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Home >> Saturn >> 1998 >> SL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0113 - IAT Sensor Circuit Temperature Out Of Range - High >> Circuit Description

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 will set if IAT reading is greater than -257°F (125°C) when engine run time is greater than 10 seconds, no ECT or VSS DTC is present, and air flow at less than 16 gm/second and if these conditions are 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 IAT TEMPERATURE-TO-RESISTANCE VALUES  table.
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