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Home >> Lexus >> 1991 >> ES 250 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel Evaporation >> EVAP Vacuum Control Valve (LS400)
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EVAP Vacuum Control Valve (LS400)

  1. Mark vacuum control valve (VCV) vacuum lines for reassembly. Remove VCV from vehicle. VCV is located in-line between BVSV and EVAP canister. Using a vacuum pump, apply 2.76 in. Hg to top vacuum port of VCV. Blow into one of 2 lower vacuum ports. Air should pass freely between lower vacuum ports.
  2. Release vacuum from top vacuum port of VCV. Blow into one of 2 lower vacuum ports. Air should not pass between lower vacuum ports. If results are other than indicated, replace VCV.
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