Smog Ventilation Sensor: Inspection

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT SMOG VENTILATION SENSOR
1. HC, CO
  1. Connect a battery positive (+) lead to terminal 3 (IG) and a negative (-) lead to terminal 6 (E).
  2. Allow exhaust gas (HC, CO) to travel to the sensing portion of the smog ventilation sensor, and measure the resistance between terminals 1 (SG) and 2 (DGS).
    OK:
    
    When the sensor is exposed to the exhaust gas, the resistance increases.
    
    HINT.
    
    The resistance before blowing exhaust gas is 10 kΩ to 40 kΩ
    
    If the result is not as specified, replace the smog ventilation sensor
    
    Fig 1: Identifying Smog Ventilation Sensor
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. NOx
  1. Connect a battery positive (+) lead to terminal 3 (IG) and a negative (-) lead to terminal 6 (E).
  2. Allow exhaust gas (NOx) to travel to the sensing portion of the smog ventilation sensor, and measure the resistance between terminals 1 (SG) and 4 (DGS1)
    OK: When the sensor is exposed to the exhaust gas, the resistance increases.
    
    HINT:
    
    The resistance before blowing exhaust gas is 10 kΩ to 40 kΩ.
    
    If the result is not as specified, replace the smog ventilation sensor.
    
    Fig 2: Identifying Smog Ventilation Sensor (NOX)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002