N

newt888

New Member
I have a 2000 p38 and it's sitting in level, I had to change a rear bag a few months back as it was leaking and I've changed the compressor piston seal and liner as they were worn, I have the unlock software for eas and the system iphas no fault codes except everyso often "the vehicle has moved"
But I have a slightly annoying problem
The drivers side of the car sits on average 15 mm lower than the passenger side (front and back) on all height settings,
The rear bags are new and the front drivers side is not leaking, there is no leaks at any pipe connections either,
The car does not sagg down over night either, the next morning it will be exactly how it was left,
Couldn't be a leak in the valve block
Or could it be a height sensor reading wrong on the passenger side front ( as the front is more noticeable and generally has the largest difference left to right) and actually the problem lies with the NSF trying to raise 15mm to high?
When I had the unlock software plugged in I deflated the bags and all sensors were reading 60 of there abouts and the NSF was 44! If it's sitting on the deck how can this figure be possible ! At the point of the bags being emptied the car finally sat level!
Any ideas?
The only thing I haven't checked is if there's air coming outfox the exhaust when the compressor is running but that seems to only happen if the vehicle won't raise, mine raises fine just not the same left to right,:doh:
 
Needs re-calibrating or a new sensor. Don't think, without looking it up, that 44 is in range. Think the lowest you can go on access is 50.
 
Try using EAS unlock as you have it to set the NSF and NSR to higher settings on all modes and see where you go from there. If that resolves the issue and the car remains level, then you've sorted it at no cost. If you have further issues, then replace the NSF height sensor, and it'll need calibrating then anyway.
 
Alan C said:
Try using EAS unlock as you have it to set the NSF and NSR to higher settings on all modes and see where you go from there. If that resolves the issue and the car remains level, then you've sorted it at no cost. If you have further issues, then replace the NSF height sensor, and it'll need calibrating then anyway.
Click to expand...

I have tried "changing" the settings on the suspect corner to level it out , or fool it in to what height it is, this hasn't worked , the NSF always goes 10/15 mm height than others , new height sensor I think ;)
How do you calibrate them? I have watched the YouTube vid on how it is done but it doesn't acctually tell you anything! I can use the unlock software fairly confidently but all you seem to be able to do is set target height?
Thanks for response guys;)
 
Measure from the wheel arch rim to the wheel centre and adjust the heights in small steps to level it. Adjusting one corner affects all the others due to weight transfer so it's a bit fiddly. The heights have been posted many times do a search.
 
Datatek said:
Measure from the wheel arch rim to the wheel centre and adjust the heights in small steps to level it. Adjusting one corner affects all the others due to weight transfer so it's a bit fiddly. The heights have been posted many times do a search.
Click to expand...

I have done all this , I have set the effected corner to a different figure to "confuse " the system into sitting level still goes to a height that is 15mm taller :(
 
That sounds very much like a worn out sensor,they can give the same readings in more than one place rather than just going open circuit.If you connect a mulitmeter across it and move the, (Disconnected) arm up and down you should see a smooth transition of resistance.Jumping around ,the same readings in more than one place or open circuit - all these mean its shot.
 
newt888 said:
How do I calibrate new sensor?
Click to expand...

Are you sure you have used the EAS software to write the new values back? You calibrate the new one exactly the same way you did it before assuming you did it right and that you had "Good Idle" on the software so you know you were communicating with the EAS correctly.
 
Datatek said:
Are you sure you have used the EAS software to write the new values back? You calibrate the new one exactly the same way you did it before assuming you did it right and that you had "Good Idle" on the software so you know you were communicating with the EAS correctly.
Click to expand...

Yep done that properly , I wouldn't call it calibration but I know what it means, I would class calibration as setting a bottom and top figure and matching it to the target height you write in on the programe..
I will fit another height sensor and write the target numbers in again tonite and see what happens:)
 
The offical calibration uses spacer blocks between the axle and the bump stop brackets....

Jack up chassis, place spacer, lower on to them....

Read the Senser height value and plug it in to the calibration box for that ride height....

Lather , Rinse, Repeat for the other ride height....(I believe the offical calibration is for two ride heights - access and standard - with the EAS ECU interpolating the readings for the other ride heights)

The Wammer very kindly recently put a dimensioned sketch of the two calibration spacers on here only a few short weeks ago.

If you know a friendly machine shop with some nylon rod who can turn the required spacers to suit, it may well be worth it....
 
Fitted replacement sensor,
Used the "write " section to re write target heights
I'm still getting uneven readings
When I deflate bags I'm getting near on 65 on osf and both rear , however the nsf is reading 46 that's a difference of 20 points! That means the nsf is reading lower than sitting on the bump stops!!

