Climate Control Exhaust Gas Sensor: Testing and Inspection

AIR CONDITIONING: SMOG VENTILATION SENSOR: INSPECTION

INSPECTION

1. INSPECT SMOG VENTILATION SENSOR






(a) 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 kOhms.

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






(b) 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 kOhms.

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