Ride height with AlfaOBD (air suspension)

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Shotgunwilly

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I was told its part of their procedure after they finish writing the values to make sure the sensors take the new values right away and finalize the procedure. If the test fails, you either set the values to high or you have a faulty sensor and you can go back to write values and adjust accordingly. Cycling the ignition will only make the ASCM read the values you put and will work with it but you won't see the outcome until a few minutes later when the system stabilizes with he new settings.
MrD- did you do all your procedures with a full tank of fuel, the truck completely unloaded and the stock tires installed (per the instructions you posted)? I started the process last night on my new 22 with Ram boxes and bigger tires. I failed to check the factory settings before proceeding (rookie, didn’t read all posts before starting) and I did the Height Sensor check operation thinking it may show stock values. Now I have a fail code C156E and can’t get it cleared. I haven’t gone any further at this point. Any suggestions to get this cleared so I can start over?
 
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MrDazana

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Height Sensor check operation is only used after you set values. the best thing to do is go back to dealer and play " not sure what happened " or find a budsy who you can read the ACSM from and set with his values.
 

Cflor005

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My valve block went bad at 134k miles. While reading up on my issue I took the advice to go ahead and replace the 4 air shocks/springs while replacing the valve block. All went relatively well until I got to the calibration step using AlfaObd.

1) The system will not maintain the 175psi of nitrogen that is specified. The bar-liter reading is around the 280 range. After I do the air mass calculation, the system proceeds to vent to atmosphere.

2) I get a C15DA-00 DTC Payload limit exceeded.

Note: I was not able to run the air mass calculation with AlfaObd (using Obdlink Mx+). It gives me a “procedure failed” error. I ended up buying a Foxwell nt510 elite, which does allow me to run the air mass calculation.

I think my problem has to do with the left front and left rear ride height sensor values. I must have hosed something up because they’re reading 6534mm and 6536mm respectively. This is obviously wrong. Any ideas on how to reset these?

I will try the calibration process with the Foxwell and see if it fixes this. So far I’ve only done the calibration process with Alfaobd.
 

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Cflor005

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I ran through the height calibration process and those two sensors are still reading abnormally high values. I'm going to order two new sensors, change them and see if that fixes the issue.

Also, I came across some additional info on the C15DA-00 DTC. It seems "Incorrect calibration values" can cause the DTC.

 
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Cflor005

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I received the two new sensors. Replaced them and I’m still getting abnormally high values for the Left Front and Left rear.

At this point the only components I haven’t changed are the control module, the front right height sensor and rear right height sensor.Let me not forget the lines.

I am tempted to change the control module. My last resort is to take it to the dealership. They already charged me 2k to replace the compressor, when I told them to change the compressor AND the valve block.
 

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Mister Luck

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Which software version are you running in the Foxwell NT510 ?

Have you looked at Bi-Directional Testing ?
 

Roman217

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So I just did the opposite of everyone and added air suspension to my truck. The sensors can read high/low depending on positioning and just general differences in the sensors themselves. So the values they provide are almost irrelevant. They need to calibrated to have the proper offsets applied between what they read and the ride height they represent.

EDIT: I did not see the screenshot, those are crazy high values. Do you have AlfaOBD?
 

corneileous

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Hey guys, reviving the thread here being that I just came on board a couple weeks ago with the alpha obd and ever since I heard through other means that we can actually rewrite the values for the air suspension, I’ve been having hell trying to basically raise the front of my truck to level it so I can get rid of my aftermarket links.

I can’t seem to get the truck to respond a whole lot from whatever changes I make so what’s the best procedure? I don’t understand where the steps that were first posted at the beginning of the thread come to play where you measure from the suspension arms and then from the wheel hub.

The way I’ve been trying to do this is just increase the numbers from stock to raise and decrease the numbers to lower but after playing with it for quite a while last weekend, I couldn’t get much change out of it so before I mess with it again, what’s the best way to get it level? Thanks.
 

Roman217

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Shoot me a PM and I will send you my phone number and walk you through the process.

Overall it's a matter of increasing the numbers until you get to the height you want but it can be a finicky and tedious process. It probably took me over 2 dozen calibrations to get to the height I wanted and I still need to make some slight adjustments.
 

Dayz

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Guys, I need help here. Doing the same exact thing as this post, or the video, but I cannot seem to re-write new values. It is leaning on the left by 1”.

I use Alpha OBD, re-write values, then either check sensor height, truck goes up and down fine, but always end up at the same normal height, (leaning left).

What am I doing wrong?

1- Connect Alpha OBD - suspension Re-write
2- enter height values measured by hand with a level
3- check sensor height, cycle suspension up and down.

Thank you.
 

corneileous

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Guys, I need help here. Doing the same exact thing as this post, or the video, but I cannot seem to re-write new values. It is leaning on the left by 1”.

I use Alpha OBD, re-write values, then either check sensor height, truck goes up and down fine, but always end up at the same normal height, (leaning left).

What am I doing wrong?

1- Connect Alpha OBD - suspension Re-write
2- enter height values measured by hand with a level
3- check sensor height, cycle suspension up and down.

Thank you.
If I were you, I would highly suggest just starting over with the factory procedure to set your suspension ride height because I never could get that to work where you just change the written suspension heights. I always just ended up with results I wasn't looking for and to fix it, do this:

Park on flat level ground and make sure your tire pressures are good. Grab you a pencil, note pad and a tape measure. On your note pad, make four columns and label them at the top from the left, LF, RF, LR, RR. Then go in your Alfa OBD to the section under your air suspension control module and then click on the selection for writing new suspension values. Initiate that and when the suspension does its thing and then the first option to enter a new value comes up on the screen, grab your tape and crawl under the driver-front corner and measure from the ground to the middle of the lower A arm pivot bolt. Write that number down under your LF column.

