Intake Air Temperature Sensor

Intake Air Temperature (IAT) sensor is mounted in near throttle body. See Fig 1 -Fig 5 . The IAT sensor is a 2-wire Negative Thermal Coefficient (NTC) sensor. As intake air temperature increases, voltage decreases. As intake air temperature decreases, voltage increases. The IAT sensor provides an input voltage to the PCM indicating intake air density based on temperature. The IAT sensor input is used by the PCM to calculate fuel injector pulse width and ignition timing spark advance. The resistance values are the same as the Engine Coolant Temperature (ECT) sensor.

Fig 1: Locating IAT Sensor (Liberty - 2.4L)

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Fig 2: Locating IAT Sensor (Liberty - 3.7L)

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Fig 3: Locating IAT, MAP & TP Sensors, & IAC Motor (Grand Cherokee - 4.0L & Wrangler - 4.0L)

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Fig 4: Locating IAT & TP Sensors, & IAC Motor (Grand Cherokee - 4.7L)

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Fig 5: Locating IAT, MAP & TP Sensors, & IAC Motor (Wrangler - 2.5L)

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