SLS problem

[Yakuza]

Hi, after my disco went onto an hoist the rear bags have deflated and it doesnt want to pump back up, i checked the nanocom reading for transport mode and is disable, i hear the pump for about 5 secounds and thats it

any idea as to why? the bags are pretty new too.

[lewy]

can the nanocon rum the pump with the solinoids open.pump it up manually to about normal height and see what happens.This happened to mine but cant remember the fix,it was simple,try unhooking the battery for 10 mins,make sure you have the radio code

[Yakuza]

I tried to pump it up manaully but it says unable to achive stored heights

[sierrafery]

Maybe momentary bad contact along one sensor's circuit occured and it lost calibration, pump it up to even level or if you can't jack it up as to be on normal level and store those heights as target again ... neglect figures only the physical height is important ...also see if there are any fault codes logged and if it is clear the memory

[Yakuza]

I checked for codes and there were none, and i cant inflate the bags and it wont work

is there an way to jack the car by the tow bar and try to inflate then that way or check that the sensor is working?

This has all come about, as it was working today, went on an hoist and now is screwed

[sierrafery]

Are you trying to inflate with "raise" command in the calibration menu? ... you can check sensor inputs with nanocom as well in the "inputs SLS" menu

[lewy]

jack it up as to be on normal level and store those heights as target again

Yes that is what i had to do. dont know why it happened,'Hasnt done it since.Perhaps my tyre place left the key on or something.

[Yakuza]

I am trying to raise it up to normal height, but even with the raise setting in NANOCOM is gives me an error of "unable to achieve results or something like that

I should also add it has an 2inch spacer on the bags but the sensor arms are not extended, that's how I bought the car.

[strangy]

I ....... I should also add it has an 2inch spacer on the bags but the sensor arms are not extended, that's how I bought the car.
This may be the issue. Depending how the vfehicle went on the hoist.
The rear may have reached full travel and the sensors been damaged from not having enough travel due to lack of extension arm.

Jack the car from the tow bar to correct height.
Pull the compressor relay.
Disconnect the sensor arms on at a time and with Nanocom, check readings throughout the sensor range.

Make some extension brackets while you are at it.

[rob tilbury]

The bags were left deflated for a week while waiting on the new box ,
so what i did was jack the rear of the car with a 8 ton jack ,,( under the tow ball )

started the car ,,
then after the pump ran for 20 or so seconds it lifted off the jack

Maybe the potentiometer in the height sensor is dirty at that point as they dont normaly get that low ??


Hope it helps ,,, havent had a drama since

[Yakuza]

What should the sensors be reading? In NANOCOM?

[strangy]

First things first.
Ensure all doors are closed as the system will not inflate correctly otherwise.
The std ride height is 61.5 mm from the tip of the bump stop to the housing. (lets call it 62mm)
Your space blocks (assuming 50mm ) need to be added so the new bump stop measurement is now 112mm.
From Nanocom:

Left/Right current height: These are the current heights of the vehicle. In order for the
SLABS ECU to know how high a corner of the vehicle is at any given time, it uses a
variable resistor which is attached between the vehicle body and hub assembly. The
varying value is then put through an analogue to digital converter. This results in a
numeric value between 0 and 255 being obtained by the SLABS ECU which represents
the relative height of the corner. In real terms, each number is worth approximately
1.4mm of motion. There are, however, certain tolerances in the mounting and design of
the suspension and the resistor. This means that on one corner of the vehicle a specific
arch height may equate to a different number than the one derived from the same arch
height on the opposite corner.
Left/Right TARGET heights: It is not possible to read the stored heights. When you read
the settings these fields will be filled with N/A. In the fields above you can read the
current heights. If you want to change the stored heights, replace N/A with the value
you want to change it to. Click on Store Target Heights to store the values. Reread
settings to see the new current heights.

Confirm the readings and range of the SLS sensors as per previous post.

Id be making some sensor arm extensions (just a simple piece of 3mm plate with 2 holes in it) to have the sensor range approximately midway with the vehicle set at 112mm bump stop clearance.
Then save the new settings.

[Yakuza]

It says the one side is 120 and the other is 119

How long do I make the brackets 30mm?

[strangy]

It may be 30mm I don't have a set in front of me. To be sure -with the car jacked on the tow bar or chassis with correct, even, bump stop height, move the sensor arm til you get mid range reading ( your 119 and 120 is pretty close.) then measure the distance between hole centers of the sensor arm and radius arm. That's the distance required between holes of your spacer.

Just to be clear this isn't necessarily the reasons the bags are not inflating, but should be done anyway.

[Yakuza]

Ok and I measure from the bump stop to the sensors box?

[strangy]

Ride height= measure from tip of bump stop to pad on diff housing.

[Yakuza]

Ok I will do that and see what happens with the sls

[Jason789]

I know that it appears to be sensor related but just a different train of thought...

My SLS over the past 12 to 18 months had randomly been not fully maintaining correct height. Very recently, the compressor failed and I replaced it. No more problems. The difference in the noise made by the(I assume) original compressor to the new and relatively quiet secondhand compressor was fields apart.

Just something to consider.

Cheers,

Jason

[jwb]

I agree with the comment about the compressor. I just put in a new piston seal and o-ring on mine and it's amazing how quickly the little thing pumps up the bags to off-road height now.


It's a really simple preventative maintenance job and highly recommend it.
$40 parts and half an hour task.

