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Home >> Lexus >> 2001 >> IS 300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Emission Systems & Sub-Systems >> Fuel Evaporation System >> EVAP Vacuum Switching Valve
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EVAP Vacuum Switching Valve

  1. Remove engine cover. Disconnect EVAP VSV connector. EVAP VSV is located near top of engine. See Figure-Figure . Disconnect vacuum hoses from VSV. Remove VSV. Measure resistance between VSV terminals. On GS300 and IS300, resistance should be 27-33 ohms at 68°F (20°C). On GS430 and LS430, resistance should be 30-34ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, 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" (port closest to electrical connector). Air should not flow from port "F" (port farthest away from electrical connector). 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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