2016 3500 air suspension help

[dodgedaddy]

When i bought this rig, the compressor for the air suspension was bad, I finally got around to replacing it. I put a vacuum pump on the system and vacuumed it down, and charged it w nitrogen A few questions...
Alfa OBD says "system airmass too low", how many PSI should i fill it to? also, i have a C156E code (out of calibration) but when i try to connect to write the values, it errors out. i can look at system part numbers, data, etc but cannot program. Am I missing a step here?
TIA

 

[AH64ID]

It’s an open system, so you don’t need to get too crazy with vacuum and nitrogen.

What have you charged it to?

 

[dodgedaddy]

charged to 160 psi, alfa OBD says its still "airmass low" do i need to have weight off of suspension to calibrate it?

 

[AH64ID]

@CdnHO might be able to help. I believe he’s done some calibration with AlfaOBD.

 

[CdnHO]

@CdnHO might be able to help. I believe he’s done some calibration with AlfaOBD.

I used JScan to calibrate my air suspension. I did the ride height calibration only. It was fairly easy. Hardest part was crawling under the truck to getting the measurments. LOL

 

[CdnHO]

Download the JScan app to your device. Free. Select your truck and use "demo" mode. Go to "adaptations" and then do a search for suspension. Poke around in there to see if what you need is there. Also check the instructions page for JScan. Might be something there. https://jscan-docs.readthedocs.io/en/latest/. They also have a Facebook page that might be of help. https://www.facebook.com/groups/2582861995366601. I think a VIN specific license for JScan is 29 bucks.