I am working on air ride system on my Yukon. the computer trouble code says the air exhaust solenoid is bad. I bench tested it and it works fine. I think the problem is the resistance. the resistance is suppost to be between 18 and 45 ohms. it reads right on 18. I think the computer is reading that as bad. what can I do to increase the resistance on this solenoid circuit?? Any input will be appreciated.