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Unread 02-05-2016, 03:36 PM   #1
JeepGC4me
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"Ride Height Sol DC" CANBUS parameter

I was looking at some of the data streams available on my mechanics scanner yesterday and saw 4 parameters for "Ride Height Sol DC" (There's a RR, RF, LR, and LF). They are located on the ASCM Diagnostics so have something to do with each wheels suspension. Anyone know what they stand for? The units was %.


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Unread 02-05-2016, 04:08 PM   #2
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Dunno, there are four axle vent solenoid circuits that typically abbreviated as "SOL" in diagrams. They seem to be controlled by DC voltage. The height sensors themselves use AC signaling at 588 to 1000 Hz.
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Unread 02-05-2016, 08:16 PM   #3
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"DC" probably stands for Duty Cycle, which would indicate the percentage of On time for the solenoid. That fits with units of %.
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Unread 02-05-2016, 08:25 PM   #4
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"Ride Height Sol DC" CANBUS parameter

Those are good thoughts. I should have perhaps added that the numbers were pretty steady though, between 42% and 56% for different ones, and not really changing much.



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Unread 02-05-2016, 10:47 PM   #5
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That solenoid is on whenever a spring adjustment is needed. The solenoid opens and either air is drawn out and pumped back into the holding tank, or air is drawn from the holding tank and sent to the spring, depending on the state of reversing valves on the compressor. So if those are duty cycle valves, the valves are opening about 50% of the time to make spring adjustments. But if the Jeep is just sitting there, why are there adjustments needed? I would expect near zero duty cycle, but I dunno. It would be nice to compare to a known good vehicle.

You know ~5 years ago there were a lot of chatter about something in early build Jeeps interfering with the height sensor signals, wipers or cruise control or something, which caused weird operation with compressors running a lot and resulted in many a techs losing hair trying to figure it out... perhaps related..

This type of system has been used by Mercedes for years, perhaps there is some info there.
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Unread 02-08-2016, 01:48 PM   #6
JeepGC4me
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Was at the dealer today (again) but not my own, my vehicle was stuck in Park/Entry ride height this morning and would not rise to Normal Ride Height. They deflated the system and re-inflated it... everything good again. Go figure. Sigh.

What I wanted to say though was that while they were working on the car I got a few glances at the WiTech screens and the "Sol DC" does, in fact, stand for Solenoid Duty Cycle.

Not sure what it means or how it might help warn of an impending problem. Perhaps if I ever get my Suspension working properly again I can figure that part out!


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Unread 02-08-2016, 04:12 PM   #7
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Perhaps a sticky valve in the valve body. Any chance moisture could have gotten in there?
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Unread 02-08-2016, 07:04 PM   #8
JeepGC4me
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Don't know. The dealers have been filling it with 99.9% N2. It was -18 last night.

Haven't had any trouble with anything else on the GC yet, but this suspension is slowly killing me.


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