Section 2 (Charging System - Generators & Regulators): Operation
WARNING: This page is about a different car, the 1998 Plymouth Breeze, 1998 Dodge Stratus, and 1998 Chrysler Cirrus. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (PCM) maintains a system charging voltage of approximately 13-15 volts. PCM determines a target voltage based on monitored voltage and inputs from battery temperature sensor. PCM compares target and battery voltages whenever engine is running. If battery voltage is less than target voltage, PCM will increase field current. If battery voltage is greater than target voltage, PCM will decrease field current.