As rdl mentioned in the other thread, it is only important to measure the vertical distance between the water levels. If you make sure the manometer is plumb, you make the measurement directly. If the manometer is not plumb, make sure you measure the difference in a vertically, not along the manometer.
As redl also pointed out, when you blow into the hose, it will open the diaphragm.
AFAIK, there will be no DTC because there is nothing in the system to monitor the CCV.
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Last edited by Steve530; 06-12-2012 at 03:15 PM.