torfi
Member Since: 04 Feb 2021
Location: Reykjavík
Posts: 2
  
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| Pressure increases too slow fault - seconds after starting |
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Hi! I get a "Normal ride height only" suspension warning about 20 seconds after starting the engine, but sometimes it comes on a bit later - often upon releasing the throttle. This has been happening with increasing regularity over the past few weeks.
Using the IIDTool, I can see the gallery pressure slowly rising (1-2 kPa/sec) until the compression cycle is cut short and the two faults below appear with a "bong." The pressure is usually in the 1500-1600 kPa range.
Eight months ago, I had a similar issue, but the fault didn't occur until 2-3 minutes after starting the engine. I fixed it by rebuilding the AMK compressor and replacing the o-ring seals, exhaust valve, and dryer beads. But now the problem is back.
Got any ideas what could be causing this? It doesn't seem like a compressor timeout, since the onset is early and irregular.
Quote:Suspension
C1A20-64 (AF) Pressure increases too slow when filling reservoir - Algorithm based failure - signal plausibility failure
Vehicle Dynamic
U0132-87 (0B) Lost communication with ride level control module - Bus signal/message failure - missing a message
Last edited by torfi on 3rd Feb 2023 10:53 am. Edited 2 times in total
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 2nd Feb 2023 8:42 pm |
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loanrangie
Member Since: 18 Jun 2017
Location: Melbourne
Posts: 599
 
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Has the compressor ever been serviced ?
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| 3rd Feb 2023 4:26 am |
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Lrstaylor
Member Since: 04 Oct 2018
Location: Kent
Posts: 589
 
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He does say he rebuilt the compressor 8 months ago.
Start checking for leaks at the airport tank
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| 3rd Feb 2023 10:04 am |
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Flack
Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6232
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Check that the exhaust valve is not stuck again.
Flack 
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| 3rd Feb 2023 10:31 am |
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torfi
Member Since: 04 Feb 2021
Location: Reykjavík
Posts: 2
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Thanks. If there are no leaks, are there other things to check before writing off the compressor?
Do you know if the rate of pressure increase is being monitored continuously? Is the early onset of the fault simply indicating that the pressure is indeed rising slowly.
Last edited by torfi on 3rd Feb 2023 6:07 pm. Edited 1 time in total
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| 3rd Feb 2023 10:40 am |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8072
 
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Are you running AMK software?- if not you can load it with the Iid tool. It can when others can't,
It will when others won't,
It goes where others don't.
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| 3rd Feb 2023 10:59 am |
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