Apply battery voltage between terminals 3 (IG) and 6 (E).

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 resistance is not as specified, replace the smog ventilation sensor.

Apply battery voltage between terminals 3 (IG) and 6 (E).

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 resistance is not as specified, replace the smog ventilation sensor.