L322 AIR SUSPENSION FAULT

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Ruper

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I got this one:
C1A13-64 (28) Pressure does not decrease when venting gallery - Algorithm based failure - signal plausibility failure
( on 28-02-2020 10:44:20 at 222298 mi )

On your compressor there is an exhaust valve assm. Its a plate roundish with 4 bolts holding the plate down. Mine had this issue and so I took apart, cleaned it out, there was only a slight film of white powder inside, however the small solenoid inside vibrates to move the valve back and forth just a hair to exhaust the pressure. I got a seal kit ready for the next time, but since I had to get on the road I took apart cleaned and put some o ring lube on all o-rings and fixed the issue. And also cleared some of the other faults with comms to the terrain control.

Look at this:
 

JJJP

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Any idea how this cracked top of the air suspension might have happened?
Does anyone know if this normal ?

Sport HSE SDV - Diesel
3.0 2014. Front Suspension is broken.
Nearside front Air suspension arm pin or bush warn.

Thanks for the manual.

085D3F9A-ABDF-41C3-AFA0-447A1B0F60D9.jpeg
 
Last edited:

Andymac210

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Follow up: still have the issues. I notice now while monitoring the cross link valves, exhaust valve, reservoir valve and gallery pressure, that when engine is first started after sitting overnight that the reservoir valve opens 100% and compressor comes on. The pressure rises to about 225psi, then reservoir valve closes and the compressor stops. Immediately the exhaust valve opens and dumps air to about 70psi then that valve closes. The 70psi holds but it's not enough to raise the suspension, not even one corner via the Gap tool. Any ideas on what is causing this loss of air pressure? I cannot find any leaks at valves or compressor. Could it be the EAS ECU?
Good afternoon, did you ever get to the bottom of this issue ? as I am seeing something similar. Thanks.
 

CoopLR3

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Lakeranger's follow up sounds like normal operation. At start up, the front and rear valve blocks get first dibs on air from the compressor to reset the suspension height if needed. Then the reservoir valve opens to top off the reservoir tank, and the gallery pressure rises to a max of 250psi. When the tank is full, the reservoir valve then closes, and the gallery vents to a residual pressure around 50psi, hence the loss of air pressure. When raising the suspension, the reservoir valve opens to let high pressure tank air into the system to help raise the vehicle quicker.
 

Mith_21

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bro can you help me out i got the same codes but small changes do u know how to change it... c1131-92 (68)
 

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