Charging System - Smart Alternator: Notes

The PCM does not directly perform diagnostics for the Smart Alternator. However, the PCM does store and report the faults communicated from the Smart Alternator via the LIN bus circuit. The PCM diagnostic monitor compares the reported battery voltage from the Intelligent Battery Sensor (IBS) to the currently requested set voltage from the Smart Alternator. A fault will be detected if the absolute difference (VOLTAGE_DELTA) between commanded Smart Alternator and actual IBS voltage values vary from one another above a calibrated threshold over an accumulated period.