Bootsy1968
Junior Member
I have a 2018 Ram 2500 with rear air suspension. Does anyone know how to calibrate the sensor for the rear air suspension. Thanks
Nine leans 1/2" on the passenger side
Nine leans 1/2" on the passenger side
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Hey guys, I made a quick video for how to write suspension values with AlfaOBD on my 2016 Ram Rebel. Here it is:
Hope this helps everyone!
Do you still have videoHey guys, I made a quick video for how to write suspension values with AlfaOBD on my 2016 Ram Rebel. Here it is:
Hope this helps everyone!
Probably not the best idea. Do a proper leak check. I have learned this lesson the hard way and spent money replacing parts that didn't need to be replaced. In my case, the leaks have been on the fittings on the tank and tank manifold. If you have AlfaOBD, use it daily to check the air mass in the air suspension, it should stay pretty consistent. The make up air routine is pretty obvious and sounds a bit like a whistle behind the tail light. You'll hear it cycle between the whistle where it pulls outside air then a slow air release to dry out the desicant beads in the drier. It will repeat these cycles until the tank is topped up. You will see vent and compressor temp related DTCs if you have a leak.
If you suspect you're losing air and hear that the compressor is pulling outside air in every few days then you need to find the leak. Grab a spray bottle pull the rear fender liner / dust shield and spray all the fittings on the valve block, back of the compressor, and the air tank. In my case, it was pretty obvious I had a leak at the fill ports and at the tanks (see pictures ). Pulling the fittings and cleaning the orings fixed it but I would recommend sucking it up and replacing the fittings even though they costs $10-20 a piece. I cleaned them and it worked until it didn't because eventually one line slipped out of the old fitting and I had a 120 mile drive home on bump stops. Buy new fittings.
Next, spray down the fittings going to each air bag and check for leaks there. From there, spray down the front struts at the base of the shock at the end of the dust boot and really just spray the whole thing down to check for bad air springs.
Finally, if there are no leaks in those places but you're still losing air, then it's most likely your rear air springs. Buy some long zip ties to replace the zip ties securing the dust boot. Raise the truck to off-road 2 then cut the zip tie to pull the dust shield down. Spray down the air spring and look for bubbles. Pull the shield up from the bottom and spray them down again.
For refills, I use an HVAC line set and an automotive cold side fitting (harbor freight). Last time I refilled the system, I vented all the air to atmosphere so the truck was on bump stops. Then I pulled a vacuum with an HF vacuum pump and let it sit a while to make sure I didn't have any leaks. Before releasing the vacuum, I dipped the hose into some air brake anti freeze and let it the air tanks suck it up when I released the vacuum. Air fill set up is in the pictures.
DO NOT and I can't stress this enough, DO NOT pour air brake anti freeze into the intake hose behind the tail light. The the external air intake flows through the drier and to the compressor. Best case you will coat the desiccant beads in oily air brake antifreeze making them useless or worse case you end up running fluid through the compressor and damaging the piston. Let the vacuum in the tank suck up a couple ounces of the air brake anti freeze, don't over do it, it's a closed system so a little bit goes a long way.
Finally to refill, fill the tanks to 175psi with nitrogen then raise the suspension to normal ride height. Keep topping off the tanks as the ride height rises to make sure it doesn't start the air make up routine and pull in outside air. Using AlfaOBD you can refill the springs one at a time using the "complete" option. Top up the tank to 175 between each fill. I found it easier to just command the suspension to normal ride height and just fill the tank as while it's raising the suspension.
At this point, you will be slightly overfilled but the system will vent the extra air. Lower it to entry / exit and you should hear it vent a couple a times. Once it settles to 170ish bar liters for the air volume, you should be good to go.
If you suspect you have some moisture but no leaks, you can drain the system and pull a vacuum to boil off the moisture then refill with the steps above.
Ugh. I want to plug it so badly, though.The make up air routine will run as soon as you start the truck. It's a pretty clear low pitched whistling sound. Don't block the air intake, you're more likely to ruin the compressor and that's a more expensive fix than pulling vacuum and refilling.
Update I have pulled on the nitrogen out vent all bags to atmosphere started all over when truck is on it will not run any test at all just says limp home active. If truck is on ACC I can personally run a few test mainly add nitrogen back into the bags so it's not looking like a low rider but still can't run mass test can't run ride height test and can write limp home still says it's active.Can anyone help me get the air Suspension out of limp home mode. I cant do anything with the alfaobd app on the suspension cant raise or lower, truck just had a motor swap one of the guys step on the top of the air bag when working on the swap long story short i all ready fix the suspension befor and had it working but because the truck sat again for another 3 months its now seems to be lock some how