Vacuum Switching Valve (VSV)

1. Connect VSV terminals to a 12-volt power source. See Fig 1. Blow air into pipe A and check that air comes out of pipe B. Disconnect power source and blow air into pipe A and check that air comes out of filter.
2. Using a volt/ohmmeter, check that there is no continuity between terminals and body of VSV.
3. Using a volt/ohmmeter, measure resistance between terminals. Resistance should be 36-42 ohms at 68°F (20°C). If resistance is not within specification, replace VSV. See Fig 2.

Fig 1: Testing VSV Valve

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Fig 2: Checking VSV Resistance

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