Smog Ventilation Sensor: Inspection

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT COOLER SENSOR (SMOG VENTILATION THERMISTOR)

Connect the positive (+) lead from the battery to the terminal 4 (IG) and the negative (-) lead to terminal 1 (GND).
Apply battery positive voltage between terminals 1 and 4 for more than 30 seconds.

Measure the resistance of the cooler.

Fig 1: Identifying Smog Ventilation Sensor Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
2 (S.G) - 3 (GAS)	10 to 35°C (50 to 95°F)	5 to 100 kΩ

IF the result is not as specified, replace the cooler.

HINT:

When the cooler is exposed to the exhaust gas, the resistance goes down.