Uneven suspension eas fault

wammers said:

Yes that is correct. It should be closer than that, but if it sits level and all the readings are in range that is what you have.

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Fair enough but If i "write" the 20 points "out" on the other settings it still sits exactly the same!!!
And yes it is accepting the write as I go back in and check it by reading it again
I'm gonna have another play and type in figures again
I'll report back in a bit

newt888 said:

I'm not trying to calibrate on the bump stops I was referring to the height sensor readings being uneven when the bags are deflated So when the car is on level ground I get
NSF 45
Osf 65
Nsr 65
Osr 65
All within 1 or 2 points
So the NSF is reading 20 points lower!!!
This is the same with 3 sensors!!

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When the bags are deflated you ARE on bump stops. You CANNOT input 45 it won't accept it, minimum setting at access is 50. And that is 20mm above bump stops. Just set NSF to read 65 on stops and see what you get. Then adjust as needed. Is the sensor arm bent?

newt888 said:

Fair enough but If i "write" the 20 points "out" on the other settings it still sits exactly the same!!!
And yes it is accepting the write as I go back in and check it by reading it again
I'm gonna have another play and type in figures again
I'll report back in a bit

Click to expand...

Think we are at cross purposes here. Select access on dash, measure from centre of wheel to wheel arch 405 mm adjust corners until all are at this measurement, plus or minus 7mm. DO NOT be sat i vehicle when you set the heights. Read the settings to give you even height, then write them to ECU. Do the same for every other setting.

With the vehicle in the low setting I get when checking heights
Nsf 80
Osf 90
Nsr 85
Osr 80
But at this setting with these figures the actuall front near side height is 20 mm higher than the left!
To get the front to level up I need to make the nearside 20 points lower than the OS
When I write the 20 point difference in to the write section it gives a target height incorrect fault !

wammers said:

When the bags are deflated you ARE on bump stops. You CANNOT input 45 it won't accept it, minimum setting at access is 50. And that is 20mm above bump stops. Just set NSF to read 65 on stops and see what you get. Then adjust as needed. Is the sensor arm bent?

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Re read please , these are the figures that are given back when I "get sensor height" not what I have input my self!

This is with the car level I have adjusted the height difference out using the down function

If I now "write" this figure in to the near side front write box
It says fault as the target is wrong

With the car in " access" I have 405 mm every corner
The height sensors are all set to 65
The "live " height from the sensors are as follows

As can be seen there is a large difference on front readings
If I try to allocate the difference on the other settings to sort out the height imbalance I get the target height fault (no.6)

newt888 said:

This is with the car level I have adjusted the height difference out using the down function

If I now "write" this figure in to the near side front write box
It says fault as the target is wrong

Click to expand...

Modifying Stored Heights:​

[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]

Once you have recorded the physical and virtual measurements for each of the four corners and each of the stored height profiles, then you are ready to begin making changes.​

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Rules:​

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Front Rear
Extended 120-180 105-150
Standard 95-150 85-130
Low 75-140 75-120
Access 50-110 50-100​

[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]You will notice that the Front range of values for the EAS stored height profiles is different from the Rear range of values. This is normal. The Front EAS Sensor and Sensor arm position is different from the Rear. This accounts for the difference in the number for each of the stored height profiles. The Front numbers do not need to be made to match the rear! This will cause problems.

I cannot see what the readings are max and min settings for each height above. These instructions come with EASunlock read them. Have you checked if sensor arm is bent?
[/FONT][/FONT]

Come to the conclusion that whatever figure you input , the near side front is always 20 mm higher
Any other ideas

No bent sensor arm

All of figures are between numbers quoted

newt888 said:

With the vehicle in the low setting I get when checking heights
Nsf 80
Osf 90
Nsr 85
Osr 80
But at this setting with these figures the actuall front near side height is 20 mm higher than the left!
To get the front to level up I need to make the nearside 20 points lower than the OS
When I write the 20 point difference in to the write section it gives a target height incorrect fault !

Click to expand...

The figures DO NOT indicate mm distances, just electrical bit values....so incresing or descreasing this value by 20 WILL NOT relate to a 20mm change in height....

This is why you need to make small increases/decreases in the stored figure and then physically remeasure the vehicle heights, as a difference of 20 units might only be 5mm or 25mm....

I seem to of managed to get it reasonably level but I'm not happy with the way it's done, the figures I pulled off before this fault ever happened were reasonably even left to right, (within a few points of each other ) I don't have a picture of this

Here is a good example
With these "exact" figures the car was out 25 mm higher on NSF


With these extremely modified figures (which in my opinion should not need to be this far adjusted)
I get a reasonably even height give or take 5/1m difference on level ground
As you can see there is near on 20 points reduced from all target heights (except access) of the NSF !!


