Smog Ventilation Sensor: Inspection

INSPECT SMOG VENTILATION SENSOR
1. HC, CO:
  1. Apply battery voltage between terminals 3 (IG) and 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 decreases.
    
    HINT:
    
    The resistance before blowing exhaust gas is 10 to 40 kΩ.
    
    If the resistance is not as specified, replace the smog ventilation sensor.
    
    Fig 1: Applying Battery Voltage Between Terminals 3 (IG) And 6 (E)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. NOx:
  1. Apply battery voltage between terminals 3 (IG) and 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 to 40 kΩ.
    
    If the resistance is not as specified, replace the smog ventilation sensor.
    
    Fig 2: Applying Battery Voltage Between Terminals 3 (IG) And 6(E)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002