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Home >> Pontiac >> 2002 >> Aztek FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 239 (Engine Controls - Theory & Operation - 2.2L) >> Computerized Engine Controls >> Input Devices >> Intake Air Temperature Sensor
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Intake Air Temperature Sensor

WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

The Intake Air Temperature (IAT) sensor is a variable resistor. The IAT sensor has a signal circuit and a low reference circuit. The IAT sensor measures the temperature of the air entering the engine. The Powertrain Control Module (PCM) supplies 5 volts to the IAT signal circuit and a ground for the IAT low reference circuit. When the IAT sensor is cold, the sensor resistance is high. When the air temperature increases, the sensor resistance decreases. With high sensor resistance, the PCM detects a high voltage on the IAT signal circuit. With lower sensor resistance, the PCM detects a lower voltage on the IAT signal circuit. If the PCM detects an excessively high or low IAT signal voltage, the PCM will set a DTC.

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