[Fluids]

I put a Bag Piping Andy kit through mine around 12 months ago .. wasn't having issues but figured that at 11 years of age the compressor has done an awful amount of work and did it as a preventative maintenance issue ... definitley pumps up quicker ... and don't forget the SLS air intake filter that's behind the left tail light assy !!

[jwb]

Re the SLS filter. I bought the assembly which is the filter and hose RQB000540 - $50 online, $100ish from LR.
I think next time I'll just find some fibre filter pad and foam and make my own replacements it's just a simple filter. There appears to be filter pads for the P38.

[Fluids]

I originally just dismantled mine and washed it out ... took alot of squeezing with plenty of water and detergent to get it reasonably clean ... and the quite a while to fully dry. It's very dense. That was good for 4-5 years until I did the SLS compressor rebuild and fitted a new filter at the same time.

[Yakuza]

Ok and the sls air filter, you have to remove the tail light to get to? or its behind it?

Ok i did an test and this is the result,

I lifted the car from the tow ball just enough and pressed the extended mode in the car and the compressor start to pump it up and i dropped the jack down and the nanocom said it sat around 180R and 179L

The compressor went for about 20 seconds so it is working, but now the car is back to its lowered state and i havent yet put the extension arms in for the height sensors, I will do that sunday and see if the car repsonds better to it.

Thanks so much for the help so far :)

[Fluids]

Yep. Remove upper LH taillight. Filter is behind. Line disconnects from underneath the car, rear quarter.

Sent by iPhone using two tin cans and Forum Runner

[lewy]

I run two of these iBlackridge Inline Moisture Filter, Disposable - 2 Piece - Supercheap Auto Australia (http://www.supercheapauto.com.au/online-store/products/Blackridge-Inline-Moisture-Filter-Disposable-2-Piece.aspx?pid=291153#Recommendations)nside the vehicle

[Pedro_The_Swift]

They just screw together Lewy?:cool:
and how did you connect the compressor line?

[Fluids]

Says attaches straight to spray gun .... 1/4"BSP M&F i'd guess ... only 70psi max. I'd be connecting it after the filter / before the compressor inlet.

Good idea !!

[lewy]

Here is the dryer and filter,the filter came with the vair compressor i have fitter for the sls,it is mounted inside the grey box were one of the seat used to be.The full size pics are in my gallery as well as the butchered original compressor i used so that i could use the standard solinoids.

http://www.aulro.com/app/data/500/thumbs/WP_20160710_07_47_39_Pro1.jpg (http://www.aulro.com/app/showphoto.php/photo/26427/title/wp-20160710-07-47-39-pro1/cat/500)
https://www.aulro.com/afvb/images/imported/2016/07/862.jpg (http://www.aulro.com/app/showphoto.php/photo/26426/title/wp-20160710-07-46-54-pro/cat/500)

[Yakuza]

Well i fitted the extensions arms and levelled the car out at about 102mm as the spacer is 40mm high

My nanocom reads 145ish so does this include extended mode or is this the normal height?

[sierrafery]

Well i fitted the extensions arms and levelled the car out at about 102mm as the spacer is 40mm high

My nanocom reads 145ish so does this include extended mode or is this the normal height?

those figures are irrlelevant, they can differ from one sensoe to another it's only for referrence the physical height is important

[Yakuza]

So the phyiscal measure should be 102mm?
(40mm spacer plus 62mm ride height)

yeah?

[sierrafery]

IMO the physical status based on stored target heights of the SLS should be so as the measurement from front to be equal with the rear all around cos there can be differencies from one vehicle to another according to various elements.

[strangy]

Just for clarity.
With the spacers installed and the correct height (102mm) set.
The readings from Nanocom are 145 at this height. Normal mode?

Have the new readings (145) been saved?
If not the SLS will attempt to level at the previous 119 and 120.
The Off Road height should elevate another 40mm.
Using the approximate 1.4mm for each numerical output -suggests a target output reading of 175 ish for off road height corresponding to a bumpstop clearance of 142mm inclusive of your spacers.
If the normal ride height has been set and values saved - the off road mode height should take care of itself.

Importantly: Is the SLS operating to approximate height now?

[Yakuza]

Well i got some Spacers and it all seems good and working as per normal,

Thanks for all the help :)

[Yakuza]

Sorry to bring this up again, the SLS is doing its job in normal mode, but when I press extended mode it pumps for an bit then stops and I can't get to go 175 on the nanocom

[jwb]

Does it go up at all? You might have a tired compressor. You can get a replacement service kit like this:
Land Rover Discovery 2 Range L322 Wabco AIR Suspension Compressor Repair KIT | eBay (http://www.ebay.com.au/itm/LAND-ROVER-DISCOVERY-2-RANGE-L322-WABCO-AIR-SUSPENSION-COMPRESSOR-REPAIR-KIT-/161035180877?hash=item257e71db4d:g:-kkAAMXQDnpTa4Pg)

[Yakuza]

I can hear it trying to pump but it doesn't go up, I bought the repair kit and I'll do it tomorrow as see, because I have the car at level height and went off road now it's OK bunpstops, don't know if an bag it leaking

[Yakuza]

I changed the piston ring and what do you know, it pump right up and works good for now at least :)

[thai_tiger]

well done keep at it, as said it is a great system when working correctly, better than coil for my money.