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Vacuum Switching Valve

  1. Check vacuum circuit continuity in VSV (located on left strut tower) by blowing air into pipe. Connect VSV terminals to battery terminals. See Fig 1.
    Fig 1: Checking Vacuum Circuit Continuity
    G5000
  2. Blow into pipe and check that VSV is open. Disconnect positive battery terminal. Blow into pipe and check that VSV is closed. If necessary, replace VSV.
  3. Check for short circuit. Using an ohmmeter, check that there is no continuity between positive terminal and VSV body. If necessary, replace VSV.
  4. Check for open circuit. Using an ohmmeter, measure resistance between positive terminal and other terminal. Ensure that resistance is 38-44 ohms at 68°F (20°C). If not within specification, replace VSV.
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