Hyundai Santa Fe (2006 year). Manual — part 699
HA -174
HEATING, VENTILATION AND AIR CONDITIONING
DTC B1257 AQS OPEN
COMPONENT LOCATION
EF8D2F76
AQS Sensor is Located at Front Aide of Condensor
SCMHA6707L
GENERAL DESCRIPTION
ED4DF3B0
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
E12FB0BD
The A/C controller sets DTC B1257 if there is an open circuit in AQS sensor signal harness or the measured voltage value
of sensor is more than threshold value.
DTC DETECTING CONDITION
EB1B1045
Item
Detecting Condition
Possible cause
DTC Strategy
• Voltage check
Threshold value
• > 4.9V
Detecting time
• 1 sec
FAIL SAFE
• AQS function OFF
• Intake door : return to previous state
• Open Circuit in power
harness
• Open circuit in ground
harness
• Faulty AQS Sensor
• Poor connection of
connected part
SPECIFICATION
ECC6418A
Refer to DTC B1258.
MONITOR SCANTOOL DATA
EA426CBE
1.
Connect scantool to Data Link Connector(DLC).
2.
Engine "ON"
BLOWER AND A/C CONTROLS (AUTOMATIC)
HA -175
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
4.3 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
B1257 AQS SENSOR-OPEN(HIGH)
Fig 1 : The current data in abnormal state.
Fig 2 : DTC B1257.
Fig. 1
Fig. 2
EQBF590B
4.
Are the DTC B1257 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 controller’s connector or was repaired and
A/C controller 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
E078D7E2
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.
NO
Go to "Signal circuit inspection" procedure.
HA -176
HEATING, VENTILATION AND AIR CONDITIONING
SIGNAL CIRCUIT INSPECTION
EF29F40C
1.
Check for open in harness.
1) Ignition "OFF"
2) Disconnect AQS sensor.
3) Measure resistance between terminal "1" of AQS sensor and terminal "2" of A/C Control Unit.
Specification : Approx. 0 Ω
Ω
1
2
3
4
6
9
10
12
13
14
15
16
17
18
19
20
21
22
*
* *
*
1
2
3
1
2
3
1. AQS signal input
2. AQS ground
3. AQS power
SCMHA6558L
4) Is the measured resistance within specifications?
YES
Go to "Ground circuit Inspection " procedure.
NO
Check for open in harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
GROUND CIRCUIT INSPECTION
E60583A8
1.
Check for open in ground harness.
1) Ignition "OFF"
2) Disconnect AQS sensor.
3) Measure resistance between terminal "2" of AQS sensor and chassis ground.
Specification : Approx. 0 Ω
BLOWER AND A/C CONTROLS (AUTOMATIC)
HA -177
Ω
1
2
3
1
2
3
1. AQS signal input
2. AQS ground
3. AQS power
SCMHA6559L
4) Is the measured resistance within specifications?
YES
Go to "Component Inspection " procedure.
NO
Check for open in ground harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
E0F5764B
1.
Check AQS sensor.
1) Engine "ON"
2) Connect AQS sensor.
3) Measure voltage between terminal "1" and "2" of AQS sensor.
Specification : Refer to the specifications.
1
2
3
1
2
3
v
1. AQS signal input
2. AQS ground
3. AQS power
SCMHA6560L
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