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Home >> Lexus >> 1994 >> SC 300 Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Acoustic Control Induction System (ACIS) >> ACIS System Operation
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ACIS System Operation

  1. Connect vacuum gauge between IACV actuator and VSV. See Figure. See COMPONENT LOCATIONS  under INTRODUCTION. Start engine. With engine idling, gauge needle should indicate no vacuum.
  2. While snapping throttle fully open and releasing it, IACV actuator rod should move, and gauge needle should quickly fluctuate to the following specification:
    • About 10 in. Hg or more.
  3. System is okay if it operates as specified. If system does not operate as specified, perform ACIS CIRCUITS test.
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