Emission Control Valve Set (ES300)

WARNING: This page is about a different car, the 2002 Lexus RX 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.

Check VSV for EVAP with an ohmmeter connected between VSV terminals. See Fig 1. Resistance should be 27-33 ohms at 68°F (20°C). If resistance is to specification, go to next step. If resistance is not to specification, replace VSV.
Using ohmmeter, ensure there is no continuity between each terminal and VSV body. See Fig 2. If continuity is present, replace VSV. If continuity is not present, check that air does not flow between ports "E" to "F". See Fig 3. Apply battery voltage between VSV terminals. Air should flow between ports "E" to "F". See Fig 4.

Fig 1: Checking VSV For EVAP Resistance
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Checking Continuity Between VSV For EVAP Terminals & VSV Body
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Checking For No Airflow From Ports "E" To "F"
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Checking Airflow From Ports "E" To "F"
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002