Hyundai Santa Fe (2006 year). Manual — part 700
HA -178
HEATING, VENTILATION AND AIR CONDITIONING
Operating condition
Voltage
Note
Right after IGN "ON"
2.5V ± 0.3V
preheating(35 ± 2sec)
Normal
4.3V ± 0.3V
Intake door : Fresh
Gas detected
0.9V ± 0.3V
Intake door : Recirculation
Specifications : Voltage value of AQS sensor as a function of position of operating condition.
4) Is the measured voltage within specifications?
YES
Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
Substitute with AQS sensor and check for proper operation.
If the problem is corrected, replace AQS sensor and then go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
EF0A99CE
After a repair, it is essential to verify that the fault has been corrected.
1.
Connect scantool and select "Diagnostic Trouble Codes(DTCs)" mode and then clear DTC.
2.
Operate the vehicle and monitor the DTC on the scantool.
3.
Are any DTCs present?
YES
Go to the applicable troubleshooting procedure.
NO
System is performing to specification at this time.
BLOWER AND A/C CONTROLS (AUTOMATIC)
HA -179
DTC B1258 AQS SHORT
COMPONENT LOCATION
E1AE9C53
AQS Sensor is Located at Front Aide of Condensor
SCMHA6707L
GENERAL DESCRIPTION
E78FDD65
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 freshsh 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 A/C controller for closing intake door.
DTC DESCRIPTION
E65E21A7
The A/C controller sets DTC B1258 if there is a short circuit in AQS sensor signal harness or the measured voltage value
of the sensor is less than the threshold value.
DTC DETECTING CONDITION
E862F7F5
Item
Detecting Condition
Possible cause
DTC Strategy
• Voltage check
Threshold value
• < 0.1V
Detecting time
• 1 sec
FAIL SAFE
• AQS function OFF
• Intake door : return to previous state
• Short circuit in harness
• Faulty AQS Sensor
• Fault A/C Control Unit
SPECIFICATION
EBC31DE0
※
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 : Fresh
Gas detected
0.9V ± 0.3V
Intake door : Recirculation
HA -180
HEATING, VENTILATION AND AIR CONDITIONING
MONITOR SCANTOOL DATA
EB72B2D9
1.
Connect scantool to Data Link Connector(DLC).
2.
Engine "ON"
3.
Monitor the "AQS sensor" Parameter on the Scantool. While making hazardous gas such as tobacco fumes around
the AQS sensor.
1.2 CURRENT DATA
FIX
SCRN FULL
PART GRPH HELP
14.0 C
12.0 C
12.0 C
13.0 C
0.00 V
84.69 %
51.76 %
255
0.0 V
HEATER WATER TEMP. SNSR
IN-CAR TEMP. SENSOR
AMBIENT AIR TEMP. SNS
EVAPORATIVE SENSOR
DRIVER PHOTO SENSOR
AIR MIX POPENTIO. (DR.)
DIRECTION POTENIO. DR.
PASSENGER PHOTO SENSOR
AQS SENSOR
1.1 DIAGNOSTIC TROUBLE CODES
NUMBER OF DTC : 1 ITEMS
PART
ERAS
HELP
B1258 AQS SENSOR-SHORT(LOW)
Fig 1 : The current data in abnormal state.
Fig 2 : DTC B1258.
Fig. 1
Fig. 2
EQBF590A
4.
Are the DTC B1258 present and is parameter of "AQS SENSOR" fixed?
YES
Go to "Inspection" procedure.
NO
Fault is intermittent caused by poor contact in the sensor’s and/or A/C control unit’s connector or was repaired and
A/C control unit memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending,
corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of
Vehicle Repair" procedure.
TERMINAL AND CONNECTOR INSPECTION
EA2C2E51
1.
Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or
damage.
3.
Has a problem been found?
YES
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
BLOWER AND A/C CONTROLS (AUTOMATIC)
HA -181
NO
Go to "Signal circuit inspection" procedure.
SIGNAL CIRCUIT INSPECTION
E0460C72
1.
Check for open in harness.
1) Ignition "OFF"
2) Disconnect AQS sensor.
3) Measure resistance between terminal "1" of AQS sensor and terminal chassis ground.
Specification : Approx. 0 Ω
Ω
1
2
3
1
2
3
1. AQS signal input
2. AQS ground
3. AQS power
SCMHA6561L
4) Is the measured resistance within specifications?
YES
Go to "Component inspection" procedure.
NO
Check for open in harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
E2A85239
1.
Check AQS sensor.
1) Engine "ON"
2) Connect AQS sensor.
3) Measure voltage between terminal "1" and "2" of AQS sensor.
Specification : Refer the specifications.
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