Unplugging the connector at the top of a front strut will disable the system causing all bypass valves to stay closed.

Yes, as above, once you disconnect the connector you will get “Adaptive Dynamics Fault” on the dash, then you will really know what hard is 🤣 hang on to your fillings…. Think mine isn’t that hard, but not far off.

I’m not sure if you only get a fault showing if it goes open circuit, ie fully broken wire… and that you could still have an issue but without a fault showing.

See what our meet up tomorrow unearths….

 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

For me it’s the “it’s not as hard” (stop sniggering at the back) part. If it was as hard as when disconnected them something is broken. Some days are worse than others for me with no real indication of what changed.

Not as hard… the solenoid is not opening all the way. I.e. not enough voltage or amps (well, however the PWM signal works) and it only partially opens. Hence my query on those connectors… but the same could be with the ECU sending the signals.
Or worn shocks… but others have replaced them with no change in ride quality.

is the age of the wiring a concern? Does the signal struggle where the cable is brittle somewhere and therefore more resistance? Not quite snapped, so no fault showing…

Bring on tonight and hopefully some useful insight into what is causing this for us. Currently driving: 2012 L322 SE Overfinch 4.4 tdv8

Past rides:
2014 Audi Q7 3.0d (good riddance)
2010 L322 Autobiography 5.0 Supercharged
2011 L320 HSE 3.0 sdv6
2014 Jaguar XF-RS 5.0 supercharged
2007 BMW 535D
2005 Mini Cooper S

https://www.fullfatrr.com/forum/topic59478.html

Indeed… that about sums up my thinking too. Mine is constant, doesn’t seem to do any adjustment, but something must be getting through or it would be solid.

 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

Ffrr-lover wrote:

Not as hard… the solenoid is not opening all the way. I.e. not enough voltage or amps (well, however the PWM signal works) and it only partially opens.

Ah, ok, so for the valve to be half open, it wouldn’t get supplied with 6volt, as my simple mind may have initially thought, but 12v half the time… or close to….

I’m not sure what would happen with iffy wiring with that then… would the 12v time be artificially interrupted…. Though I’m guessing these PWM signals might be cleverer than that. I was hoping to maybe supply 12v across the pins of the shock and feel a difference in the car if you pushed that corner down.

 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

 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've been doing a bit of reading-up on this...
Apart from the quality of the PWM signal and the current measurement, there are essentially two types of inputs to the control module
Height measurement - a second variable resistor in the traditional height sensor - it doesn't share measurements across CAN, needs to be checked for validity on each corner.
Accelerometers - capacitive type, so subject to ageing, output is 1V/g (+/- 0.05V/g) - again, needs to be checked for validity.
Without (hopefully) introducing any confirmation bias, I think the accelerometers are the most likely cause if the PWM signal quality & current is OK.

Once I've done waveform A-B checks, volt drop & current draw checks, I think accelerometer input & output voltages will be the focus, If there were issues with height sensors, this would most likely only affect one corner.
Now, does anyone have a wiring diagram? my Topix access has finally been set to 'inactive'

I can’t see an adaptive dynamics wiring diagram in the diagrams in the workshop manual. I got it from the Wiki. May be that not all of it is there.

I can see this, so might be 3 accelerometers…. 3 wires for each I read.

Click image to enlarge

I suspect that the last 3 possible positions were for another vehicle which should have been replaced by the 1st 3 when that part of the documentation was copied from elsewhere.

D2s fitted with ACE had 2 accelerometers, one under the floor of the RH front seat and the other in the roof above. The one under the floor could be damaged or even just be loose in its mount which upset ACE's operation.

mjdronfield wrote:

I can’t see an adaptive dynamics wiring diagram in the diagrams in the workshop manual. I got it from the Wiki. May be that not all of it is there.

I can see this, so might be 3 accelerometers…. 3 wires for each I read.

...

https://www.fullfatrr.com/gallery/albums/userpics/15719/CVD~0.pdf

Excellent - thank you!

So, had a cracking few hours with Haylands and Phoenix. We came to the conclusion that the shocks were ok, but the first thing we saw was that the front right accelerometer was giving a changing reading when the car was stationary, which obviously isn’t right. Then we went for a drive and saw that the front left height sensor was reading low and a bit intermittent/behind the 3 others. So the ECU would be thinking the corner was leaning all the time, and try to compensate.

Master plan is to replace the height sensor and see if I can swap the accelerometer with another, to see if it’s a connector/wiring issue or the sensor itself.

Went out in Petes car, showing decent live readings, and it’s definitely more compliant.

Thank you both for your time and effort. Hopefully a bit more info for everyone. I know the height sensors have 6 wires on, 3 for adaptive dynamics and 3 for air suspension, so it’s not unrealistic for the air suspension readings to be fine, but not the dynamics side……

There were some pics…. But I wasn’t the camera man…

 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