Hyundai Santa Fe (2006 year). Manual — part 690
HA -138
HEATING, VENTILATION AND AIR CONDITIONING
Specification : Approx. 5V
1
12
15
17
19
20
21
22
2
3
4
5
6
7
8
9
10
11
3. Ambient temp. sensor signal
v
14 13
16
18
SCMHA6536L
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 a known-good A/C Control Unit and check for proper operation.
If the problem is corrected, replace A/C Control Unit and then go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
EC81091E
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 -139
DTC B1238 AMBIENT TEMPERATURE SENSOR OPEN (HIGH)
COMPONENT LOCATION
EDF1649A
Ambient Temp. Sensor
SCMHA6703L
GENERAL DESCRIPTION
E4951473
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
EBEAF741
The A/C controller sets DTC B1238 if there is an open circuit in ambient temp. sensor signal harness or the measured
resistance value of sensor is more than threshold value(about 527kΩ )
DTC DETECTING CONDITION
ECC7468F
Item
Detecting Condition
Possible cause
DTC Strategy
• Resistance check
Threshold value
• > 527kΩ
Detecting time
• 0.3 sec
FAIL SAFE
• Control with the value of 20 C(67 F)
• Open Circuit in harness
• Faulty ambient temp. Sensor
• Faulty A/C control unit
SPECIFICATION
E611C585
Refer to DTC B1237.
MONITOR SCANTOOL DATA
E1C87A66
1.
Connect scantool to Data Link Connector(DLC).
2.
Engine "ON"
3.
Monitor the "AMBIENT TEMP. SENSOR" Parameter on the Scantool.
HA -140
HEATING, VENTILATION AND AIR CONDITIONING
※
Parameter of "AMBIENT TEMP. SENSOR" will be fixed at 20℃(67℉), 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
B1238 AMBIENT TEMP. SNSR HIGH
Fig 1 : The current data in abnormal state.
Fig 2 : DTC B1238.
Fig. 1
Fig. 2
EQBF517A
4.
Are the DTC B1238 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
E7F0FB77
Refer to DTC B1237.
SIGNAL CIRCUIT INSPECTION
E124C6B6
1.
Check for open in harness.
1) Ignition "OFF"
2) Disconnect ambient temp. sensor.
3) Measure resistance between terminal "1" of ambient temp. sensor and terminal "3" of A/C Control Unit.
Specification : Approx. 0 Ω
BLOWER AND A/C CONTROLS (AUTOMATIC)
HA -141
Ω
*
*
*
*
1
12
15
17
19
20
21
22
2
3
4
5
6
7
8
9
10
11
1
2
1
2
1. Ambient temp. sensor signal(+)
2. Ambient temp. sensor ground
SCMHA6537L
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
EA9F4A89
1.
Check for open in ground harness.
1) Ignition "OFF"
2) Disconnect ambient temp. sensor.
3) Measure resistance between terminal "2" of ambient temp. sensor and chassis ground.
Specification : Approx. 0 Ω
1. Ambient temp. sensor signal(+)
2. Ambient temp. sensor ground
1
2
Ω
1
2
SCMHA6538L
4) Is the measured resistance within specifications?
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