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S80 AWD issue mechanical faillure

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Old Mar 21st, 2019, 22:00   #1
Scalix
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Default S80 AWD issue mechanical faillure

Good evening All,

I have a VIDA message saying mechanical faillure of the oil pump. No pressure actuator sliping (something like that)

2000 miles ago the AWD of the car was working fine on gravel. No idea if the message was already there.

I changed the filter and the oil but still the same DTC message and no AWD.

When the car in P position I can't move the prop shaft or rear wheel shaft.

What can be the problem ? faulty pump ? faulty sensor ?

Thanks for the help.
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Old Mar 22nd, 2019, 00:09   #2
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What is the actual DTC code?
You can check whether or not the haldex oil pump is working by removing electrical connector and connecting a 9v radio battery across the terminals.
You should be able to hear the pump.

You can also get live data via VIDA/DICE of some haldex/dem conponents.

As you cant rotate propshaft it would suggest issue is in the Haldex unit/components or the DEM.

Cheers

Bob
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Old Mar 30th, 2019, 13:25   #3
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Thanks for the reply. I was abroad. I will have a look tomorrow.

By 9v battery you mean something like this ?

DV019_Jpg_Regular_424922_single_above_R.jpg

Thanks
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Old Mar 30th, 2019, 23:20   #4
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Quote:
Originally Posted by Scalix View Post

By 9v battery you mean something like this ?

yes. Thats what I used.

Cheers
Bob
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Old Mar 31st, 2019, 23:35   #5
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What’s your mileage. My xc70 had a knackered pump at 200k
Haldex filter had never need changed since 06.
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Old Apr 2nd, 2019, 13:25   #6
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I have 71000 miles. I noticed the AWD stop working arround 70000 miles so I decided to change oil and filter. The oil was black but not too bad. Changing oil and filter didn't solve the problem.

I will try to have a go with the 9V battery
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Old Apr 3rd, 2019, 12:17   #7
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It's likely the pump in the AOC coupling, probably the most common failure of them. You should have an error on the dash.

Testing the pump with a 9v battery will tell you if there have been an electrical failure but not mechanical.

Get the oil and filter changed at the same time as the pump.
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Old Apr 7th, 2019, 17:58   #8
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Thanks for the help all.

So i had a look and...

The error code is DEM-P188974

The pump works with the 9v battery and i can reach a pressure of 0.18MPa on VIDA.

I can also activate the pump with VIDA. I can ear it however the pressure goes up to 0,15mpa. The pump start for 2 seconds and stop. This is normal ?

Last edited by Scalix; Apr 7th, 2019 at 18:09.
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Old Apr 25th, 2019, 22:51   #9
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Any idea ? Or lead so i can have a look at ?

Thanks
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Old Apr 28th, 2019, 10:44   #10
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look here -


https://forums.swedespeed.com/showth...ue-DEM-P188974

issue appears to be pressure switch inside the DEM

Good luck

Cheers
Bob

Last edited by 100K+; Apr 28th, 2019 at 10:48.
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