Hyundai Santa Fe (2006 year). Manual — part 689
HA -134
HEATING, VENTILATION AND AIR CONDITIONING
DTC B1237 AMBIENT TEMPERATURE SENSOR SHORT (LOW)
COMPONENT LOCATION
ED485BBE
Ambient Temp. Sensor
SCMHA6703L
GENERAL DESCRIPTION
E2ABCF83
The ambient temperature senor located at the center stay of the condenser, detects ambient air temperature. It is a nega-
tive type thermistor whose resistance is inversely proportional to temperature. Its output is used for discharge temperature
sensor, sensor fail-safe, temperature regulation door lock, blower motor level control, mix mode control and in-car humidity
control.
DTC DESCRIPTION
EF007347
The A/C controller sets DTC B1237 if there is a short circuit in ambient temp. sensor signal harness or the measured
resistance value of sensor is less than threshold value(about 7.48kΩ )
DTC DETECTING CONDITION
E76C2039
Item
Detecting Condition
Possible cause
DTC Strategy
• Resistance check
Threshold value
• < 7.48kΩ
Detecting time
• 0.3 sec
FAIL SAFE
• Control with the value of 20 C(68 F)
• Short circuit in harness
• Faulty ambient temp. Sensor
• Faulty A/C control unit
SPECIFICATION
EA51C1AC
Temperature[ C( F)]
Resistance(kΩ )
Temperature[ C( F)]
Resistance(kΩ )
-30(-22)
527.99
25(77)
30
-15(5)
218.21
35(95)
19.6
0(32)
97.83
50(122)
10.82
15(59)
47.12
60(140)
7.48
BLOWER AND A/C CONTROLS (AUTOMATIC)
HA -135
MONITOR SCANTOOL DATA
E30FCFE7
1.
Connect scantool to data link connector(DLC).
2.
Engine "ON"
3.
Monitor the "AMBIENT TEMP. SENSOR" Parameter on the Scantool.
※
Parameter of "AMBIENT TEMP. SENSOR" will be fixed at 20 C, if there is any fault in AMBIENT TEMP. SENSOR.
1.2 CURRENT DATA
FIX
SCRN FULL
PART GRPH HELP
17.0 C
12.0 C
20.0 C
13.0 C
0.00 V
91.75 %
90.18 %
255
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
1.1 DIAGNOSTIC TROUBLE CODES
NUMBER OF DTC : 1 ITEMS
PART
ERAS
HELP
B1237 AMBIENT TEMP. SNSR LOW
Fig 1 : The current data in abnormal state.
Fig 2 : DTC B1237.
Fig. 1
Fig. 2
EQBF516B
4.
Are the DTC B1237 present and is parameter of "AMBIENT TEMP. 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
E20274CA
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.
HA -136
HEATING, VENTILATION AND AIR CONDITIONING
NO
Go to "Signal circuit inspection" procedure.
SIGNAL CIRCUIT INSPECTION
EC50D358
1.
Check for short to ground in harness.
1) Ignition "OFF"
2) Disconnect ambient temp. sensor.
3) Measure resistance between terminal "1" of ambient temp. sensor and chassis ground.
Specification : Approx. ∞Ω
Ω
1
2
1
2
1. Ambient temp. sensor signal(+)
2. Ambient temp. sensor ground
SCMHA6534L
4) Is the measured resistance within specifications?
YES
Go to "Component Inspection" procedure.
NO
Check for short to ground in harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
E3B39A1B
1.
Check Ambient temp. sensor.
1) Ignition "OFF"
2) Disconnect ambient temp. sensor.
3) Measure resistance between terminal "1" and "2" of ambient temp. sensor.
Specification : Refer the specifications in fig 3.
BLOWER AND A/C CONTROLS (AUTOMATIC)
HA -137
1
2
1
2
Ω
1. Ambient temp. sensor signal
2. Ambient temp. sensor ground
SCMHA6535L
218.21
97.83
47.12
30
19.6
10.82
7.48
527.99
0
100
200
300
400
500
600
-30
-15
0
15
25
35
50
60
Resistance
(k
Ω)
T emper atur e( c)
Fig 3) Specifications : Resistance value of ambient temp. sensor as a function of temperature.
Fig. 3
EQBF516F
4) Is the measured resistance within specifications in fig3? (tolerance limits ±3%)
YES
Go to "Check A/C Control Unit" procedure.
NO
Substitute with a known-good ambient temp. sensor and check for proper operation.
If the problem is corrected, replace ambient temp. sensor and then go to "Verification of Vehicle Repair" proce-
dure.
2.
Check A/C Control Unit
1) Engine "ON"
2) Disconnect ambient temp. sensor.
3) Measure voltage between terminal "3" of A/C Control Unit and chassis ground.
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