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Intake Air Temperature Sensor

WARNING: This page is about a different car, the 2003 Saturn LW300 and 2003 Saturn L300. However, it is still accessible from the selected car via links, so may be relevant.
  1. A malfunction in the Intake Air Temperature (IAT) sensor circuit can set a DTC. For testing procedures and specifications, perform appropriate diagnostic test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 3.0L SATURN "L" SERIES article. An out-of-calibration IAT sensor may not set a DTC. Use the following procedure to test sensor calibration.
  2. Disconnect IAT sensor harness connector. See COMPONENT LOCATIONS  . Using DVOM, measure resistance between terminals of IAT sensor at specified temperatures. See Figure . Resistance should be high when air temperature is cold and drop as air temperature warms. With vehicle sitting overnight, ECT sensor and IAT sensor should have close to the same resistance reading. If resistance is not within specification, replace IAT sensor. See INTAKE AIR TEMPERATURE SENSOR under SENSORS & SWITCHES in REMOVAL & INSTALLATION - SATURN "L" SERIES article.
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