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Home >> Lexus >> 1997 >> SC 300 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Acoustic Control Induction System (ACIS) >> ACIS Intake Air Control System
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ACIS Intake Air Control System

  1. Install a 3-way vacuum "T" fitting in vacuum hose between IACV actuator and ACIS Vacuum Switch Valve (VSV). See Figure. Connect a vacuum gauge to vacuum "T" fitting. Start engine. With engine idling, ensure no vacuum reading is obtained.
  2. Fully open throttle and ensure vacuum reading momentarily reads at least 10 in. Hg and IACV actuator rod pulls downward. If IACV actuator rod pulls downward, no problem is indicated. If actuator valve rod fails to pull downward, go to next step.
  3. Remove air intake chamber (if necessary) to access intake air control valve. See Figure. Apply about 15 in. Hg to IACV actuator. If IACV actuator rod does not move, replace IACV actuator.
  4. If IACV actuator rod moves, check to see if diaphragm holds vacuum for at least one minute. If diaphragm does not hold vacuum, replace actuator. If diaphragm holds vacuum, ensure IACV plate is fully closed. If IACV plate is not fully closed, turn adjusting screw as necessary. If no problem is indicated, check ACIS vacuum tank. See ACIS VACUUM TANK .
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