Discovery 2 2004 Landmark Air Suspension Compressor - No Power

Hi folks.
Just a quick question after many hours reading advice on problems with air suspension. So my Disco rear end dropped onto the bump stops a few weeks ago. I had a complete disintegration of the chassis mount holding the driver's side ride height sensor, and stupidly unplugged the sensor without disconnecting the battery. I bought a pair of 4mm schrader adapters so I can pump the bags to get the welding done and found a link on here from someone who'd made a couple of replacement sensor mounts. But I have no power to the compressor. I checked the 30A fuse with a continuity tester and it beeped OK, and switched relay 3 into the relay 5 slot [both worked in the 3 slot] but no joy when I stuck the multimeter probes into the power socket of the compressor. I understand that I need to get the suspension calibrated due to removing the sensor plug w/out disconnecting the battery, but should there still be power to the compressor? If so, any ideas welcome.
Thanks for reading
NS.

Did you check the fusible link and the fuse in the fuse box? Both are in the circuit.

Thanks westone. Don't know which fuse you mean? If you mean the 10A under the steering column, yes. So I've checked relay, fusible link in the engine bay, and fuse [F28] under the column.

If the ECU lost calibration it might not activate the compressor, to rule out the circuit remove R5 and bridge the perpendicular cavities for a second, if you hear the compressor then you need a diagnostic tool to go further, if FL9 is good and the compressor doesnt kick in with bridged relay we'll speak then

Thanks sierrafery. Swapped over the FL9 as well, but nothing from the compressor with pins 1&2 of R5 bridged.

Its FL9 under the bonnet fuse box,SF is much better at this than me,I will leave it with him.I had terrible trouble with my system.I bought a Nanocom which sorted it out with help from this site.

nonserviam said:

... pins 1&2 of R5 bridged.

Click to expand...

when you say pins 1 & 2 do you mean the perpendicular ones (30 - 87)?, cos on some relays 1 - 2 are parallel(85 - 86) which is the coil, you have to ridge 3(30) - 5(87) and if no activity from the pump measure voltage across earth and 30 to see if you get 12V

Right oh! Haha. Sorry SF. Yeah, compressor initialised with 87 & 30 connected. I took your post to mean perpendicular to me from front of vehicle: div.

Then tepump's circuit is ruled out so you need diagnostic equipment to clear the codes eventually recalibrate the system cos as you bridged the relay's coil the ECU should have deected a short circuit on that so more reasons to not activate the pump.

Thanks for your help guys. So I guess the solution right now is to inflate the bags using the schrader adapters and drive to a dealer? 70km. Might as well order some new bags I guess.

Or you can buy a Foxwell NT520 or 530 and fix it yourself. Main dealers don't give a sh*t these days on such old vehicles nor they have enough knowlegde to fix them right. They'll rip you off by replacing the ECU or who knows what other ineptitude

just popped up this deal https://www.cardiagtool.co.uk/foxwell-nt510-multi-system-scanner.html

Thanks again. I mailed cardiag to check that the 510 on offer will do what it says. The pdf files seem to suggest so. Essential bit of kit really; a diag tool. Never owned a car that needed one before this Disco. Still going to have to pump up the bags to get to the garage and have the new sensor brackets welded on. Should be able to get them made up pretty cheaply. Both of mine are totally shot..

Well, after many months I came back to the Disco because it's time to start carting firewood. Not a job for our Ford Focus. Tried some local bloke to make me sensor brackets. Took him a month and were utterly rubbish so eventually got a pair off ebay, which arrived this week. I did get a reply from cardiag, bit it was a negative on the ability of that unit to set the ride height sensors. Today I got back to the task and I contacted Bearmach to find out which of the diag tools would actually allow me to do it. I was told that Part No. NCOM02 which is the Nanocom Evolution is the correct tool. £400. So if anyone has used anything else to successfully do this job, I'm all ears. Take it as read that I made the mistake of messing with the sensors before disconnecting the battery, because the sensor and bracket came off in my hand
So from a standing start with no other faults in the system and a pair of new sensors, and a functional compressor, what is step 2, and with which machine?

I used my Nanocom to do this......The instruction in part are on the web site for Black Box solutions who make Nanocom.
It tells you the menus

You need to calibrate the system......On one of the menus if you scroll through you will see this option.
You will get a response to wait so many seconds so it writes to the ECU. when you finish the whole thing ...do this. I think its 45 seconds.
Or it will not retain the calibration.

Do not sit in Disco to do this, wind down window and stand outside.VIP....Obvious really but it was not to me initially.

When you get on the calibrate menu you can adjust each side of Disco to get him nice and level.You will hear the compressor cut in/exhaust valve to adjust him up and down.

I used a 1 metre wood ruler to adjust mine to 48cm from centre of hub to underside of wheel arch.I think the figure is this +/- 20mm.

If after doing this you look under settings on Nanocom you may find one sensor is recorded at one height and the other is different,yet Disco is sitting nice and measurement with a ruler confirms this....Do not be alarmed.This is because of differences in suspension, response of level height sensors and other things.

