DTC P0102: Mass Airflow Sensor Circuit Low Frequency: Description

Mass Airflow (MAF) sensor is an airflow meter that measures the amount of air entering the engine. Powertrain Control Module (PCM) uses MAF sensor signal in order to provide correct fuel delivery for a wide range of engine speeds and loads. A small quantity of air entering the engine indicates deceleration or idle. A large quantity of air entering the engine indicates an acceleration or high load situation. MAF sensor has an ignition 1 voltage circuit, a ground circuit and a signal circuit. PCM applies a voltage to MAF sensor on signal circuit. MAF sensor uses the voltage in order to produce a frequency based on inlet airflow through sensor bore. Frequency will vary within a range of around 2000 Hz at idle to about 10,000 Hz at maximum engine load. DTC P0102 will set if the PCM detects a frequency signal lower than possible range of a normally operating MAF sensor.