Intake Air Temperature Sensor
2019 Ford F-150 · 5.0L V8 Coyote
Sensor Type
thermistor
Waveform Type
dc-variable
Location
Integrated into Mass Air Flow (MAF) sensor housing on air intake tube between air filter and throttle body
Pins
2-pin connector
Timebase
1s/div
Voltage Scale
1V/div
Trigger
Not applicable for DC measurement
Wiring
Tan/Orange wire (signal) and Gray/White wire (5V reference), shares ground through MAF connector
Expected Voltage Range
At Idle
1.5V to 3.5V
At Higher RPM
1.2V to 2.8V
Expected Pattern
Stable DC voltage inversely proportional to intake air temperature, may slightly decrease under heavy acceleration due to air heating
Known-Good Waveform
At ambient temperature (68°F), expect 2.5-3.0V. Voltage decreases as intake air warms from engine heat or turbo operation. Should match ECT sensor voltage at cold start since both sensors measure ambient temperature. Voltage should be stable with minimal noise (less than 0.05V ripple).
Common Failure Patterns
Reading stuck at -40°F (4.8-5.0V) or very high voltage
Cause: Open circuit in IAT portion of MAF sensor, broken thermistor element
Voltage near 0V or reading extremely high temperature
Cause: Short to ground in MAF connector or IAT circuit
Related DTCs: P0112
Diagnostic Tips
Since IAT is integrated into the MAF sensor on this vehicle, contamination or MAF failure often affects both sensors. Always check that IAT and ECT match at cold start - more than 15°F difference indicates a problem. Clean MAF sensor with proper MAF cleaner, not carburetor cleaner which can damage the hot-wire element.
Related Diagnostic Trouble Codes
P0110P0111P0112P0113P0114
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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