1997 Lexus SC 300 AutomaticFACTORY OEM SERVICE PROCEDURE

ACIS Vacuum Tank

Disconnect vacuum hoses from vacuum tank. Vacuum tank is located on bottom of air intake chamber. See Figure. Replace vacuum tank if it does not operate as follows.

  • Blow air through port "A". See Fig 1. Air should flow out of port "B".
  • Blow air through port "B". Air should not flow out of port "A".
  • Plug port "B". Apply 16 in. Hg to port "A". Vacuum should hold for at least one minute.
Fig 1: Identifying ACIS Vacuum Tank Ports
G97H06171Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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