Mass Airflow Sensor
2013 Ford F-150 · 3.5L V6 EcoBoost
Sensor Type
thermistor
Waveform Type
dc-variable
Location
Mounted in intake air duct between air filter housing and throttle body, passenger side of engine
Pins
4-pin connector
Timebase
1s/div
Voltage Scale
1V/div
Trigger
N/A - DC signal
Wiring
Pin A: Gray/Yellow (MAF Signal), Pin B: Black (Ground), Pin C: Red/Black (12V Power), Pin D: Light Green/Black (Intake Air Temperature Signal)
Expected Voltage Range
At Idle
0.7V to 1.2V
At Higher RPM
3.5V to 4.8V
Expected Pattern
Smooth analog DC voltage signal that increases linearly with airflow, no pulsing or stepping
Known-Good Waveform
Hot-wire MAF sensor produces smooth DC voltage starting at 0.7-1.2V at idle (15-25 g/s airflow), increasing smoothly with throttle opening and turbo boost. At wide-open throttle with full boost, voltage should reach 3.5-4.8V representing 200-300+ g/s. Signal should respond immediately to throttle changes without lag or noise.
Common Failure Patterns
Voltage stuck at 0.5-0.8V regardless of throttle position, no response to airflow changes
Cause: Contaminated or failed hot-wire element, oil contamination from aftermarket intake or turbo seals, MAF circuit short
Diagnostic Tips
EcoBoost MAF sensors are very sensitive to contamination. Avoid oiled air filters. Check for boost leaks between turbochargers and throttle body. Compare MAF readings to calculated load and fuel trims for accuracy verification.
Related Diagnostic Trouble Codes
P0100P0101P0102P0103P0104
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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