(a) HC, CO

(1) Apply battery voltage to 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 15 to 40 kΩ.

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

(b) NOx

(1) Apply battery voltage to 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 2.5 to 40 kΩ.

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