DTC P0103: MAF Sensor Circuit High Input: 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 4.89 volts with engine running. This is a continuous monitor. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:

MAF sensor malfunction.
Open circuit between PCM and MAF sensor.
Open circuit between ground and MAF sensor.