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Home >> GMC >> 1999 >> Forward Control 6.5 F, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - DTC P0100-P0134 >> DTC P0112 >> DTC P0112: IAT Sensor Circuit-High Temperature (1.9L SATURN) >> 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. Resistance decreases as sensor temperature increases. PCM supplies and monitors a 5-volt signal circuit 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 less than -22°F (-30°C) when engine run time is greater than 10 seconds, vehicle speed less than 15 MPH, airflow is less than 16 gm/s and no VSS DTC is present and if 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 appropriate SENSOR OPERATING RANGE CHARTS article.
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