HCAC Vacuum Switching Valve
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Toyota Tacoma, 2002 Toyota RAV4, 2002 Toyota Prius, 2002 Toyota MR2, and 2002 Toyota Highlander. 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 HCAC Vacuum Switching Valve (VSV). See Figure. HCAC VSV is located on bracket bolted to timing chain end of engine and uses a Brown 2-pin electrical connector with Black and Black/White wires.
- Using ohmmeter, check that continuity exists between electrical terminals on HCAC VSV and that resistance is 33-39 ohms at 68°F (20°C). Replace HCAC VSV if no continuity exists or resistance is not within specification.
- Ensure no continuity exists between each electrical terminal and body of HCAC VSV body. Replace HCAC VSV if continuity exists between electrical terminal and body of HCAC VSV.
- To test HCAC VSV operation, apply air pressure to port "E". Ensure air flows from air filter and not from port "F". Perform STEP 1 in illustration. See Fig 1.
- Apply battery voltage and ground to electrical terminals on HCAC VSV. Apply air pressure to port "E". Ensure air flows from port "F" and not from air filter. Perform STEP 2 in illustration. See Fig 1. Replace HCAC VSV if defective.