Intake Air Temperature Sensor

NOTE: When performing this test, DO NOT allow more than 5 minutes between measuring temperature of Intake Air Temperature (IAT) sensor with scan tool and measuring the air temperature inside of intake manifold with temperature probe.

NOTE: For circuit identification and wiring diagram, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform TEST VER-2: POWERTRAIN VERIFICATION under VERIFICATION TESTS to ensure system is functioning properly.

Turn ignition on. Using scan tool, read and record IAT sensor value. Remove IAT sensor. Fig 1-Fig 3 . Using a thermometer, read temperature inside IAT sensor opening. If IAT sensor value is within 10°F of thermometer reading, reinstall IAT sensor. IAT sensor is operating properly. Test is complete. If IAT sensor value is not within 10°F of thermometer reading, replace IAT sensor.

Fig 1: Locating IAT, MAP, & TP Sensors, & IAC Motor (2.5L)

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Fig 2: Locating IAT, MAP & TP Sensors, & IAC Motor (3.9L & 5.9L)

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Fig 3: Locating IAT & TP Sensors, & IAC Motor (4.7L)

Courtesy of DAIMLERCHRYSLER CORPORATION