Purge Flow Switching Valve Vacuum Switching Valve (Prius)
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2003 Toyota Tacoma, 2003 Toyota RAV4, 2003 Toyota Prius, 2003 Toyota Matrix, and 2003 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Read service precautions before proceeding with service procedure. See SERVICE PRECAUTIONS .
- Remove purge flow switching valve Vacuum Switching Valve (VSV). Purge flow switching valve VSV is located on bracket at charcoal canister on top of fuel tank and contains Blue 2-pin electrical connector with Black and Black/Red wires. See Figure. If necessary to remove fuel tank for access to purge flow switching valve VSV, see FUEL PUMP under FUEL SYSTEMS in REMOVAL & INSTALLATION - 4-CYLINDER article for removal of fuel tank.
- Using ohmmeter, ensure continuity exists between electrical terminals on purge flow switching valve VSV and that resistance is 33-39 ohms at 68°F (20°C). Replace purge flow switching valve VSV if no continuity exists or resistance is not within specification.
- Ensure no continuity exists between each electrical terminal and body of purge flow switching valve VSV. Replace purge flow switching valve VSV if continuity exists between electrical terminal and body of purge flow switching valve VSV.
- To test purge flow switching valve VSV operation, apply air pressure to port "E". Ensure air flows from port "F" and not from port "G". Perform STEP 1 in illustration. See Fig 1.
- Apply battery voltage and ground to electrical terminals on purge flow switching valve VSV. Apply air pressure to port "G". Ensure air flows from port "F" and not from port "E". Perform STEP 2 in illustration. See Fig 1. Replace purge flow switching valve VSV if defective.