To me there is still something wrong , but by reducing the settings of the NSF by a massive number I have "masked" the true problem

I have another p38 which I did some tests on with target heights and I inputed these figures

Which are the same figures I used on the problem car and had a 25 mm difference and the 2nd car sits nice and level on every setting !! Within under 4mm left to right!

So I still want to find the fault with the NSF
Also as previously mentioned , the NSF sensor reads 20 points below the rest when the car is sitting on the bump stops!! So there is definetly something wrong with the readings of that corner. What is the next part in the link ?
My next thing is to actually measure resistance reading from the sensors and see if there is a difference left to right , when the software is saying there is. I shall drop it down by deflating bags so I know it's as low as it can go and I'll measure resistance of the sensors at the front , because at this point there is a 20 point difference logged somehow by the car

Saint.V8 said:

The figures DO NOT indicate mm distances, just electrical bit values....so incresing or descreasing this value by 20 WILL NOT relate to a 20mm change in height....

This is why you need to make small increases/decreases in the stored figure and then physically remeasure the vehicle heights, as a difference of 20 units might only be 5mm or 25mm....

Click to expand...

Thats why I have referred to them as points....
It just so happens that near enough 20 points almost eliminates my 25 mm problem lol

Small increases made a small difference, 20 units on the problem corner equated to 25 mm
I moved a non problematic corner 2 points (as a test)and it made a 10 mm difference!
This is why I firmly beleive there is more to this problem and there is something else going on to the NSF

If I dropped the osf corner 20 points it would go down about 40 mm!..

The sensors are not precision made and as such there will be reading differences.....although I admit 20 is a big difference, but aslong as it isn't 'out of range' of the system or the phsycial limits of the sensor, and the vehicle sits withn tolerance of +/- 5 to 7mm , I would not be overly concerned....

Saint.V8 said:

The sensors are not precision made and as such there will be reading differences.....although I admit 20 is a big difference, but aslong as it isn't 'out of range' of the system or the phsycial limits of the sensor, and the vehicle sits withn tolerance of +/- 5 to 7mm , I would not be overly concerned....

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Completely agree
and I appreciate every ones input
But please don't fail to forget that before this problem came about there was no 20 points difference in the figures and it sat level !!
I have tried 3 sensors on the nearside front and all 3 have need to be "set" 20 points out from the other side to sit level within 5mm!
To me all I have done is adjusted round the problem and not resolved it
I'll give it a few days of driving and see how it goes , i would like to find out the true fault
To some it may sound like a big deal but 25 mm extra height on the nearside front makes for wierd handling!

Saint.V8 said:

The sensors are not precision made and as such there will be reading differences.....although I admit 20 is a big difference, but aslong as it isn't 'out of range' of the system or the phsycial limits of the sensor, and the vehicle sits withn tolerance of +/- 5 to 7mm , I would not be overly concerned....

Click to expand...

The positioning of the sensor on it's bolts or a slightly bent sensor arm would easily give that discrepancy.

Not teaching you to suck eggs so bear with me....

I trust you cleaned the multiplugs with a good electrical contact cleaner and scrubbed with an old toothbrush as grubby contacts can give different resistances and hence readings.

Have you checked all the cabling and looms in the EAS system as an internal break in the cabling to the sensor making dodgy a connection will again result in increased resistance.

Have you checked the connections to the EAS ECU for security and any signs of corrsion as this will again again give increased resistance.

All the sensers are is a resistive wiper board so if it is a new senser, the next thing to do would be to check for increased resistance in the wiring.

I fully understand the need to find things that seem out of place as I do it too....but when it comes to a P38 Range Rover, some times the faults defy all logic and I have learnt to accept it has its own personality and like a woman, don't argue, just smile and say 'Yes Dear....'

wammers said:

The positioning of the sensor on it's bolts or a slightly bent sensor arm would easily give that discrepancy.

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That too, my friend.....

And is most likely the ultimate cause....

I have checked plugs but not wiring ,the difference is the same form bottom to top so more than likely nothing to do with wiring .
I have a plan , I'm going to pop off the little rubber link with the bags deflated via the eas unlock software , and then using the "get sensor height" section I'm gonna see how far out it is before I get a more sensible/ level reading ,
On the bump stops the other 3 sensors read with in 1or 2 points of 65 mm but the nearside front as mentioned before reads 45 give or take a point or two.
if I can the loose that diddernce on the bolts I can sort it
A job for the weekend lol