When you have done it, you can try the off road button which raises the back by about 50mm and then lower it to make sure it goes back to where you set it....This is a good test of the calibration holding it may be a few mm out but will settle.

After all is done charge your battery as it will be using up lots of power to do this ....I found this out the hard way.

On Nanocom you do have a thing where you can put a value in for each sensor and then adjust car height ...this is not calibrating...when I did this Disco was leaning very oddly....reasons as stated above.

All this assumes when you start air bags are full...use position 3 on your ignition switch, engine running and connect the Nanocom cable to your Nanocom 1st....not to the car.If you do it wrong it often blows the fuse for the OBD socket.

I am not an expert, but have done this and one year later my calibration is holding...I do check it to see....All this was done after new air bags, sensors and a complete overhaul of the compressor. Plus new fuses.

SF is the best person on the site on this type of thing. not me ..good luck...very satisfying when you have done it.!

nonserviam said:

Well, after many months I came back to the Disco because it's time to start carting firewood. Not a job for our Ford Focus. Tried some local bloke to make me sensor brackets. Took him a month and were utterly rubbish so eventually got a pair off ebay, which arrived this week. I did get a reply from cardiag, bit it was a negative on the ability of that unit to set the ride height sensors. Today I got back to the task and I contacted Bearmach to find out which of the diag tools would actually allow me to do it. I was told that Part No. NCOM02 which is the Nanocom Evolution is the correct tool. £400. So if anyone has used anything else to successfully do this job, I'm all ears. Take it as read that I made the mistake of messing with the sensors before disconnecting the battery, because the sensor and bracket came off in my hand
So from a standing start with no other faults in the system and a pair of new sensors, and a functional compressor, what is step 2, and with which machine?

Click to expand...

Hi, I have a Foxwell NT530 which has the screen 'calibrate suspension' I haven't had to use it for that on my D2 but it seems to be able to do most of the things a nanocom can but for less money so I would have a read up about it. I can plug mine in tomorrow & take pics of the screen if you wish. I've just posted pics of the key programming on another thread.

Andy Warren said:

Hi, I have a Foxwell NT530 which has the screen 'calibrate suspension' I haven't had to use it for that on my D2 but it seems to be able to do most of the things a nanocom can but for less money so I would have a read up about it. I can plug mine in tomorrow & take pics of the screen if you wish. I've just posted pics of the key programming on another thread.

Click to expand...

Thanks for your kind assistance.

I tried to get this info a while back. The chat option on their site never works. Emailed them thus
Hi there. Just read your ad https://www.cardiagtool.co.uk/foxwell-nt510-multi-system-scanner.html and had been advised to get the 520 for my Land Rover Discovery II 2004. I need to run diags and restore function to plus calibrate the SLS. The updated 510 looks like the right tool according to the vehicle list. Just making sure it will come loaded with the relevant software. If not I can order a TF -> USB adapter anyway.

REPLY

Hello, the NT510 can't support the function on your car Land Rover Discovery II 2004

That was it. No indication that any other version would do it.

nonserviam said:

Thanks for your kind assistance.

I tried to get this info a while back. The chat option on their site never works. Emailed them thus
Hi there. Just read your ad https://www.cardiagtool.co.uk/foxwell-nt510-multi-system-scanner.html and had been advised to get the 520 for my Land Rover Discovery II 2004. I need to run diags and restore function to plus calibrate the SLS. The updated 510 looks like the right tool according to the vehicle list. Just making sure it will come loaded with the relevant software. If not I can order a TF -> USB adapter anyway.

REPLY

Hello, the NT510 can't support the function on your car Land Rover Discovery II 2004

That was it. No indication that any other version would do it.

Click to expand...

Strange they didn't suggest the 530. I'll plug it in tomorrow & put the screen pics up. I changed both my sensors a few months ago but as the battery had been off for 24hrs I didn't need to recalibrate.

Thanks for that Andy. I wish mine looked so neat
Had my airbags inflated on the schrader adaptors for the last 4 months so I guess they're still solid. Really don't fancy driving it more than a few km on the crap roads of rural Galicia. If one of the adapters failed I'd be stuffed in the middle of nowhere. Even taking it to get the sensor brackets welded on is going to be sweaty enough and that's only 5 km. Any chance you could post a photo of the other side?

nonserviam said:

Thanks for that Andy. I wish mine looked so neat
Had my airbags inflated on the schrader adaptors for the last 4 months so I guess they're still solid. Really don't fancy driving it more than a few km on the crap roads of rural Galicia. If one of the adapters failed I'd be stuffed in the middle of nowhere. Even taking it to get the sensor brackets welded on is going to be sweaty enough and that's only 5 km. Any chance you could post a photo of the other side?

Click to expand...

These are what I took at the time. I'll get some better ones tomorrow. I'll try & put a rule in there somehow so you can gauge some measurements.

Above and beyond mate. Really grateful.