This DTC sets when the PCM detects that the MAF sensor frequency is below a predetermined value. This diagnostic tests for too low an airflow rate. The PCM determines if the sensor is stuck low, stuck high, not providing the airflow value expected for a given operating condition, or that the signal appears to be stuck based on a lack of signal variation expected during the normal operation. The PCM monitors the MAF sensor frequency. The PCM calculates the air flow (grams per second) based on this signal. The MAF sensor converts the changes in current draw to a frequency signal read by the PCM. The MAF sensor requires a greater amount of current in order to maintain the hot wires at a constant temperature as the air flow increases. The amount of cooling is proportional to the amount of air flow. ![]() Air flowing through the sensor cools the sensing elements. The MAF output frequency is a function of the power required to keep the air flow sensing elements (hot wires) at a fixed temperature above the ambient temperature. This engine uses the MAF sensor in order to measure air flow rate. The MAF sensor used on this engine is a hot wire type. The MAF sensor has a battery feed, a ground, and a signal circuit. The direct measurement of the air entering the engine is more accurate than calculating the airflow from the MAP, the IAT, and the engine speed (speed/density). The Mass Air Flow (MAF) sensor measures the amount of air ingested by the engine. Quote:DTC P0102 Mass Air Flow (MAF) Sensor Circuit Low Frequency
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