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The amount of DC current produced by the gener- ator is controlled by the EVR (field control) circuitry A battery temperature sensor, located in the bat- tery tray housing, is used to sense battery tempera- All vehicles are equipped with On-Board Diagnos- tics (OBD). All OBD-sensed systems, including EVR The Check Gauges Lamp (if equipped) monitors: charging system voltage, engine coolant tempera- DIAGNOSIS AND TESTING - CHARGING The following procedures may be used to diagnose the charging system if: • the check gauges lamp (if equipped) is illumi- nated with the engine running • the voltmeter (if equipped) does not register properly • an undercharged or overcharged battery condi- tion 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 INSPECTION The Powertrain Control Module (PCM) monitors critical input and output circuits of the charging sys- Refer to Diagnostic Trouble Codes in; Powertrain Control Module; Electronic Control Modules for more To perform a complete test of the charging system, refer to the appropriate Powertrain Diagnostic Proce- t scan tool. Per- form the following inspections before attaching the (1) Inspect the battery condition. Refer to 8, Bat- tery for procedures. (2) Inspect condition of battery cable terminals, battery posts, connections at engine block, starter (3) Inspect all fuses in both the fuseblock and Power Distribution Center (PDC) for tightness in (4) Inspect generator mounting bolts for tightness. Replace or tighten bolts if required. Refer to the Gen- (5) Inspect generator drive belt condition and ten- sion. Tighten or replace belt as required. Refer to (6) Inspect automatic belt tensioner (if equipped). Refer to 7, Cooling System for information. (7) Inspect generator electrical connections at gen- erator field, battery output, and ground terminal (if 8Fa - 2 CHARGING R1 CHARGING (Continued) |