Circuit Description
Intake Air Temperature (IAT) sensor is a thermistor located in the air intake passage of the air induction system. When sensor is cold, resistance is high and decreases as sensor temperature increases. PCM supplies a 5-volt signal to the sensor which is also connected to ground. PCM reads voltage drop on the sensor signal line to determine air temperature.
DTC P0113 will set if IAT reading is less than -22°F (-30°C) when engine run time is greater than 10 seconds, no VSS DTCs are present, air flow is less than 16 gm/second, and vehicle speed is less than 15 MPH. All conditions must be met for about 6 seconds.
NOTE:
A short to battery voltage on IAT sensor signal circuit will damage IAT sensor. If circuit is found to be shorted, test sensor for proper resistance. See appropriate SENSOR OPERATING RANGE CHARTS article.