Intake Air Temperature Sensor
2017 Hyundai Tucson · 2.5L I4
Sensor Type
thermistor
Waveform Type
dc-variable
Location
Integrated into the Mass Air Flow (MAF) sensor housing on the air intake duct between the air filter box and throttle body
Pins
2-pin connector
Timebase
5s/div for monitoring temperature changes
Voltage Scale
1V/div
Trigger
Not applicable for DC signal
Wiring
Light Blue/White wire (signal to ECM) and Black wire (sensor ground), shared with MAF sensor connector (5-pin total)
Expected Voltage Range
At Idle
1.5V to 3.5V
At Higher RPM
1.2V to 2.8V
Expected Pattern
Steady DC voltage that varies with intake air temperature, negative temperature coefficient thermistor showing 2.5-3.5V at cold ambient and 1.5-2.0V at heat-soaked conditions
Known-Good Waveform
At ambient temperature (68°F/20°C), expect 2.5-3.0V that closely tracks actual air temperature in the intake. After engine shutdown on a hot day, voltage may drop to 1.5-2.0V as underhood temperature rises (heat soak). The sensor should respond quickly to temperature changes, typically within 30-60 seconds.
Common Failure Patterns
Voltage reads constant 4.8-5.0V regardless of conditions
Cause: Open circuit in IAT sensor element or broken wire in MAF connector
IAT voltage significantly different from ECT at cold start (more than 1V difference)
Cause: Contaminated or failing sensor element, often from oil vapors or MAF cleaner damage
Related DTCs: P0110
Diagnostic Tips
Compare IAT reading to ECT at cold start - they should be within 10°F of each other. Hyundai Smartstream engines with high-mileage PCV issues often contaminate the IAT sensor with oil; inspect MAF/IAT element for contamination and avoid using MAF cleaner directly on IAT element as it can damage the thermistor coating.
Related Diagnostic Trouble Codes
P0110P0111P0112P0113P0114
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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