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Home >> Lexus >> 1999 >> SC 400 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Emission Systems & Sub-Systems >> Fuel Evaporation System (LS400) >> EVAP Vacuum Switching Valve

EVAP Vacuum Switching Valve

  1. Remove engine cover. Remove EVAP VSV. See Figure. Disconnect electrical connector and vacuum hoses from VSV. Measure resistance between VSV terminals. If resistance is 30-34 ohms at 68°F (20°C), go to next step. If resistance is not 30-34 ohms, replace VSV.
  2. Check for continuity between VSV case and each terminal of VSV connector (this checks for an internal short). If continuity does not exist, go to next step. If continuity exists, replace VSV.
  3. Apply compressed air to port "E". See Figure. Air should not flow from port "F". If VSV function as specified, go to next step. If VSV does not function as specified, replace VSV.
  4. Apply battery voltage across VSV terminals. Apply compressed air to port "E". If air flows out of port "F", VSV is functioning properly. If air does not flow out of port "F", replace VSV.
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