Dodge 2000 DURANGO Service Manual page 281

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DESCRIPTION AND OPERATION
CHARGING SYSTEM. . . . . . . . . . . . . . . . . . . . . . . 1
GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
BATTERY TEMPERATURE SENSOR . . . . . . . . . . . 2
ELECTRONIC VOLTAGE REGULATOR . . . . . . . . . . 2
DIAGNOSIS AND TESTING
CHARGING SYSTEM. . . . . . . . . . . . . . . . . . . . . . . 2
ON-BOARD DIAGNOSTIC TEST FOR
CHARGING SYSTEM . . . . . . . . . . . . . . . . . . . . . 3
DESCRIPTION AND OPERATION
CHARGING SYSTEM
DESCRIPTION
The charging system consists of:
• Generator
• Electronic Voltage Regulator (EVR) circuitry
within the Powertrain Control Module (PCM)
• Ignition switch (refer to Ignition System for
information)
• Battery (refer to Battery for information)
• Battery temperature sensor
• Check Gauges Lamp (if equipped)
• Voltmeter
(refer to
Gauges for information)
• Wiring harness and connections (refer to 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 ASD relay is energized. When the
ASD relay is on, voltage is supplied to the ASD relay
sense circuit at the PCM. This voltage is connected
through the PCM and supplied to one of the genera-
tor field terminals (Gen. Source +) at the back of the
generator.
The amount of direct current produced by the gen-
erator is controlled by the EVR (field control) cir-
cuitry contained within the PCM. This circuitry is
connected in series with the second rotor field termi-
nal and ground.
A battery temperature sensor, located in the bat-
tery tray housing, is used to sense battery tempera-
ture. This temperature data, along with data from
monitored line voltage, is used by the PCM to vary
CHARGING SYSTEM
TABLE OF CONTENTS
page
Instrument Panel and
CHARGING SYSTEM
REMOVAL AND INSTALLATION
GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
BATTERY TEMPERATURE SENSOR . . . . . . . . . . . 4
SPECIFICATIONS
GENERATOR RATINGS . . . . . . . . . . . . . . . . . . . . . 5
TORQUE CHART . . . . . . . . . . . . . . . . . . . . . . . . . . 5
the battery charging rate. This is done by cycling the
ground path to control the strength of the rotor mag-
netic field. The PCM then compensates and regulates
generator current output accordingly.
All vehicles are equipped with On-Board Diagnos-
tics (OBD). All OBD-sensed systems, including EVR
(field control) circuitry, are monitored by the PCM.
Each monitored circuit is assigned a Diagnostic Trou-
ble Code (DTC). The PCM will store a DTC in elec-
tronic memory for certain failures it detects. Refer to
On-Board Diagnostics in Emission Control System
for more DTC information.
The Check Gauges Lamp (if equipped) monitors:
charging system voltage, engine coolant tempera-
ture and engine oil pressure. If an extreme condition
is indicated, the lamp will be illuminated. This is
done as a reminder to check the three gauges. The
signal to activate the lamp is sent via the multi-
plexed bus circuits. The lamp is located on the
instrument panel. Refer to Instrument Panel and
Gauges for additional information.
GENERATOR
DESCRIPTION
The generator is belt-driven by the engine using a
serpentine type drive belt. It is serviced only as a
complete assembly. If the generator fails for any rea-
son, the entire assembly must be replaced.
OPERATION
As the energized rotor begins to rotate within the
generator, the spinning magnetic field induces a cur-
rent into the windings of the stator coil. Once the
generator begins producing sufficient current, it also
provides the current needed to energize the rotor.
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