Working on CTIS since it's not inflating. Pump working but sounds different than normal. Took Solenoids off and cleaned and soaked in line oil. Still not working. Through trial and error, my front tires are down to 8 psi ****. Maybe deflate valve stuck???? Not sure how to take off ANY Guidance is greatly appreciated

 

Took Solenoids apart and cleaned. Took compressor apart and metal rings were at the bottom. Could it just be the piston rings are worn out? Air coming out exhaust when I run the inflate but not filling tires. How do I test solenoids?

 

The H1 shop manual is probably a good starting point:

http://www.4x4us.net/documents/humme...tilisateur.pdf

 

My solution was to just take it out. I never off road so I got tired of the leaks. I removed the parts at the wheels and put a metal screw in valve in the wheels and now its just like a normal tire...no leaks.