Intake Air Temperature Sensor
2013 Ford F-150 · 3.5L V6 EcoBoost
Sensor Type
thermistor
Waveform Type
dc-variable
Location
Integrated into the Mass Air Flow sensor housing at the air filter outlet, approximately 12 inches before the turbocharger inlet
Pins
2-pin connector
Timebase
5s/div for monitoring temperature changes
Voltage Scale
1V/div
Trigger
Free run
Wiring
Gray/Red (signal to PCM) and Gray (sensor ground, shared with MAF)
Expected Voltage Range
At Idle
1.2V to 3.8V
At Higher RPM
0.8V to 2.5V
Expected Pattern
NTC thermistor showing smooth voltage inversely proportional to intake air temperature. Ambient temperature (77°F) shows 2.3-2.7V, heat-soaked idle after highway driving shows 1.0-1.5V
Known-Good Waveform
At cold start matching ambient temperature, expect 2.3-2.7V at 77°F. During driving, voltage will decrease as underhood heat increases, typically 1.5-2.0V at idle after warm-up. Under boost conditions, intercooler effectiveness can momentarily increase voltage as cooled air enters. The signal should be smooth and stable with gradual changes corresponding to temperature.
Common Failure Patterns
Voltage pegged at 5.0V constantly
Cause: Open circuit in IAT sensor element or broken signal wire in MAF connector
Voltage near 0V or reading excessively high temperatures
Cause: Shorted IAT element or signal wire grounded, contamination on sensor element
Related DTCs: P0112
Diagnostic Tips
Since IAT is integrated into the MAF sensor assembly on this engine, any MAF contamination or connector issues affect both sensors. A known-good IAT should match ambient temperature at cold start; compare voltage to ambient air thermometer reading. Typical resistance is 25-30kΩ at 77°F.
Related Diagnostic Trouble Codes
P0110P0111P0112P0113P0114
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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