DTC P0101: Mass Airflow (MAF) Sensor Circuit Range/Performance Problem: Notes

Fig 1: Outline View Of Engine System Structure

Courtesy of AMERICAN HONDA MOTOR CO., INC.

The mass airflow (MAF) sensor directly measures the amount of intake airflow into the engine, and the powertrain control module (PCM) controls the fuel injection based on the measured value. The manifold absolute pressure (MAP) sensor measures the intake manifold pressure, and the PCM calculates the amount of intake airflow from the MAP sensor output and the engine revolutions. The PCM compares the MAF sensor output (amount of intake airflow) and the amount of intake airflow calculated from MAP sensor output. If their difference is too large (in the malfunction area), the PCM detects a malfunction and stores a DTC.