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Hyundai Equus: Air Quality Sensor (AQS) Repair procedures - Air Conditioning System - Heating, Ventilation and Air Conditioning - Hyundai Equus VI 2009-2020 Service ManualHyundai Equus: Air Quality Sensor (AQS) Repair procedures

Inspection
1.
Turn the ignition switch OFF.
2.
Connect the GDS.
3.
Check the output voltage of AQS between terminal 2 and 3.

1. DC 12V( Ignition)
2. Sensor ground
3. AQS signal

Specification
Condtion
Output Signal (V)
Intake Control State
Intake Feedback (V)
Preheating
2.5 ± 0.55
maintain previous state
maintain previous state
Below standard inflow of polluted air
4.3 ± 0.55
Fresh air
0.3
Above standard inflow of polluted air
0.9 ± 0.55
Recirculated air
4.7

4.
AQS diagnosis and fail safe
A.
With the ignition switch turned ON, it does not judge whether it has failed or not while the AQS sensor is preheating (35 ± 2 sec.). It is judged after 40 seconds the ignition switch has been turned ON.
B.
At this time, if the AQS output is out of normal range, the AQS is turned off.
C.
But, if the AQS is OPEN/SHORT, the AQS will turn off right after the ignition switch is turned ON regarding it as a malfunction.
Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the front bumper.
(Refer to Body - "Front Bumper Cover")
3.
Disconnect the smart cruise control unit connector (A).
4.
Loosen the bolts and then remove the smart cruise control unit bracket (B).

5.
Disconnect the connector (A) and then remove the AQS (B).
[Smart Cruise Control system]

[Non-Smart Cruise Control system]

6.
Install in the reverse order of removal.
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