Thread: SLS Issues

Hi Richard
If you look at the rave manual it staes that from ride height to extended mode the suspesion raises approx 10mm
If like you mentioned your mod raise to 25-30mm this coun be the problem?
in othe words the sensors reading over the threshold limit.
Try to remove the modification and see how it behaves.
Good Luck
Vince

Thanks Vince. I didnt think the small extension I put on the hieght sensor would cause any issue as the ECU should be non the wiser in terms of actual height versus sensor detected height.

Anyway will give it a go an let you know.

Cheers
Richard

I don't doubt that you have checked the bags for leaks but by experience I can say that at least 9/10 weird SLS stuff is a bag leaking. You may have the 1/10 that is out of left field but if your bags are more than 6 years old then double check. I have had them behave just as you say. Good luck with sorting it all out.

how about you take your extensions out just to take them out of the equation at the moment. (I have run 30mm extensions and now 55mm with no problems, I have modified air bags for a big lift). I have had a relay switch in the fuse box play up and replaced it, this was because the compressor would not stop, wondering if your relay is faulty and stopping things running? The compressor dumps air when in sleep mode so when you load up things can be on the bump stops, is the compressor starting up straight away when car is started ? Strange it corrects its self later on,

Incorporated within the ECU is a counter which times the operation of the SLS system and prevents the compressor exceeding its duty cycle.

I cant recall exactly but the counter is reset after approx 30 mins if the ignition is turned off, which might explain why turning it off will allow it to pump the rear again?

As far as i know the bags shouldn't deflate due to weight (but that said i have had them deflate when hitting a speed hump hard). Or do you mean the rear just goes down due to the extra weight?

You can bypass the ECU and just run a wire straight from the battery to the compressor to test if the compressor is working and the bags are inflating.

The Rave CD says "If, for any reason, the sensors are replaced, or removed and refitted, a calibration process must be completed to ensure that the SLABS ECU knows the correct height of the vehicle. This process involves using TestBook and a set of special setting blocks (LRT 64-003). The blocks differ from those used on Range Rover."

Also just worth a check... check the nut on the air line going into the top of the airbag is done up tight, this is where mine was leaking. But would only leak when the pressure was high ie: when towing etc.

Let us know how you go,