DTC P1634: Generator Terminal "B" Circuit Open: 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 17 volts and battery voltage is less than 11 volts for 5 seconds with engine running. Possible causes are:
- Battery malfunction.
- Open circuit between battery and generator.
- PCM malfunction.