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Pressure Switching Valve Vacuum Switching Valve

  1. Remove pressure switching valve Vacuum Switching Valve (VSV). VSV has 2 vacuum ports, a Blue 2-pin connector and is mounted on top of EVAP canister. See Figure or Figure . Measure resistance between pressure switching valve VSV terminals. If resistance is 37-44 ohms at 68°F (20°C), go to next step. If resistance is not 37-44 ohms, replace VSV.
  2. Check for continuity between pressure switching valve 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 pressure switching valve VSV.
  3. Apply air pressure to VSV port "E". See Fig 1. If air does not flow from port "F", go to next step. If air flows from port "F", replace VSV.
  4. Using jumper wires, apply battery voltage and ground 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 from port "F", replace VSV.
Fig 1: Identifying Pressure Switching Valve VSV Ports
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