Mass Airflow Sensor
2016 Ford F-150 · 5.0L V8 Coyote
Sensor Type
thermistor
Waveform Type
dc-variable
Location
Integrated into air intake tube between air filter housing and throttle body, passenger side of engine bay
Pins
4-pin connector
Timebase
1s/div
Voltage Scale
1V/div
Trigger
N/A - DC signal
Wiring
Gray/Red (MAF signal to PCM), Red/Black (12V power), Black (signal ground), Tan/Light Blue (IAT sensor signal integrated)
Expected Voltage Range
At Idle
0.6V to 1.2V
At Higher RPM
3.5V to 4.8V
Expected Pattern
Smooth analog DC voltage that increases linearly with airflow, no oscillations or steps
Known-Good Waveform
At idle (hot engine, Park), voltage should read 0.6-1.2V corresponding to 3-8 g/s airflow. Signal should be smooth and stable with no fluctuations greater than 0.05V. During snap throttle, voltage should rise smoothly to 3.5-4.8V without hesitation, dropout, or noise.
Common Failure Patterns
Signal frozen at one voltage or reading below 0.4V at idle
Cause: Contaminated hot wire element from oil vapors or dirt, or complete MAF sensor failure
Erratic voltage fluctuations or noise on signal line
Cause: Damaged MAF sensor wiring, poor ground connection, or electromagnetic interference from aftermarket accessories
Diagnostic Tips
Ford uses hot-wire MAF sensors susceptible to contamination from oiled aftermarket air filters. Verify no intake leaks between MAF and throttle body. Compare MAF voltage to calculated airflow in PCM data; idle should show 3-8 g/s on a healthy engine.
Related Diagnostic Trouble Codes
P0100P0101P0102P0103P0104
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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