ACIS Vacuum Switching Valve
WARNING: This page is about a different car, the 2003 Lexus SC 430, 2003 Lexus LS 430, 2003 Lexus IS 300, 2003 Lexus GS 430, and 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
- Remove bolt and A/T fluid dipstick and guide. Remove and discard "O" ring. Remove emission control valve set from top of vacuum tank. Disconnect vacuum hoses and electrical connector from ACIS Vacuum Switching Valve (VSV). See Figure.
- Measure resistance between VSV terminals. If resistance is not 39-45 ohms at 68°F (20°C), replace ACIS VSV. If resistance is 39-45 ohms, check for continuity between VSV case and each terminal at VSV connector (this checks for an internal short). If continuity does not exist, go to next step. If continuity exists, replace VSV.
- Apply compressed air to port "E". See Fig 1. Air should flow out of filter, but not out of port "F". Using jumper wires, apply 9-14 volts and ground to VSV terminals. Apply compressed air to port "E". Air should flow out of port "F", but not out of filter. If ACIS VSV does not function as specified, replace ACIS VSV.