Air Vacuum Switching Valve

AIR Vacuum Switching Valve Testing:

1. Apply battery voltage to vacuum switching valve.

2. Ensure that air does not flow freely through ports "X" and "Y".

3. Ensure that air flows freely through ports "Y" and "Z".

4. Remove voltage. Ensure air flows freely through ports "X" and "Y".

5. Ensure air does not flow freely through ports "Y" and "Z".

6. If switch does not operate as described, replace vacuum switching valve.