P1100 FORD, LINCOLN, MAZDA, MERCURY: MASS AIR FLOW SENSOR INTERMITTENT
Description of DTC code P1100
The MAF (Mass Air Flow Sensor) measures and reports how much air enters the engine. This data is transmitted to the PCM (Powertrain Control Module), which will use it to determine the engine load.
Although there are several designs of the MAF sensor, the most common is the hot wire design. There are two wires, one of them is heated and the other is not. A microprocessor inside the sensor determines the amount of air entering the motor by the amount of current required for the wire to be about 200°F hotter than the cold wire. Each time the temperature difference between the two wires varies, the sensor increases or decreases the current to the hot wire. This means more air or less air in the motor.
The MAF sensor circuit is continuously monitored by the PCM for sudden changes in voltage input or airflow. If during the last 40 warm-up cycles the PCM detects a voltage change far above or far below the calibrated limit, the P1100 OBDII fault code will be set.