DTC P1100: MAF Sensor Intermittent Malfunction: Condition
WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when Powertrain Control Module (PCM) detects input voltage from Mass Airflow (MAF) sensor is less than .23 volt or more than 4.6 volts when engine is running. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible cause is MAF sensor malfunction.