Mass Airflow Sensor
WARNING: This page is about a different variant/trim than selected.
Mass Airflow (MAF) Sensor is located between Air Cleaner and Throttle Body or inside Air Cleaner Assembly.- MAF sensors use a hot wire sensing element to measure amount of air entering the engine.
- Air passing over the hot wire causes it to cool.
- The hot wire is maintained at 392°F (200°C) greater than ambient temperature, as measured by a constant cold wire. See Fig 1.
- The current required to maintain hot wire operating temperature is proportional to the intake air mass flow.
- MAF sensor outputs an analog voltage signal to PCM proportional to intake air mass.
- PCM uses this signal to calculate fuel injector pulse width in order to provide the desired air/fuel ratio.
- On some applications, MAF sensor input is used in determining transmission Electronic Pressure Control (EPC), shift and Torque Converter Clutch (TCC) scheduling.
- Cougar 2.0L, Escort 2.0L 4V, Econoline, Escape, Explorer, Focus, Mountaineer, Sable, Taurus and Windstar applications use MAF sensors that have Integrated By-Pass Technology (IBT) with an integrated Intake Air Temperature (IAT) sensor.
