120 Air Suspensions intermittent failure

[shanedegen Lurker Find all posts View Profile Close shanedegen]

Hi Everyone
I have a diesel (KZJ120R) Grande that has the air suspension system. It was extremely bouncy so i took it to the mechanic. He replaced one bag but it didn't change anything. Sometimes the compressor is working, sometimes not. He said take it to auto-electrician. I took it there when it wasn't working but it started working, he said the compressor is working it could be something else. He recommended replacing it with standard suspension. I would like to keep it.
Somedays it works, somedays it doesn't. When it doesn't you feel like a milkshake by the time you get to where your going. Does anyone have any experience that could give me some advice
Thanks
Shane
PR FIrst time poster'

[Guest Close Guest]

Replace both bags and check all lines for leaks.

[shanedegen Lurker Find all posts View Profile Close shanedegen]

So i noticed there is a slow leak that happens overnight. But that wasn't the issue (although I am now going to replace them). After hours reading blogs I found out the ecu cuts out the compressor after 2mins of pumping and logs an error code. First time there is a 10 min delay (a couple of times) before the compressor will turn on again. Then it is 70 mins and then it goes up and up.
You need to clear the errors from the air sus ecu so it pumps up again. Do this by shorting out pins 4 & 13 of the car diagnostic tool plug (4th from left on top row, 5th on bottom row). Then turn ignition on and pump the brakes 8 times. Wait for the beeps to finish. Remove short circuiter. Now all codes are cleared and it will function normally
I thought the mechanics tool had done that

[Guest Close Guest]

A proper scan tool will reset it without shorting out pins. Yours has the text book symptoms of the leak and then shutting down longer and longer.