Climate Control Exhaust Gas Sensor: Testing and Inspection

HEATING / AIR CONDITIONING: SMOG VENTILATION SENSOR: INSPECTION

1. INSPECT SMOG VENTILATION SENSOR

(a) 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 kOhms to 40 kOhms.

(2) If the result is not as specified, replace the smog ventilation sensor.

Text in Illustration





(b) 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 kOhms to 40 kOhms.

(2) If the result is not as specified, replace the smog ventilation sensor.

Text in Illustration