No awd!!!

[wagonwheels]

Ive been chasing my awd issues for months so far.I have a 2004 xc70 and so far I've had the Dem returned,haldex filter and oil changed,changed haldex pump,new angle gear ,new pressure sensor and refurbed Bcm .Ive got bcm-0095 no comms and Dem-0002 ,000b presure sensor fault which is shutting down the awd.
Any advice would be appreciated.

Stuart

[Rooster]

So you have drive from the front wheels to the haldex unit down the propshaft,

The connector to the haldex unit only has 4 wires to it,

12v power,
earth,
Can high (2.8v ish) and low (2.3v ish)

[wagonwheels]

Hi rooster.Ive never checked the actual output but the rear fuse is ok.Im kind of thinking its brought about by the lack of comms on the network at the Cem via the Bcm. There is a permanent fault on no comms with the Bcm .

[Rooster]

Need to start with basics then,

First lay under car and make sure propshaft doesn't spin free,

Then you need to get a multimeter to check supplies to DEM connector

[wagonwheels]

Ok,ill have a play tomorrow night weather permitting.Ive not long had a new transfer box fitted after the second sleeve replacement failed causing too much damage but ill check it anway.Its just such an over complicated weak design and not something id expect from Volvo.

[wagonwheels]

Ok I had a fault I the Rem unit that I cleared and took no note of as I thought it was unrelated but now I can clear the bcm fault and Dem faults and get awd!! It will work for 30mins or so then shut down showing Dem-000b pressure sensor.The oil that I removed when doing the work on it the other week was sludgey and grey.Could it need another flush after changing the oil and filter in the AOC? Or is it just a my Dem having a wobbly( was rebuilt by bba reman last year but I've not been impressed with work ive had done in the past) Can anyone recommend a place to look at it?

[bikemad]

Hi guys, I hope I'm not hijacking your thread.
I'm hopeful someone can shed light on my non working AWD!!.
Have been right through BCM, ( fixed that)
Have vida dice, read out codes.
Just left with DEM no communication.
Tried all Xemodex flow charts n fault finding.
I'd say it's the DEM!!
Are they coded? Or just plug n play?
Thanks in advance.

[100K+]

DEM's are coded to car. NOT plug and play.
HOWEVER contact volvodiagnostics.com, based in London they advertise on here. If its a DEM issue (or other electrical issue Lucus is a very good bet to sort it. His repair/exchange unit is far cheaper than a new Volvo unit.

What is the actual DTC code?? DEM?????

Cheers

Bob

[wagonwheels]

I can second 100+ recommendation,saved both of us a fortune after poor rebuilts but so called expert companies.Lucas can bench test your unit for a very small fee and rebuilt it for as little as £110 or an exchange for about £380.Very helpful quick turnaround.

[wagonwheels]

Its been a few months of awd goodness but now ive noticed the haldex unit is weeping fluid out of the actual unit (I.e the rubber seal holding the electronics inside) ! How is oil getting out into the unit? I'll need to send the Dem off to get it cleaned and resealed with Lucas but I don't know how the oil is getting into it! Wish is would stop giving problems as I love the old bus.Had many £££'s spent recently with bigger brakes,rollbars,intercooler,full exhaust,7 seat convertion,Volvo blinds,thermostat,new wheels and tyres (again) and lots of other bits and bobs.I'm loathed to walk away from it now.