Mass Air Flow (MAF) Sensor
WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2000 Mercury Villager, 2000 Mercury Mountaineer, 2000 Lincoln Navigator, 2000 Ford Windstar, and 2000 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
- The mass air flow (MAF) sensor uses a hot wire sensing element to measure the amount of air entering the engine.
- Air passing over the hot wire causes it to cool.
- This hot wire is maintained at 200°C (392°F) above ambient temperature as measured by a constant cold wire.
- If the hot wire electronic sensing element must be replaced, then the entire assembly must be replaced.
- Replacing only the element may change the air flow calibration. The current required to maintain the temperature of the hot wire is proportional to the air mass flow.
- The MAF sensor then outputs an analog voltage signal to the PCM proportional to the intake air mass. The PCM calculates the required fuel injector pulse width in order to provide the desired air/fuel ratio. This input is also used in determining transmission electronic pressure control (EPC), shift and torque converter clutch scheduling.
- Some MAF sensors have integrated bypass technology (IBT) with an integrated intake air temperature (IAT) sensor.
- The present applications with IBT are: Focus, Escort (4V), 2.0L Contour/Mystique, Cougar, Taurus/Sable, Windstar, Explorer/Mountaineer and E-Series.
The Mass Air Flow (MAF) Sensor is located between the air cleaner and the throttle body or inside the air cleaner assembly.