2010, 15:27	#209
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	E5 socket.

Jan 8th, 2011, 16:59	#210
justinhill New Member Last Online: Nov 22nd, 2011 17:36 Join Date: Nov 2010 Location: Horley	Just to say: today I finally got round to repairing the ABS ECU on the wife's 850, following the advice on this forum. (It should have been done last month but the holidays got in the way.) I cracked open the ECU case, removed the rubbery lacquer, de-soldered, re-soldered, re-lacquered, slapped it together again and sealed it with mastic. ABS and Tracs lights now go out and everything works as it should. Thanks VOC forum - without you I couldn't have fixed it. Justin

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)