Thread: Air suspension wont vent

So today I changed out the RR height sensor and I dont think that was my problem.
The issue seems to be the compressor continually running, I'm not sure what tells it to turn off.
I notice system pressure got to 1750kpa, the compressor stopped at this pressure but I'm pretty sure it stopped due to temp of 107 degrees. The car still doesnt vent unless I force say access height which it doesnt seem to stay in.
I see there is a pressure sensor in the valve block in front of the compressor, I'm wondering if this is faulty and not telling the compressor to stop pumping.
Or have I totally misread how the system works .
Cheers Bulletman

Originally Posted by Bulletman

So today I changed out the RR height sensor and I dont think that was my problem.
The issue seems to be the compressor continually running, I'm not sure what tells it to turn off.
I notice system pressure got to 1750kpa, the compressor stopped at this pressure but I'm pretty sure it stopped due to temp of 107 degrees. The car still doesnt vent unless I force say access height which it doesnt seem to stay in.
I see there is a pressure sensor in the valve block in front of the compressor, I'm wondering if this is faulty and not telling the compressor to stop pumping.
Or have I totally misread how the system works .
Cheers Bulletman

You have. BradC has a complete rundown on here how the system works, plus how it self tests itself etc. see if you can track it down with a google search of the site use site:aulro.com in your google search.

Compressor Issue?

If you have the early Hitachi suspension software it won't vent. This was modified with a software update to vent the gallery to prevent the compressor having to start into a significant head pressure.

If that's the case, you'll be able to update that when you get the IID.

According to the manual, if just filling the reservoir it won't stop unless the head temp > 140C or the brush temp > 130C.

Edit : and this one D3 EAS C1130-66 fault

My car used to vent and you could hear it adjusting the suspension every time I turned it off, now I dont get that at all. Even when I jacked it up to remove the wheel to change the height sensor, the car didn't adjust to the car being jacked, normally when I dropped the jack I would have to start the car for it to raise off the jack , didnt need to do that today with the old sensor and the new sensor.
Maybe I'm looking at it the wrong way but the fact it's not venting seems to be somehow related in my eyes.
Cheers Bulletman

Originally Posted by Bulletman

My car used to vent and you could hear it adjusting the suspension every time I turned it off, now I dont get that at all. Even when I jacked it up to remove the wheel to change the height sensor, the car didn't adjust to the car being jacked, normally when I dropped the jack I would have to start the car for it to raise off the jack , didnt need to do that today with the old sensor and the new sensor.
Maybe I'm looking at it the wrong way but the fact it's not venting seems to be somehow related in my eyes.
Cheers Bulletman

I know mines a D4 but I'm sure they run the same Hitachi. Mine always vents after self levelling or after parking. I reckon you're on the right track with a dodgy pressure sensor. Comp shouldn't trip on overtemp all the time.