Thread: D3 stuck on it's guts

I think I've narrowed it down to the compressor not pumping air into the tank. I cracked the release valve on the air tank after running the compressor several times and there was no pressure in it.

Just seeing what connections I have to try and put air into the tank using another compressor.

My old man has a 13plate Disco 4 and unfortunately it has a different looking compressor, I was going to put his in and see if it fixed the problem!

The later compressor is an upgrade that involves shortening one of the hoses so once fitted, the old style can't be refitted.

Fault code C1A20 should be logged if the compressor is too slow at filling the reservoir. If it is then empty the dryer of its contents and try again.

I have successfully temporarily attached a tyre compressor to the inlet tube in place of the filter (inside the vehicle behind the left tail light cluster) but that also required some sort of clamp (small cable-tie or fine wire) on the ends of the little hose that's fitted between the compressor sump and another spot to prevent it being blown off when the tyre compressor is running.

Edit: There's a different fault code if the vehicle doesn't raise quickly enough. The reservoir isn't filled until the airsprings are up to height so C1A20 probably wont be seen if the vehicle doesn't raise properly.

Originally Posted by Epic pooh

Mine has successfully lifted from completely deflated state (bump stops) without issue when doing work even when my sensors were mildly out of calibration.

I'd be removing llams as suggested by Graeme and then clearing fault (or hard reset) then try to raise suspension. If it doesn't raise, it would be interesting to see if it is the same fault or some other fault.

If the vehicle was at a higher setting than normal (via LLAMS or rods) prior to it dropping to the bump-stops, then in most cases it will NOT rise. Not sure if that was the case here, but worth a try.

Cheers,

Gordon

Originally Posted by gghaggis

If the vehicle was at a higher setting than normal (via LLAMS or rods) prior to it dropping to the bump-stops, then in most cases it will NOT rise. Not sure if that was the case here, but worth a try.

Cheers,

Gordon

It was at a higher setting due to llams before it dropped to the bump stops. I have since removed llams but still can't get the car to rise

Because the compressor runs for even just a moment indicates that the suspension module is trying to raise the vehicle.

Originally Posted by Graeme

Because the compressor runs for even just a moment indicates that the suspension module is trying to raise the vehicle.

Would this indicate that the compressor is not functioning properly? When I check the tank pressure via my nanocom it is not registering any change in value.

The air-springs have priority over the tank so if the vehicle is not being raised then the tank will not be filled.

It does seem that the compressor is not pumping. An air dryer (black plastic container with screws in one end) is part of the compressor assembly and often becomes blocked. The dryer can be unclipped by rotating after removing 1 screw. With the dryer removed, dismantle the dryer and discard what's left of the dessicant then reassemble and refit. There's also an inlet valve on the compressor that wears out - a repair kit can be purchased as can new dessicant for the dryer. However there is a possibility that the compressor has worn-out beyond repair in which case a new-style compressor kit should be obtained. The new compressor uses updated software mostly to lower the reservoir pressure (to make the compressor last longer) but it will run with the existing software.

Thank's heaps for all your help Graeme! If you're ever in Newcastle or Dubbo let me know and I'll shout you a beer or four.

I pulled apart the dryer, there were a few discoloured balls in there and the filters were clogged up. I cleaned it all up and put back together. After that I checked the air pressure coming out of the pump and found that the air was just going back into the crank.

I'm going to have a crack at a repair kit before committing to the expense of a new compressor.