Here's what the book says:

C1A2064 Pressure Increase Too Slow When Filling Reservoir:

• Compressor fault
• Reservoir pipe air leak
• Reservoir air leak
• Gallery pipe air leak
• Intake filter blocked/restricted
• Intake pipe blocked/restricted
• Air suspension intake silencer blocked/restricted
• Corner valve stuck open
• Pressure sensor fault

Refer to the guided diagnostic routine for this code on the approved diagnostic system. Check the Air suspension intake pipe and silencer for blockage/restriction.

Seems like you're all over it. Can you apply an external air source to the reservoir valve input line while reading the pressure sensor live data? Or cobble together fittings to an air gauge and test the compressor output? I don't know how hard it is to get to the "intake silencer" per the book, but if it is restricted, that would surely make your compressor suck! The Arnott compressor has a large intake tube that is easily disconnected to remove any restriction for testing.

 

recent update, dumped air down to bumpstops. Then disconnected intake silencer. Went into test valves and manually put air into bags to get back to access height. (Roughly) then back out and went into re enabled eas. When I toggled paddle up instantly car popped up to normal ride height and compressor continued to run. Went into live valves for compessor temp and gallery pressure. Gallery was steadly climbing and due to just running the compressor manually I shut the rover off with 160 gallery and 242deg Compessor. Dont know what temp it will shut off at but dont wanna find out. Let it cool to about 145*f and restarted rover. Completed cycle to 258gallery AMD not faults. Only thing I could note is when I re enabled eas I heard the center block valve solenoid click and instantly car popped to normal height. Gunna rule this one down to a bad center block..

 

Also pulled driver kicker panel and pulled hanesses. Recent driver sunroof drain failure had a push pull connector leak. Sprayed crc in all connections. Didn't see any corrosion but cleaning them couldnt hurt.

 

So a further update, bought a new center valve block from lucky 8. Was certain this would resolve the problem. Unfortunately, thats not the case. Still getting pressure increase too slow and every once in a while air supply faults. Cant find any leaks, replaced compressor, front and center valve blocks, checked all fuses and relays, cleaned every connection with crc spray, reflashed and so on.... Tried to test valves and manually force air into bags. Entire systems is empty and cannot get get gallery above 70psi before it faults. At this point I'm not sure where to chase this damn problem. Tried several amk pumps. Would be nice to try a hitachi and reflash. I almost wonder if every damn amk ive got is ****!

 

Do you have a different compressor, like a decent tire or even a nice shop compressor? I would say its time to get creative with one and create a push-connect adapter with a check valve and ideally a pressure gauge in there some place. Inflate the gallery manually and observe pressure against the physical gauge and the sensor reading. See what is really going on. Then you can 50/50 the issue. Either plumbing and you simply have not found the leak or the compressor.

 

Ive thought of rigging something up like that. Might try another compressor. I just have a feeling these amk compressors are a roll of the dice. May get a Hitachi and replumb.

 

Might be where you are buying them from more than the fact that it's the AMK. I've heard good/bad things about each. I have an AMK on my '05 and a Hitachi on my '06. I'll let ya know which one craps out first!

 

Get some air line (6mm I think) and make up a pressure gauge and bench test the compressors. So basically the other way of what I said. They should get up to 250Psi very quickly on the bench and then the exhaust relief will kick in so they dont over pressure.

Let me put it this way... If you test the gallery and it hold pressure AND you test the compressors on the bench and they are fine, we are back to wiring issues.

 

Well after 3 new amk pumps that all are garbage found a Hitachi at a junk yard and guess what, problem solved. Zero faults and now just need to plumb everything and get a bracket. Moral of the story, amk has to much crap getting circulated. 1 amk was $1000 and 1 was $179. Both with new brackets and relays. In my experience ill never buy anything from amk again. Lots of time and money wasted and a junk yard part covered in mud was 10x better then new amk trash out of the box. Hope this headache can save somebody in the future. Thanks for everyones help along the way 🍻

 

This thread is a novel, so I am not going to read back to start and try to find what I am going to ask if you dont mind.

But each compressor requires a software change in the truck. Meaning when the hardware is changed, one must change the software.

1 - With the original issues, was that truck equip with an AMK originally and worked fine until it did not?

2 - Did you ever verify the software was set for AMK?

3 - When switching to the Hitachi, did you change software?

If you never made the software change to the Hitachi and its working, I have to think that is what the software was always set to do the AMK would never work right, it was "out of spec" as far and the computer was concerned.