AQS(Air Quality System) keeps air inside in the most suitable state for driver. In polluted area AQS detects hazardous gas and intercepts inflow automatically, Inversely, In fresh area it allows the inflow of air to prevent the shortage of air and the accumulation of carbon dioxide. AQS sensor is located at front side of condensor and once hazardous gas is detected, it delivers the voltage signal to ECU for closing intake door.
The ECM sets DTC B1259 if preheating time of AQS sensor is over 40sec or signal from AQS sensor is not within specifications.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Voltage/time check | ● Poor connection of connected part ● Faulty AQS sensor |
Threshold value | ● Voltage : Preheating - 2.5V±0.3V normal - 4.3V±0.3V Gas detected - 0.9V±0.3V ● Preheating time < 40sec | |
Detecting time | - | |
FAIL SAFE | ● AQS function OFF ● Intake door : return to previous state |
※ Voltage value of AQS sensor as a function of position of operating condition.
Operating condition | Voltage | Note |
Right after IGN "ON" | 2.5V ± 0.3V | preheating(35 ± 2sec) |
normal | 4.3V ± 0.3V | Intake door : REC |
Gas detected | 0.9V ± 0.3V | Intake door : FRE |
