A value from modeling that have been retrieved from an intake air temperature sensor has been currently been in use for outside temperature detection. However, it is difficult to use this value due to the properties of the turbo charger, because the temperature shows a great increase during the charging. Therefore, the outside temperature sensor is installed in front of the radiator to directly measure the outside temperature.
ECM sets DTC P0072 if the ECM detects ambient air temperature signal circuit is short to battery or open.
Item
Detecting Condition
Possible Cause
DTC Strategy
Electrical Check
Poor connection or damaged harness
short to battery in control harness
Open in ground circuit
Open in signal circuit
Faulty AAT
Enable Conditions
10V < Battery voltage < 16V
Time after start > 0 sec
Vehicle speed >0km/h
Threshold Value
Sensor voltage < 0.024V
Diagnostic Time
1sec
Mil On Condition
2 Driving Cycles
AAT Temp.(?)
Resistance(K?)
-40
55.61 ~ 66.21
-20
-4
18.76 ~ 21.37
0
32
7.62 ~ 7.95
20
68
3.18 ~ 3.37
25
77
2.63 ~ 2.77
40
104
1.50 ~ 1.62
60
140
0.76 ~ 0.84
80
176
0.40 ~ 0.45