V50 CEM problem? What to do next?

[Siward]

Thanks.
How could I check whether the rear wheels are being driven?

Seems like I need to find these twisted wires as mentioned above- has anyone any guidance on where to look!

[Simmy]

check the haldex controler for water ingress

[LizardOfBodom]

Originally Posted by Siward

Thanks.
How could I check whether the rear wheels are being driven?

easiest way - turn off DSTC and floor it from standstill on wet(ish). If AWD is working, you will catapult nicely, if it isnt, you will feel it with torque steer and insane front wheel spin.

Also more scientific test :

1) lift the car up all 4 wheels
2) start it up, put in 1st gear, leave it running with wheel spinning freely

-all 4 wheels should spin (that however doesnt mean haldex is working correctly)

3) stop one of the rear wheels with hand (there will be no resistance as it has open dif)
- rear wheel on other side will continue to spin

4) now the important bit - if haldex controller is NON operational , you will be able to stop that other rear wheel withg your hand easily (no resistance)
If haldex IS OPERATIONAL, you WONT be able to stop that other wheel from rolling using your hands.

obv be careful when doing so and dont put your hands in alloy spikes, just do it with gloves and touich the outside of tyre.

[Turbodave]

Given the symptoms came back as soon as it was started, is it possible that you've disturbed something loom / CEM related but not in a good way? Possible bent a pin/s etc or a multi-plug not pushed home. Have you tried the slightly basic "unplug it, plug it in again" just in case somethings not sat correctly.

As an aside, I started said linked to thread and appear to have been very fortunate as following months of sporadic and unpredictable issues, my somewhat frowned up "fix" has held up fine (touch wood) and I'm another year down the line with temperatures from -12degs to 28degs and lots of not being careful around the CEM area and touch wood, no recurring issues.

[Siward]

Hi Turbodave.

I don't think I've bent anything but I'm certainly going to attempt a repeat of the whole procedure.

Can you help as to where these darned twisted wires ARE? I can't see them (well, I can see one that fits the bill)- do I have to remove the cable ties from around the bundles of wires and have a root around inside?

[Crazy L]

Hi Siward

A chap called Clan posted this on one of my threads as I didn't know either. Here is a copy and paste of what he wrote:

"ok twisted pairs in plugs:

front 2 *..... small plug G green underside left pins 14 and 15
Floor 2.....small plug F brown centre underside Pins 14 15 16
Cockpit 2 small Blue B top left side pins 8 9 15 16


* = This is moulded in the plastic case near the relevant plug


I listed them all , to be safe ...

terminal repair wire 30656678"

I hope that helps

[Siward]

Well I repeated the whole contact cleaning procedure and for a moment I thought I'd fixed it since the problem disappeared.

However on starting up again today the brake failure messaged reappeared after driving perhaps 100 yards so its back to the drawing board.

Still couldn't see these twisted wires though- thankls CrazyL above I will have a look.

[Siward]

I am going to have to give up the old girl- I need something reliable for work!

See the for sale section...