EGR Vacuum Switching Valve (VSV)
NOTE:
When testing EGR VSV, use proper illustration to determine component location. See Figure.
- Disconnect electrical connector from EGR VSV. Using ohmmeter, check that continuity exists between electrical terminals on EGR VSV and that resistance is within specification. See EGR VSV RESISTANCE SPECIFICATIONS table. Replace EGR VSV if no continuity exists or resistance is not within specification.
- Ensure no continuity exists between each electrical terminal and the body of EGR VSV body. Replace EGR VSV if continuity exists between electrical terminal and the body of EGR VSV.
- Apply air pressure to port "E" without battery connected. See Fig 1. Air pressure should flow through the air filter. Apply battery voltage and ground to electrical terminals on EGR VSV. See Fig 1. Apply air pressure to port "E". Air pressure should now flow from port "F". Replace EGR VSV if defective.
EGR VSV RESISTANCE SPECIFICATIONS
| Application | Ohms @ 68°F (20°C) |
|---|---|
| Corolla | 37-44 |