Mass Airflow Sensor
2011 Ford F-150 · 5.0L V8 Coyote
Sensor Type
thermistor
Waveform Type
dc-variable
Location
Mounted in air intake tube between air filter box 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/Light Blue or Pink (12V power), Black or Black/White (sensor ground), Light Green/White or Tan/Light Blue (intake air temperature signal)
Expected Voltage Range
At Idle
0.7V to 1.2V
At Higher RPM
2.5V to 4.5V
Expected Pattern
Smooth DC voltage that increases proportionally with airflow, clean voltage with minimal noise or ripple
Known-Good Waveform
At idle (approximately 800 RPM), MAF voltage should read 0.7-1.2V representing 4-8 g/s airflow. Signal should be smooth and stable with less than 0.05V ripple. During throttle snap from idle to 3000 RPM, voltage should rise smoothly and quickly to 2.5-3.5V, then settle back down proportionally. No sudden spikes, dropouts, or erratic behavior.
Common Failure Patterns
Voltage reads 0.3-0.5V at idle or does not increase smoothly with RPM
Cause: Contaminated MAF sensor element (oil from over-oiled aftermarket air filters is very common), failed sensor element
Voltage reading too high at idle (above 1.5V) or shows excessive ripple/noise
Cause: Vacuum leak downstream of MAF (very common on intake manifold gaskets), cracked air intake tube allowing unmetered air
Diagnostic Tips
Ford uses hot-wire MAF sensors that are very sensitive to contamination. Never touch the sensor element. Verify no air leaks between MAF and throttle body. Compare MAF voltage to calculated airflow in scan tool (should correlate). K&N or similar oiled filters are a leading cause of MAF failure on this engine.
Related Diagnostic Trouble Codes
P0100P0101P0102P0103P0104
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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