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Home >> Lexus >> 1996 >> SC 300 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Acoustic Control Induction System (ACIS) >> ACIS Intake Air Control Valve (IACV)
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ACIS Intake Air Control Valve (IACV)

  1. Remove air intake chamber for access to intake air control valve (leave intake air connector and throttle body installed). See Figure. Apply about 15 in. Hg to IACV actuator. If IACV actuator rod does not move, replace IACV actuator.
  2. 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.
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