DTC P1633: Battery Overcharge: Condition
WARNING: This page is about a different car, the 2002 Mazda Protege5 and 2002 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when PCM detects generator output is more than 18.5 volts or battery voltage is more than 16.0 volts for 5 seconds. Possible causes are:
- Generator malfunction (overcharge).
- PCM malfunction.
- Short circuit between generator and PCM.