As intake air passes over this wire, it is cooled and within a few milliseconds, the PCM heats this wire back up to 100 degrees above the Intake Air Temperature Sensor reading. The PCM constantly adjusts the amperage to this Mass Air Flow Sensing wire in order to maintain a temperature that is precisely 100 degrees above the Intake Air Temperature. The most commonly used Mass Air Flow Sensor employs a precisely heated wire that spans a vortex in front of the Throttle Body on the Intake Manifold. The units of measurement are typically expressed in grams per second or GPS. The purpose of the Mass Air Flow Sensor is to measure the amount of air entering the engine.
NOX (Oxides of Nitrogen): One of the two ingredients that, when exposed to sunlight, cause smog HCs (Hydrocarbons): Unburned droplets of raw fuel that smell, affect breathing, and contribute to smogĬO (Carbon Monoxide): Partially burned fuel that is an odorless and deadly poisonous gas Mass Air Flow Sensor circuit and or wiring problemsĭirty or contaminated Mass Air Flow Sensing wire or filament
Large vacuum leaks, split Intake Air Boot or PCV Hose, defective intake manifold gaskets In other cases, there may performance problems, such as a lack of power on acceleration, "coughing," misfiring, and/or backfiringīlack smoke from the tail pipe and poor fuel mileage In some cases, there may be no adverse conditions noticed by the driver Code P0101 is set when this sensor's output becomes irrational and/or out of range. This is important information the Engine Control Module (ECM) uses to calculate the proper amount of fuel for combustion and the amount of ignition timing advance. The Mass Airflow Sensor (MAF) measures the amount of air entering the engine. OBD-II Code P0101 is defined as a Mass Air Flow Sensor Circuit/Performance Malfunction
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