The charging system consists of the following items:
The charging system is turned on and off with the ignition switch. When the ignition switch is turned to the ON position, battery voltage is applied to the alternator rotor through one of the two field terminals to produce a magnetic field. The alternator is driven by the engine through a serpentine belt and pulley arrangement.
The amount of DC current produced by the alternator is controlled by the EVR (field control) circuitry, contained within the PCM. This circuitry is connected in a series with the second rotor field terminal and ground.
All models are equipped with the On Board Diagnostics (OBD II). These OBD II systems including the EVR circuitry is monitored by the PCM. Each monitored circuit is assigned a Diagnostic Trouble Code (DTC). The PCM stores a DTC in the electronic memory for any failure it detects.