Vacuum Switching Valve (VSV)
- Connect battery voltage to VSV terminals. See Fig 1. Blow air into port "E" (nearest valve) and check that air comes out port "F" (farthest from valve). Disconnect battery and repeat test. Air should come out front port ("G").
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- Using an ohmmeter, check that there is no continuity between positive terminal and body of VSV. Resistance between terminals should measure 38-43 ohms at 68°F (20°C). Replace valve if it does not meet specifications.