Component Location
General Description
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.
DTC Description
ECM sets DTC P0073 if the ECM detects ambient air temperature signal circuit is short to battery or open.
DTC Detecting Condition
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
|
Specification
Temperature(?/?) | Resistance(K?) | Temperature(?/?) | Resistance(K?) |
-20/-4 | 284.5 | 10/50 | 59.6 |
-10/14 | 164.2 | 30/86 | 24.18 |
0/32 | 97.5 | 50/122 | 10.8 |
Diagnostic Circuit Diagram
Signal Waveform & Data
Connect GDS with diagnostic connector.
Warm up the engine to normal engine temperature afte engine starts.
Select and monitor "Ambient Air Temperature sensor" parameter.
Fig.1) Parameter of "Ambinent Sensor" will be fixed at 20?(68?), if there is any fault in Ambient Sensor.
Is the ambient sensor abnormal ?
![]() | ? Go to "Inspection and Repair" procedure. |
![]() | ? This is a intermittent problem caused by poor contact of component or Control Unit ? Thoroughly check the looseness, poor connection, bent, corrison, contamination, deformation or damage of connector. ? Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure. |