AIR38 - Check Pair Valve Operation For Open

^ Key OFF.

^ Reconnect hoses to check valves.

^ Remove air hose at control valve inlet.

^ Key ON, engine RUNNING (idle) at normal operating temperature.

^ Is air being drawn into the valve?

YES -- Go to AIR39. AIR39 - Check Pair Valve Operation For Closed

NO -- Go to AIR4O. AIR40 - Check For Vacuum at Pair Valve