When people mention recalibrate I would of thought that this is where it started, deflate all air and re write sensor values from this " control/ base" setting,
How do I recalibrate the NSF sensory to read 65 when on bump stops?? Or can it not be done?
 
Each sensor may indicate different readings for the same ride height as the height sensors are not prescion made....

i.e.

NSF Access = 65
OSF Access = 72

So aslong as the phsyical real world measurements at access between the centre of the wheel arch and the centre of the Wheel Rim = 405mm all is hunky-dunky....

Ensure the vehicle is on the flattest bit of land you can find, lower the vehicle to Access, measure the physical height - should be 405mm in access - using the EASUnlock Software adjust the low side by a couple of digits up wards and write this value to the system, raise the vehicle to standard and back to access and re-measure the physical ride height and note the change.

It will be an iterative process of going back to adjusting the values until you get pretty damn close all round.

The other way - the offical way - is to place spacers between bump stop barckets and the axle pad, lower the vehicle on to the spacers, and using the EASUnlocak software note the height sensor readings (they may all be ifferent to eachother mind) then plug these values into the required height write settings box and write them to the ECU.....repeat for the next ride height with the next size spacers.....this is the only way to properly calibrate the height sensors.....after doing this and you still have a lopsided vehicle, then further investigation is needed.
 
newt888 said:
Fitted replacement sensor,
Used the "write " section to re write target heights
I'm still getting uneven readings
When I deflate bags I'm getting near on 65 on osf and both rear , however the nsf is reading 46 that's a difference of 20 points! That means the nsf is reading lower than sitting on the bump stops!!

When people mention recalibrate I would of thought that this is where it started, deflate all air and re write sensor values from this " control/ base" setting,
How do I recalibrate the NSF sensory to read 65 when on bump stops?? Or can it not be done?
Click to expand...

You don't calibrate with it on bump stops. Select access height on dash and then move lower corner up in increments until it sits level. If you want to just write 65 into that corner and save to ECU and see what you get. Make a not of all settings before changing anything. Have you read the instructions that come with EASunlock maybe you should.
 
Last edited:
Surely manually setting the ride height( checking the real measurements outside) in the height section and using the up and down features to set the heights you want then transferring the height reading into the write box will be sufficient ?
If I do this I'm am 20 points out on the near side front!!!
 
Saint.V8 said:
Each sensor may indicate different readings for the same ride height as the height sensors are not prescion made....

i.e.

NSF Access = 65
OSF Access = 72

So aslong as the phsyical real world measurements at access between the centre of the wheel arch and the centre of the Wheel Rim = 405mm all is hunky-dunky....

Ensure the vehicle is on the flattest bit of land you can find, lower the vehicle to Access, measure the physical height - should be 405mm in access - using the EASUnlock Software adjust the low side by a couple of digits up wards and write this value to the system, raise the vehicle to standard and back to access and re-measure the physical ride height and note the change.

It will be an iterative process of going back to adjusting the values until you get pretty damn close all round.

The other way - the offical way - is to place spacers between bump stop barckets and the axle pad, lower the vehicle on to the spacers, and using the EASUnlocak software note the height sensor readings (they may all be ifferent to eachother mind) then plug these values into the required height write settings box and write them to the ECU.....repeat for the next ride height with the next size spacers.....this is the only way to properly calibrate the height sensors.....after doing this and you still have a lopsided vehicle, then further investigation is needed.
Click to expand...


And don't be sat in the car when you do it.
 
newt888 said:
Surely manually setting the ride height( checking the real measurements outside) in the height section and using the up and down features to set the heights you want then transferring the height reading into the write box will be sufficient ?
If I do this I'm am 20 points out on the near side front!!!
Click to expand...


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.
 
wammers said:
You don't calibrate with it on bump stops. Select access height on dash and then move lower corner up in increments until it sits level. If you want to just write 65 into that corner and save to ECU and see what you get. Make a not of all settings before changing anything. Have you read the instructions that come with EASunlock maybe you should.
Click to expand...

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!!
 
You must log in or register to reply here.

Similar threads

D
L320 suspension query
Replies
6
Views
371
Graculus
Graculus
K
Is my RR Classic in EAS shutdown?
Replies
12
Views
781
kevleaper
K
feyniriel
P38 EAS problems
Replies
18
Views
1K
pwood999
pwood999
Flossie
P38A Eas issues
2
Replies
22
Views
1K
Datatek
Datatek
S
Height suspension / sensor issue - can't calibrate
Replies
3
Views
972
Graculus
Graculus