2006 NAS RRS won't lower C1A1364

hey all,

my RRS is still killing me with this C1A1364 code: Pressure does not decrease when venting the gallery

I have a brand new hitachi style compressor
i have a brand new reservoir valve block
i have double (and triple) checked my plumping at the main valve block
i have inspected all of the wiring and plugs at the compressor and valve block
i have inspected all of the wiring and plugs inside the driver fender liner

if i clear codes, i can lift the truck up. it will occasionally ding and give me the amber light, but i can clear and resume raising. the code is always C1A1364.

if i try to lower, it's an immediate ding and amber light.

i'm not sure if it only appeared today, or if today is the only time that i've ever noticed it, but the message center did complain about an obstacle under the vehicle (untrue).

i am sure the calibration is out of sorts, but i can't seem to do anything with it until i get this code gone.
i'm thinking about checking the exhaust muffler, but where the hell is that thing?

thanks!!!

i'll also add that if i take my foxwell and tell the truck to deflate all bags, it goes through the motions but the truck doesn't lower and then it says "complete"

i have loosened the tank connection at the reservoir valve block and am draining the system with a slow hiss, at which point it deflates i will recheck things

Hi

on the end of ur compressor ur see 2 x pipes , pull them out and see if it goes down , one pipe goes to the silencer and the other pipe goes to the air filter inlet

if not it sounds like ur height sensors need calibrating , have u replaced any

the exhaust muffler is tucked up by the passenger rear wheel , , ooops, drivers side in ur case , looks like a round 4 inch canister , very rare they block up but not unheard of

plus u may need a better diagnostic reader , can it re calibrate the suspension

another thought is the front and rear valve blocks can get blocked with old siica from an old compressor , is very fine dust , u should be able to see the live data of them opening or not

when I had a nightmare with mine I had to disconnect pipes and blow them out with an air compressor ,

hope that helps

Also don’t know if you’ve got this already

https://www.disco3.co.uk/gallery/al...ver factory D3 air suspension description.pdf

Gstuart, you’re a sight for sore eyes.

I do have that from you already, thanks! I decided to pull out the reservoir valve and really REALLY disassemble it. It was clean when I put it in, but when I took it out this time it did have a bit of desiccant dust inside. I fully disassembled the reservoir valve plunger and reinstalled.

Now, if I clear the code and press the down button, it will lower a smidge before erroring out.

I will pull the front block and clean it out as well... not looking forward to the rear block. Wish I would’ve used my DMM to test continuity between the plug in the fender and the plugs at the compressor.

I pulled the intake/exhaust lines to the pump and no change. I can blow through them with my lungs too.

Also wanted to mention that I have the nanocom EVO as well as the foxwell, but even after fixing my canbus problem, I still get comm errors when trying to query the air suspension. Both tools. I can see live data but when I try to calibrate suspension it tells me security/access denied

It seems very like your suspension ECU is fubar.... btw as you did so many jobs on it are you 100% certain that you didnt mix up somehow the pipes ? cos there is a point on the valve block where 2 pipes are very close to each other

reverendalc said:

Also wanted to mention that I have the nanocom EVO as well as the foxwell, but even after fixing my canbus problem, I still get comm errors when trying to query the air suspension. Both tools. I can see live data but when I try to calibrate suspension it tells me security/access denied

Click to expand...

hiya

didn’t realise ur having the issue with the ecu and agree with @sierrafery that it could be fubared

have u done a hard reset yet, it’s where u disconnect ur battery ,move the leads well away from the battery posts , then touch the neg and pos leads together , make sure u don’t touch the battery posts , leave connected for 3 x minutes then reconnect

have u removed the suspension ecu with the battery still connected

let me look through some of the tech details I’ve got to see if I can find anything more that may help

Also have u reset ur steering wheel angle sensor , ur nanocom can do that

sierrafery said:

It seems very like your suspension ECU is fubar.... btw as you did so many jobs on it are you 100% certain that you didnt mix up somehow the pipes ? cos there is a point on the valve block where 2 pipes are very close to each other

Click to expand...

hiya

didn’t realise there was this security issue and indeed does sound like it’s knackered , think I saw something about this and see if I can find it

have heard that if an ecu is disconnected and reconnected with the battery still connected it can sometimes cause a power spike and damages the ecu

plus this being a RRS has the hydraulic roll bar system like the ACE on a D2 , but shouldnt have any bearing on the air suspensions electronics

Found some info on the nanocom , see u can see live data of the valves etc

https://www.nanocom-diagnostics.com...m-evolution-can-bus-functions-coverage-manual

Also have u checked the ohms resistance on ur canbus via ur OBD2 plse using a multimeter

Check between the PIN 3 and 11 and then between the PIN 6 and PIN 14

Plse let us know what they are , thks

Also did u check the 3 x connectors behind the front wheel arch liner, will be ur drivers side

Full suspension pdf file, press download after opening link

https://onedrive.live.com/?authkey=!AMrvOm7c4l3jJkg&cid=4BC2D89C85C7C171&id=4BC2D89C85C7C171!2116&parId=4BC2D89C85C7C171!1330&o=OneUp

RRS workshop manual on suspension

https://onedrive.live.com/?authkey=...71!26585&parId=4BC2D89C85C7C171!26574&o=OneUp

Double and triple checked the plumbing at the valve blocks.

my canbus is fine (just went through that whole deal with the IPC)

checked all wiring and found no issue.

I haven’t hot plugged the EAS ECU. I do have a spare EAS ECU I could try. I’m also wondering if my hitachi style compressor is faulty

i have a new hitachi style compressor arriving tomorrow just for ****s. i'll try swapping out the EAS ECU, it's an SOB to get to.

i have reset the SAS and even disabled/re-enabled the EAS. both my foxwell and my nanocom bug out when i try to query the valves. i'm thinking it's either the wiring and/or the ECU.

So I replaced the compressor again (manufacturer sent me a free replacement) with no satisfaction. When I had the compressor down I saw this pipe:

what the heck is that for?

ok, so now my SAS appears to be buggered... check this reading out:


what the hell lol. now i have HDC unavailable and parking brake error on the dash. FML. 5773 degrees, sounds like i've broken my steering wheel off.

i now have these faults in the RLC permanently, they reappear immediately after clearing (or they don't ever clear):


this is what happens when i try to query the air valves with my foxwell:


when i try to query the valves with my nanocom:

and that error alternates with this error:

after those errors i'll have to unplug and replug the nanocom

i also get this error which is odd, because the engine is definitely NOT running:


when i try to run one of the air suspension programs, i get an error as such (failed to close front crosslink valve):


here are height readings via the nanocom:

it's interesting because the RR and RL wheels have the same height, but it reports differently. also, the 4x4 display shows all wheels are nearly lined up.

super strange, all of my valves read 0:



and here are my new friends on the dashboard:


at least my new gauge cluster only reads 78K miles, that's about half the actual mileage! luckily it's odometer exempt now hehe.

HELP!!!!

IMO the suspension ECU is fubar