Vacuum Switching Valve (VSV) Test

Unplug VSV connector. Connect battery to VSV terminals. See Fig 1. Apply air pressure to port "E". Air should escape from port "F". Disconnect battery terminals.
Apply air pressure to port "E". Air should not flow from port "F". Using ohmmeter, check for continuity between terminals and VSV body. Replace unit if incorrect airflow or continuity exists.
Using ohmmeter, measure resistance between both terminals of valve assembly. Resistance should be 38-44 ohms at 68°F (20°C). Replace valve if resistance is not within specification.

Fig 1: Testing VSV Operation

Fig 2: EGR System Components & Operating Parameters