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Discussion Starter · #1 · (Edited)
My 2004 Man V70 AWD has got the above DTC from VIDA. There are no others. I looked in the DEM and there are two removeable bits, a pressure sensor and a Control valve/axial solenoid.
I don't think the solenoid is a spare item, I understand you have to buy the full DEM unit. Will a reclaimed solenoid from another v70 work? Can the Solenoid be repaired?
Other have suggested the issue is more likely to be the pressure sensor. comments/opinions please??

I have looked for a fuse which islolates the AOC/haldex, to stop the AWD but have not been able to find one. My rear compartment fuse board only holds 18 fuses.

Am I on the right track thinking the solenoid rather than the pressure sensor is a fault.

Cheers

Bob
 

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Not true
The pressure sensor is a separate part and costs about $125 (US) and takes less than an hour to install but you need a special Volvo tool.
If the DEM itself needs rebuilding you would also install a new pressure sensor so go ahead and buy and install the sensor first.
80% of the time that is you need!
The DEM is a single unit but can be rebuilt.
XeMODex in Canada does them for about $300 or so
Good luck
PS if they want to rip you off I can buy a pressure sensor for you for $115 or so and send it to you.
It's in the right forum now
 

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Discussion Starter · #3 ·
Not true
The pressure sensor is a separate part and costs about $125 (US) and takes less than an hour to install but you need a special Volvo tool.
If the DEM itself needs rebuilding you would also install a new pressure sensor so go ahead and buy and install the sensor first.
80% of the time that is you need!
The DEM is a single unit but can be rebuilt.
XeMODex in Canada does them for about $300 or so
Good luck
PS if they want to rip you off I can buy a pressure sensor for you for $115 or so and send it to you.
It's in the right forum now
Thanks for info. I assume your "not true" is me thinking solenoid rather than sensor. I'll therefore try the pressure sensor, then look at getting the DEM checked out/rebuilt if a new pressure sensor don't work. I have found a couple of places in the UK that appear to specialise in rebuilding Volvo DEM, and another Haldex 2 controllers for VAG.
I hope they can also check out the solenoid too as that is what DICE/VIDA say is wrong.

Can't see where the special tool is required, and I see no reference in VIDA to it. I'll find out when I come to reassemble, as currently the DEM is off the AOC and the pressure sensor has been removed, but the solenoid remains in the AOC.

Do you know of a fuse that disables the AWD?? can't figure that one. Some people tell me there is one.

Also apologies. My car is a V70 AWD R...300bhp not a standard AWD...My mistake sorry.

Thanks for the offer to buy a sensor much appreciated can I let you know?

Cheers

Bob





Cheers

Bob
 

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Discussion Starter · #4 ·
Quick update:-

Still battling to try and resolve this issue.
Question:- If applying the hand brake(park brake) does not disengage the AWD function - I have a rear wheel that wants to turn even when the brake is applied, ( all 4 wheels off ground) am I still looking at a pressure/solenoid in the DEM issue?? ( I have just read about the handbrake /AWD function.)
The DEM unit itself has been checked out by BBA Reman who say CAN & comms all work as it should.

Cheers

Bob
 

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Kind of strange how what works. Mine sometimes disengages the haldex and sometimes it doesn't. When communicating with VIDA I checked the parameters in the DEM and it is noticing that the handbrake is pulled so I don't know what to think, but I haven't thought much about it. My AWD is working and I don't plan on having the handbrake up while in gear, unless I wanted to do a burn out :rolleyes:
 

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Discussion Starter · #6 ·
Kind of strange how what works. .... When communicating with VIDA I checked the parameters in the DEM and it is noticing that the handbrake is pulled so I don't know what to think, but I haven't thought much about it.:
My VIDA notices the handbrake is pulled too (after about 2/3 clicks) So perhaps not 100% of haldex disengage 100% of the time when the handbrake is pulled??

Just trying to find straws that someone might recognise and say 99% sure that's the problem you have..

Cheers

Bob.
 

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Wheels off the ground with the handbrake on enough to trigger the handbrake light there might be enough residual pressure for the wheels to turn and since there is no load on the driveline they keep turning. Pull the DEM fuse and see if the same thing happens. Any braking should disable haldex... it was that way before haldex too with the freewheel unit the visco cars had. You could also try replacing the pressure sensor... What is the pressure reading in VIDA?
 

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Discussion Starter · #8 ·
Update:-
The DEM005 code has now been cleared, for how long is unclear. The Haldex was flushed with new oil 4 times and air blown into the oil each time to disturb as much crud as possible. All fluid was removed and a new amount poured in.
Current VIDA data shows Oil pressure 0MPa in driving, Solenoid current 12mA and pump current 4mA or 9mA (it constantly jumps)
Despite the zero oil pressure there are no DTC's or warning lights on the dash.

Cheers

Bob.
 

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Discussion Starter · #9 ·
Have re checked the DTC with VIDA and DEM-0005 is back. Cleared code, and was back before I could switch the engine off. There are no visible signs that AWD is not working (ie no DIM messages) but I don't believe it is. The pump works, and the pressure sensor appears to work - On engine start up VIDA reports that pump current reaches approx. 1500mA after about 5 seconds, runs at this level until the pressure reads 0.3Mpa then switches off. ( another 10 seconds ) pressure then falls back to Nil, ( approx. 20 seconds) but the pump does not restart when pressure is 50% as vida says it should. Driving straight away does not increase pressure,-as Vida says it should.( propshaft generated) When removed the solenoid can be activated by touching the teminals to a small 9V radio battery. The motor causing the unit to jump when activated, a clicking can be heard - the solenoid pin moving - not sure how much movement there should be but it appears to be small.
So, now I'm baffled. DEM unit was checked out by BBA reman - said to sound, Pressure valve appears to work, as does the pump and solenoid. Not much else to check/consider unless one/more is a partial failure....

comments please.

Bob
 
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