Intermittent suspension fault when raised

[TuffRR]

Time to start digging into an intermittent problem I've had for a while as it seems to be getting more frequent and has now twice caused the car to drop to its guts off-road.

After a few minutes of driving with vehicle raised (either llams settings or factory off road), the orange suspension fault light appears. Fault codes from most recent time were:

C1A06-78 (28) Rear right height sensor - Mechanical failure - alignment or adjustment is incorrect
C1130-7A (6C) Air spring air supply - Mechanical failure - fluid leak or seal failure

The time it occured the weekend before, fault codes were:

C112F-72 (28) Air spring valve - Mechanical failure - actuator is stuck open
C1130-66 (28) Air spring air supply - Algorithm based failure - signal has too many transitions/events


Most of the time, a restart will clear the code and there are no dramas. Twice now though whilst continuing to drive it has then escalated to a 'red' fault, limited top speed and dropped the car to the bumpstops - not ideal on a rocky offroad track. A restart then clears the fault and the vehicle raises - albeit slowly. I have no other dramas with the compressor - it was upgraded to a AMK from original about 2 years ago. It doesn't droop when parked for any period of time.

The fault codes only occur with the vehicle in a raised height. Running standard height or lower (using llams) does not produce any errors.

Any ideas where i should start looking?

[Graeme]

First step is to fit the Llams loop-back plug so that you know that if you're dealing with a Llams fault or not.

[TuffRR]

Turns out it was probably another front shock/strut failure. Had to replace the passenger side one again (at most 25k kms since last time) due to the internal bit that stops the shock from over-extending failing. This in turn causes the top arm to droop too far and also bend the mounting bracket for the height sensor.
Replaced the shock, fixed the bracket and re-calibrated the sensor/LLAMS and managed to get a whole day of off-road under my belt without a suspension fault (but broke a CV instead. )