Patent Document ID: 20180196106
Application ID: 15399947
Patent Flag: 0

Claim One:
1. A method for monitoring a DC power source that is electrically connected to a charging system that is disposed on an internal combustion engine that is disposed on a vehicle, the method comprising: determining a State of Charge (SOC) for the DC power source; and upon detecting that the SOC is less than a threshold SOC that is associated with starting the internal combustion engine: evaluating, via a controller, states associated with a plurality of potential root causes related to the SOC being less than the threshold SOC, determining that at least one of the potential root causes is a candidate root cause based upon the states, determining a fault probability for each candidate root cause, and determining that one of the candidate root causes is a final root cause based upon the fault probabilities associated with each of the candidate root causes; and communicating, via a service connector, the final root cause from the controller to an off-board device.