Easy to do on a 4-post ramp, the bolts really should be no more than finger tight before the weight is put on the wheels, then horsed up to -'F-tight' (or 165Nm + 90deg. if you prefer) - as it's an angular tightening, I'd put a new nut & bolt in there.

Ffrr-lover wrote:

I’m using the IIDTool which doesn’t expose the CVD values.

So armed with the information that the height sensors have a second output to the CVD I have adjusted the height of the car up by 5mm via the GAP tool, this now uses a different part of the sensor as its 'zero' point.

my theory is that the original 'zero'point has become corrupted on one or two of the sensors in the CVD part of the sensor.

Now that I have moved the 'zero' point the sensors should give a clean reading.

Initial impressions are that the suspension is more forgiving now, I'm going to run the static test again and see if it makes any difference to the original graph I produced and run the car for a few more days to see if there is a difference or I'm just imagining it. 2012 TDV8 Autobiography Baltic Blue
Previous
2007 BMW M5 E60

Why not graph the damper height settings as they're the ones used by the damper module? Check your accelerometer static values too and again driving slowly in a straight line over a slightly bumpy surface looking for excessive voltage changes from 1 or 2 sensors.
The height sensors don't have a physical contact area so can't create a worn patch.

Some fantastic work going on in here, looks like you guys are headed towards what may potentially be the issue with our vehicles.

Having read through your posts I decided to check out my height sensors at the weekend.

Found the rear ones covered in mud around the point the attach to the lower control arm.

All this mud had trapped moisture in causing corrosion of the 'stud' which mounts on to the lower control arm.

The corrosion had bonded the rubber loop at the end of the height sensor rod to the stud which would have restricted its movement somewhat but I wasn't convinced this would have contributed to the issue.

Got it all cleaned up anyway and checked the front to find the o/s height sensor on mine is perhaps a little stiffer to move than the n/s.

Before moving on to replacement I'd like to do the static raise lower test and graph it to upload but I only have SDD and I'm not sure how to setup the data logger to do this... any ideas?

GraemeS wrote:

Why not graph the damper height settings as they're the ones used by the damper module? Check your accelerometer static values too and again driving slowly in a straight line over a slightly bumpy surface looking for excessive voltage changes from 1 or 2 sensors.
The height sensors don't have a physical contact area so can't create a worn patch.

I will have a go at recording the values, the height sensors don't have a physical contact patch but they can still fail, below are two videos on Youtube that show height sensor faults at certain points of the measured range.
As far as I know the only way to test the CVD output of the sensor is to measure it with the Pico measurement system. I dont have that so its a bit of trial and error at the mo.



 2012 TDV8 Autobiography Baltic Blue
Previous
2007 BMW M5 E60

Your IIDtool can show the damper height sensor values just like the height sensor values. Adaptive dynamics is very close to the top of the list of ecus in the live values selection list.

MarianaWestminster wrote:

Got it all cleaned up anyway and checked the front to find the o/s height sensor on mine is perhaps a little stiffer to move than the n/s.

Ffrr-lover wrote:

My simplistic thinking is that while there are two outputs (height and CVD) they pull that from the same component that could be faulty.

GraemeS wrote:

Your IIDtool can show the damper height sensor values just like the height sensor values. Adaptive dynamics is very close to the top of the list of ecus in the live values selection list.

Hi GraemeS I cant see them on my GAP tool, I have the Quick list and complete list and I can only see the height values and not the active damper values from the sensor.

From my last test today the graph showed my rear right sensor at the lower setting (near the original normal height setting) is not staying flat, I have also noticed that the Lateral sensor is not staying flat as well.

The car was parked on a level flat surface and I tried with the engine running and engine off.

I have ordered a full set of Height sensors and Im wondering if swapping the accelerometers around could show if the lateral sensor is faulty (i.e. the fault transfers to the location I swap it with)

 2012 TDV8 Autobiography Baltic Blue
Previous
2007 BMW M5 E60

Moving the accelerometer to a different location will either confirm or deny a problem, the tolerance is 0.05VDC so if its within that, there is no point in moving it. When you say the height sensor voltage is varying, by how much? Presumably with the vehicle not moving with your comment of ign. On or off does the output to the EAS also vary?
ETA I see you have put the graphs on your post now, I can't read the scale but the activity on the rear accelerometer coincides with suspension movement and appears to be a small variation, similarly, the yellow trace is a bit 'wavy' but looks within tolerance, I wouldn't expect small variations which would be replicated on a normal road surface to give any issues, now if there is a magnitude of error greater that any other wheel moving on a normal road surface in a straight line at a constant speed, then it could be a sensor or a failing damper. Personally I'd do an A-B comparison with the EAS output from the same sensor.

The lateral sensor is bouncing between 0.016ms2 and 0.020ms2 not sure what that is in Volts.

The right rear height sensor V is constantly moving between 1.95v and 2.0v when it should be level like the others (in access mode) it only does it in this V range, when it goes up to say 2.85v (Off road mode) it stays perfectly flat.

The vehicle is stationary without the brake on and in neutral (this stops the brakes putting any strain on the suspension as it moves up and down)

I try the different height settings to see how the outputs change and when I noticed the Lateral sensor bouncing I wondered if it was sensing the engine running so switched off the engine to see if it made any difference (it didnt)

So all the above is reading from the height level side of the sensor as I cant get a reading from the ADM side of the sensor, what I am trying to crudely work out is that if the height side of the sensor if giving erratic readings then it is possible that the ADM side of the sensor is also giving erratic readings.

When the new sensors arrive I will fit them all and run the test again, fingers crossed I get four smooth traces on the graph at all heights, I can also then assume the ADM side of the sensor is reporting correctly as well.

Hope that makes sense, like I've said its trial and error at the moment. 2012 TDV8 Autobiography Baltic Blue
Previous
2007 BMW M5 E60

Changing heights changes the track width so the tyres will be stretched inwards / outwards causing the height to not immediately at the required height, taking time to settle to the required height.

Does your list of live values ecus look like this, including active damping?
https://www.fullfatrr.com/gallery/albums/u...values.png

colalowe wrote:

The lateral sensor is bouncing between 0.016ms2 and 0.020ms2 not sure what that is in Volts.

The right rear height sensor V is constantly moving between 1.95v and 2.0v when it should be level like the others (in access mode) it only does it in this V range, when it goes up to say 2.85v (Off road mode) it stays perfectly flat.

The vehicle is stationary without the brake on and in neutral (this stops the brakes putting any strain on the suspension as it moves up and down)

I try the different height settings to see how the outputs change and when I noticed the Lateral sensor bouncing I wondered if it was sensing the engine running so switched off the engine to see if it made any difference (it didnt)

So all the above is reading from the height level side of the sensor as I cant get a reading from the ADM side of the sensor, what I am trying to crudely work out is that if the height side of the sensor if giving erratic readings then it is possible that the ADM side of the sensor is also giving erratic readings.

When the new sensors arrive I will fit them all and run the test again, fingers crossed I get four smooth traces on the graph at all heights, I can also then assume the ADM side of the sensor is reporting correctly as well.

Hope that makes sense, like I've said its trial and error at the moment.

The IIDtool is easy to use and it doesn't compromise the waterproof connector seals which occurs when poking a probe into the connector.

If seeing accelerometer live values on the IIDtool then you must be in the adaptive damping section and therefore the height sensors are the adaptive damping height sensors rather than the suspension height sensors. The 20A suspension system fuse can be removed then the sensor link arms disconnected and moved manually with the ignition switched on to check the smoothness of the output voltage without risk of the suspension changing height.