Vacuum Switching Valves (VSV)
- Disconnect electrical connector and hoses from No. 1 VSV and remove VSV. Apply battery voltage between terminals of connector. See Fig 1. Blow into top port. Air should escape from rear port.
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- Disconnect battery voltage and again blow into top port. Air should escape from air filter in front part of No. 1 VSV and not escape from No. 2 VSV. Replace valve if defective.
- Using an ohmmeter, check that continuity does not exist between positive terminal of VSV connector and valve body. If continuity is present, replace valve.
- Using an ohmmeter, measure resistance between terminals of connector. Resistance should be 38-43 ohms at 68°F (20°C). If resistance is not within specified range, replace valve.