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

  1. Connect vacuum gauge between IACV actuator and VSV. See Fig 1. 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 CIRCUIT  test.
Fig 1: Locating ACIS Components
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