Can I just jump in on this with as bit about PWM signals - it seems to me that if the duty cycle is high, this will cause stiffened suspension, now no amount of voltage measuring will give you the duty cycle. 'If' the duty cycle is correct, then the actuator must be slow in releasing or the viscosity / contamination of the damping fluid is too high.

I don't have adaptive damping so I'm unable to help with actual signals, at some point though, the resolution to this is going to need the PWM signal 'scoping for signal quality and plausibility and the dampers themselves tested for reaction times.

Yeah, I think either front dampers are jiggered, and can’t respond to signal/solenoid stuck, no oil in… or they are fine and the signal is wrong, due to sensor etc. That’s pretty much where the thread started. It’s finding out which, given it’s gonna cost upwards of £1000 to replace front shocks, and some have done that, with no improvement. I know earlier in the thread someone used a diagnostic tool to look at the ECU signals, but guessing we would each need to do similar to prove one way or the other… and I don’t think you can easily rig up something to send “12v” to the shock and see if it’s soft…

Gonna be the garage I suspect….. and hope they diagnose it correctly….. we can’t be the only ones who are having the issue… maybe it’s age and wear on the shocks….?

Gonna be some unhappy L405 owners soon, if that’s the case….

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

I think you're not too far from me, I'd be happy to 'scope the sensor & output signals, can't do much about the damper internals though!

it won't cure anything but would at least give you a reference point and an idea if it's an issue with the dampers or the control side.

If you do sort a meet then let me know and I'll pop over with mine that has working adaptive damping to set a baseline...  Pete
I now have permission from the boss to use Y.O.L.O. Enjoy life
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-

That'd be a good plan!

Brilliant gents…. That’s a lovely offer from you both. It’s really spoiling the car for me now. If it needs new shocks, it can have them, but I don’t want to do it if it’s not the issue.

I still have my old rears here too.

I’m in Chesterfield.

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

Mark, have a chat to Iain and let me know, I can make most times from Saturday afternoon for most of the next week...  Pete
I now have permission from the boss to use Y.O.L.O. Enjoy life
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-

This Saturday p.m. would work for me, can't leave until after 1330 though - maybe move to PM to save cluttering up the thread?

Nice one. Saturday pm works for me.

Will move to PM

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

Really interested to hear your findings chaps!

Phoenix scoping out the signals on a working and non working l322 could finally give us direction as to where the problem lies...

If I wasn't tied up this weekend I would absolutely join you all.

Good luck 👍

Phoenix wrote:

Can I just jump in on this with as bit about PWM signals - it seems to me that if the duty cycle is high, this will cause stiffened suspension,

Cheers for that, I was (obviously) guessing which way the bypass would operate as I'm a bit late to this particular party!

The default bypass valve position is closed.

front bushes - Christian took some photos of his 2011

https://www.fullfatrr.com/forum/topic61540.html

Sixth post down, the bushes are gone - big time !

rvbush wrote:

Are you sure the adaptive suspension is working and not set permanently to 'hard' as in an ECU fault?