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
* AQS Sensing OPEN/SHORT : Sensing after IG ON.
* AQS Sensing FAIL (abnormal output) : Sensing after40sec IN ON.
* FAIL SAFE Function : AQS when AQS OPEN/SHORT and FAIL.

NOTE:
When IG is turned ON, AQS heats for 35±2 seconds, it will output below 2.5±0.3V 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.