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Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Engine Controls - System & Component Testing) >> Air Induction Systems >> Acoustic Control Induction System (ACIS) - GS430 & LS430 >> ACIS Vacuum Switching Valve
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ACIS Vacuum Switching Valve

WARNING: This page is about a different car, the 2002 Lexus SC 430, 2002 Lexus LS 430, 2002 Lexus IS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove engine cover. Remove air cleaner inlet tube. Remove throttle body. See THROTTLE BODY under FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article. Remove intake manifold assembly. See KNOCK SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION 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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