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ACIS Vacuum Switching Valve

  1. Remove engine cover. Remove air cleaner inlet tube. Remove throttle body. See THROTTLE BODY under FUEL SYSTEM in REMOVAL & INSTALLATION - EXCEPT GX470 article. Remove intake manifold assembly. See KNOCK SENSOR under SENSORS & SWITCHES in REMOVAL & INSTALLATION - EXCEPT GX470 article. Disconnect vacuum hoses and electrical connector from Vacuum Switching Valve (VSV). See Figure. Remove VSV. Measure resistance between VSV terminals. If resistance is 33-39 ohms, go to next step. If resistance is not 33-39 ohms, replace VSV.
  2. Check for continuity between VSV case and each terminal at VSV connector (this checks for an internal short). If continuity does not exist, go to next step. If continuity exists, replace VSV.
  3. Apply air through VSV port "E". See Figure. Air should flow out of filter, but not out of port "F". Apply 9-14 volts and ground to VSV terminals. Apply compressed air to port "E". Air should flow out of port "F", but not out of filter. If ACIS VSV does not function as specified, replace ACIS VSV.
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