All,

So a little background first.

I bought a 2007 XC70 this past February with a blown head. That was fixed and the car runs great. However, it was discovered at that time that the AWD was non-functional in two areas; the angle gear and the DEM.

An angle gear was purchased from the local PNP and rebuilt and is now installed in the car. The original one may be ok, however the collar sleeve was stripped and replaced and the rebuilt angle gear installed. The original one will be rebuilt next summer when things warm up.

The DEM was diagnosed to be bad after I ran through XeMODeX fault tracing, which is located on their web site. All the fluids have been changed and the pump has been deemed to operate properly.

With all this in mind, here is my question.

Currently I do not have the driveshaft installed, though I would like to put it in place this weekend and then all I will have to do is have the DEM repaired.

Will a non-functioning DEM cause any damage to my Haldex unit if the driveshaft is installed and now spinning, though the pump is not running on the Haldex unit? I know the rear tires will not provide any traction, but is there any chance I can damage the Haldex by having a non-functioning DEM in place?

Inquiring minds want to know.

Thanks in advance,

Matt

I don't think you will have a problem with the Haldex if the DEM is inoperable. Wouldn't it be less time consuming to have the DEM repaired and then instal both at the same time? As you said, the rear wheels will just free wheel anyway.
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Keeping it running is better than buying new

KlausC,

In a nutshell, yes it would be quicker, but I'm just that cheap, and I have the ability to take the DEM and diagnose what is wrong with it and fix it for far cheaper than what it will cost me to send it to XeModeX.

From the testing I've done the past two days, what has happened to the DEM is that it will supply voltage to the pump, but not enough ass, i.e. current to run it, thus it does nothing.

This should be a simple fix, but if I can't diagnosis it within a day, then off to Xemodex it will go because I just the car done.

Just this afternoon I finally stopped dicking around with the exhaust hub of the CVVT and just finally replaced it. Before doing so I checked the play on the original one and it was just awful, both radially and axially. The new one, nothing, same as the intake. Glad to finally put that PITA to bed.

Matt
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1989 - 245, 1990 - 245, 1991 - 245, and 1993 - 245