Double Vacuum Valve (DVV)

Check vacuum circuit continuity by blowing air.
1. OFF state: All circuit should be closed.
2. Apply 12 volts to the positive (+) terminal and ground terminal T1. There should be continuity between B and C at this time.
3. Apply 12 volts to the positive (+) terminal and ground terminal T2. There should be continuity between A and B at this time.

If a problem is found, replace the D.V.V.