Detection Condition
WARNING: This page is about a different car, the 2003 Mazda MPV and 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
PCM monitors input voltage from generator and battery. DTC is set when engine is running and generator voltage is more than 17 volts and battery voltage is less than 11 volts for 5 seconds.