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Hummer H2For those who like a little more gleam to their Hummer, the H2 offers a similar rugged look as the H1, but as a lower cost, and with more added features, making it almost a massive luxury SUV.
Ok. Looks like it will only depressurize if it is not on the Jack stands. So I did that then jacked it up to my desired ride height. Then ran the trim level calibration and still nothing. It doesn’t ever say calibrating.
It could be your ride-height sensor readings are a little bit too high to start with?
Only theorizing how the software works, but the sensors should be nominally be 2.5V each when at the correct mechanical height (+/- 0.2V ish)
So a normal working range is approx 2.0V to 3.0V (maybe +/- 1") seems about right. With the extended 2" ride-height switch set the values increase to approx 3.4V, i.e. very close to yours.
Here is a quote from MixManSC (visit this link)
"from the GM service system as well. The sensor voltages should be between 2.06 and 2.88 volts when sitting on level ground "
Hummerz also has some suggestions involving a tape measure on this link
For example here are mine:-
It seems logical to assume the calibration software will not accept values that are too high, perhaps you're attempting to increase the ride-height too much?
This procedure may help:-
Check the mechanical height then try calibrating
Hopefully you'll get it fixed, please keep us posted
You are probably right Ocean, I’m want it in the 3 volt range and the computer don’t like it. I just wanted a little more clearance for the tires. I guess the only fix/cheat would be to make a little bit longer sensor arms to fake out the computer. I don’t know if I want to go that far.
I need to get some factory shop manuals that have all this information. Just so damn expensive.
I did extend the sensor arms on mine but I also added 2" spacers under the air springs. I wanted to keep it within the centering range to have the same up/down travel. Extending the sensor rods was pretty easy, then you have to figure how long to make them be. Cut the rod in half, run a 1/4-20 die down each side, then use a tube nut to attach the two halves with two regular nuts further up. Adjust while watching the sensor voltages on the tech2 to figure the length needed, then lock the secondary nuts up against the tube nuts (I then also added some JB Weld over the joints to be sure they stayed. I had to do it this way since I added the spacers under the air springs as I wanted a small lift but still maintain the proper functionality and travel of the air suspension.
Careful if you have the sensor rods loose from the sensors with everything on though.... It will just keep on inflating or deflating trying to get itself to the correct voltage.
Not exactly..... There is a factory plastic centering cup mounted to the top of the perch which is just to make sure the bottom of the air spring stays centered over the perch. The perch itself is designed for a coil spring or to have that plastic centering cup attached for a air spring. I used aluminum coil spring spacers, then sourced longer bolts and mounted the coil spring spacers with the plastic centering cups on top of those.
OK tried to learn level again keeping it under 3.0volts went with 2.92V. Didn’t learn, then dropped it to 2.82V just for the hell of it and it took the learn. So I guess the threshold for learn is somewhere between 2.82 and 2.91V. Didn’t want to mess with it anymore so just left it there. Better than it was and close to what I wanted.
