EGR Vacuum Switching Valve (VSV): Notes

NOTE: When testing EGR VSV, use proper illustration to determine component location. See Fig 1-29. The EGR VSV may be referred to as the VSV.

Disconnect electrical connector from EGR VSV. Using ohmmeter, check resistance between EGR VSV electrical terminals.
Replace EGR VSV if resistance is not within specification. See EGR VSV RESISTANCE SPECIFICATIONS table. Ensure no continuity exists between each electrical terminal and EGR VSV body. Replace EGR VSV if continuity exists between any electrical terminal and VSV body.
Apply air pressure to port "E" (without battery connected). See Fig 1. Air pressure should flow through the air filter. Connect battery voltage and ground to EGR VSV electrical terminals. See Fig 1. Apply air pressure to port "E". Air pressure should not flow through the air filter. Replace EGR VSV if defective.

EGR VSV RESISTANCE SPECIFICATIONS

Application	Ohms
Corolla	37-44

Fig 1: Testing EGR VSV Operation

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Fig 2: EGR System Diagram

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Fig 3: EGR System Components

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Fig 4: EGR System Operating Parameters

Fig 5: Fuel Evaporation System Components

Fig 6: Fuel Evaporation Operating Parameters

NOTE: The EVAP Thermal Vacuum Valve (TVV) may be referred to as EVAP Thermal Valve (TV).