1994 Lexus LS 400FACTORY OEM SERVICE PROCEDURE

ACIS Vacuum Tank

Disconnect vacuum hoses from vacuum tank. See Fig 2. Replace vacuum tank if it does not operate as follows.

  • Blow through port "B". See Fig 2. Air comes out of port "A".
  • Blow through port "A". Air does NOT come out of port "B".
  • Plug port "B". At port "A", apply 16 in. Hg. Vacuum holds for at least one minute.
Fig 1: Identifying Port On ACIS Vacuum Switching Valve (VSV)
G94D45263Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
Factory Service Tools

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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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