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HOMESERVICE MANUALSMERCURY2010MARINER HYBRID, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 679 (ENGINE CONTROLS - DESCRIPTION AND OPERATION -- DIESEL)ENGINE CONTROL COMPONENTSMASS AIR FLOW (MAF) SENSOR
2010 Mercury Mariner Hybrid, AWD

Mass Air Flow (MAF) Sensor

2010 Mercury Mariner Hybrid, AWDSECTION Mass Air Flow (MAF) Sensor
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2007 Ford RV Cutaway, 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.

The MAF sensor provides an analog voltage signal to the PCM proportional to the intake air mass. The MAF sensor uses a hot wire sensing element to measure the amount of air entering the engine. The hot wire is maintained at 200°C (392°F) above the ambient temperature. Air passing over the hot wire cools the wire. The current required to maintain the temperature of the hot wire is proportional to the air mass flow. The MAF signal is used to calculate the EGR flow rate and for concern detection.

The current PCM implementation contains a mass air flow interface, which consists of a 2-pole, differential input, low pass filter. This filter is designed to pass an analog signal, originating from the mass air sensor, while rejecting unwanted ignition noise, high frequency electrical interference, and ground offsets. The input to the interface is the analog voltage signal difference between MAF+ (mass air flow signal) and MAF- (mass air flow return). The MAF sensor output an analog voltage signal calibrated to 0.5 V at the lower limit of the flow range and 4.75 V at the upper limit of the flow range.

Fig 1: F-Super Duty Mass Air Flow (MAF) Sensor
GF0001609Courtesy of FORD MOTOR CO.
RENDER: 1.0x

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