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Home >> Lexus >> 1997 >> SC 300 Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Engine Controls - System/Component Tests) >> Acoustic Control Induction System (ACIS) >> ACIS System Check
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ACIS System Check

WARNING: This page is about a different car, the 1997 Lexus SC 400. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect vacuum gauge between IACV actuator and VSV. 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:
  3. System is okay if it operates as specified. If system does not operate as specified, perform ACIS CIRCUIT test.
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