Checking 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 POWERTRAIN VERIFICATION TEST VER-2 under VERIFICATION TESTS to ensure system is functioning properly.

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

Fig 1: Locating IAT, MAP & TP Sensors, & IAC Motor (Cherokee & Wrangler 4.0L)

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Fig 2: Locating IAT, MAP & TP Sensors, & IAC Motor (Grand Cherokee - 4.0L)

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

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Fig 4: Locating IAT, MAP, & TP Sensors, & IAC Motor (Wrangler 2.5L)

Courtesy of DAIMLERCHRYSLER CORPORATION