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CHARGING SYSTEM DESCRIPTION The charging system consists of: • Generator • Electronic Voltage Regulator (EVR) circuitry within the Powertrain Control Module (PCM) • Ignition switch • Battery (refer to 8, Battery for information) • Battery temperature sensor • Generator Lamp (if equipped) • Check Gauges Lamp (if equipped) • Wiring harness and connections (refer to 8, Wiring for information) OPERATION The charging system is turned on and off with the ignition switch. The system is on when the engine is running and The amount of DC current produced by the generator is controlled by the EVR (field control) circuitry contained A battery temperature sensor, located in the battery tray housing, is used to sense battery temperature. This tem- All vehicles are equipped with On-Board Diagnostics (OBD). All OBD-sensed systems, including EVR (field control) The Check Gauges Lamp (if equipped) monitors: charging system voltage, engine coolant temperature and DIAGNOSIS AND TESTING - CHARGING SYSTEM The following procedures may be used to diagnose the charging system if: • the check gauges lamp (if equipped) is illuminated with the engine running • the voltmeter (if equipped) does not register properly • an undercharged or overcharged battery condition occurs. Remember that an undercharged battery is often caused by: • accessories being left on with the engine not running • a faulty or improperly adjusted switch that allows a lamp to stay on. Refer to Ignition-Off Draw Test in 8, Bat- INSPECTION The Powertrain Control Module (PCM) monitors critical input and output circuits of the charging system, making sure Refer to Diagnostic Trouble Codes in; Powertrain Control Module; Electronic Control Modules for more DTC infor- To perform a complete test of the charging system, refer to the appropriate Powertrain Diagnostic Procedures ser- T scan tool. Perform the following inspections before attaching the scan tool. 8F - 26 CHARGING SYSTEM KJ |