Climate Control Exhaust Gas Sensor: Service and Repair

Inspection

1. Ignition "ON".
2. Using the scan tool.
3. Check the output voltage of AQS between terminals 2 and 3.
Specification









4. AQS diagnosis and fail safe
Detect the open of signal for 7 seconds without choosing the AQS switch when IG on.
If 2.5V or more is detected for 3.5 seconds or more among 7 seconds, be judged the open of AQS signal.
Operate as below fail safe function, while choosing AQS.
Fail safe: Release the AQS (AQS cannot be selected), Fresh/recirculation maintains previous situation of AQS selection.

NOTE:
When IG is turned ON, AQS heats for 35 ± 2.5 seconds, it will output 2.5 ± 0.55V voltage during this time.

Replacement

1. Disconnect the negative (-) battery terminal.
2. Remove the front bumper.

3. Remove the AQS (B) after loosening the mounting bolts.




4. Installation is the reverse order of removal.