Next, measure from the ground to the center of the LF wheel and write that number down in the same column. Subtract the first number from that number and then convert the answer to millimeters and write that number down in the appropriate column.

Next, go to your RF wheel and do the same thing; take the measurement from under the truck and subtract it from the measurement you took from the ground to the center of your RF wheel. Convert the answer to millimeters and write all that down under the second column.

Next will be the LR. Measure from the ground to the center of the bottom control arm bolt and write that measurement down under the LR column. Subtract that measurement from the measurement you get from the ground to the center of the LR wheel. Write that down and convert it to millimeters. Do the same thing for the RR.

Now go to your computer or your android device and enter those numbers you converted to millimeters. After you complete that and it says finished, Go to the setting on AOBD that lets you remotely change your suspension heights to all the different modes and raise it to OF2(OF if its a Rebel) and then down to Entry/Exit mode and then up to normal ride height. That should clear it up but in my case, I had to do all that twice to get it to sit level.

Hope this helps.
 
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Dayz

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Thank you Corneilous. Very well described, I will retry this tomorrow.

The number that I enter, are the ones that I measure ( delta from Hub Center to control arm bolt). I guess the computer recalibrates itself? Based on the unequal numbers.

Crossing fingers. That would be awesome if it works.

Erik
 

corneileous

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Thank you Corneilous. Very well described, I will retry this tomorrow.

The number that I enter, are the ones that I measure ( delta from Hub Center to control arm bolt). I guess the computer recalibrates itself? Based on the unequal numbers.

Crossing fingers. That would be awesome if it works.

Erik
The numbers you enter in Alfa OBD are the numbers you get after subtracting the measurements from under the truck from the measurements taken from the ground to the center of the wheel, converted to millimeters.

So for example, if you measure 11 inches from the ground to the center of the lower A arm bolt on the left-front side and measure 15 inches from the ground to the center of the wheel, you’ll subtract 11 from 15 giving you 4 inches and then you’ll convert 4 inches to millimeters which is 101.6mm rounded up to 102mm.

For the rest, this won’t be what you’ll get but just to save a bunch of typing, if you measured the same exact measurements on the other three corners then once you get that last measurement, you’d go to your device and when it started out on the LF, you’d enter 102. Then it’ll ask you to enter the value for the RF. Enter 102. Then it’ll ask for LR- enter 102 and finally it’ll ask you for the RR value and then you’d again enter 102. Let it do it’s thing and then remotely raise it to OF2 and then down to E/E. Then back up to normal and measure from the ground to the wheel arch on all four corners to see where your height are and if the truck is level side to side and has the slightly lower front end rake.

But yeah, essentially the truck calibrates itself but in order for it to be able to do that, it needs to know what to calibrate the suspension to which is why you have to take those measurements on all four corners because those numbers is what tells the computer where your suspension is currently sitting and what it needs to do to adjust it in order to make it sit how it’s supposed to, to factory specs.
 
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Dayz

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I have just tried it again. I re-wrote the numbers - 95,97,96,76

Up to now it works, and successfully completes the test.

I then go in height settings, choose OF2, truck raises while saying lowering in dashboard, and then stops. I tells me to enable the level system. I cannot do anything until I drive the truck, (it falls in Jack mode, I assume), resets itself, then it finishes raising itself to OF2.

I can only raise/lower the truck using the button in dash and not Aobd.

Truck goes back to original level height.

Unsure if someone has any inputs.

It cannot be that complicated, I feel like a newbie here.

Thanks again.
 
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Jacobsen

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2015 ram 1500 crew cab 6.4 bed Laramie limited.
My tires are size 275/60/20 at 42 pounds front and rear. All wheels measure 15.5" from ground to center of spindle.

My measurements are
LF:rear arm bolt 12.5"-15.5=3", 76.2mm
FR:rear arm bolt 12.5"-15.5=3", 76.2mm
RR:front bolt 12.75"-15.5=2.75, 69.85mm
RL:front bolt 12.75"-15.5=2.75, 69.85mm

I just changed out the compressor, valve block and all four Arnott shocks. The trouble I'm having is that I can only occasionally get it to go into off-road 1 and never off-road 2 and am having a constant payload warning with an up and down arrow truck bed icon though the bed is empty and no trailer. Before the replacement I had a really bad leak and a failed compressor. I'm surprised how even the measurements are. Does anyone think the solution would be recalibrating the level sensors with AlfaOBD?

I do not have an ELM 327 but I do have a bafx dongle which works with torque but isn't connecting to alfaobd trial app.
I did order the obdlink MX+ and am waiting for it to arrive...
Anyone know the difference between obdlink mx+ and the cheap ELM 327?
 
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PdPuNOme

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So I just did the opposite of everyone and added air suspension to my truck. The sensors can read high/low depending on positioning and just general differences in the sensors themselves. So the values they provide are almost irrelevant. They need to calibrated to have the proper offsets applied between what they read and the ride height they represent.

EDIT: I did not see the screenshot, those are crazy high values. Do you have AlfaOBD?

Roman217 I myself am in the middle of acquiring all the components to add the air ride too! Tired of aftermarket bags setup just want factory. This will be an easy project for me and plan to mod in a heater and dryer to avoid the common cold weather issues, but any pointers you may have please feel free to DM me! So far compressor, tank, sensors, control module, air line harness, wire harness, and bags are the list I have come up with. Only real trouble I am having is finding info on the control module under the driver seat and the wiring associated with it. Figured out what they call a jumper harness that goes around the chassis for the compressor and sensors, but cannot find info on the module wiring.
 
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