Chrysler Pacifica. Manual — part 487
CHARGING
TABLE OF CONTENTS
page
page
CHARGING
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BATTERY TEMPERATURE SENSOR
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
. . . . . . . . . . . . . . . . . . . . . . . . . 18
GENERATOR
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
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CHARGING
SPECIFICATIONS
TORQUE
DESCRIPTION
N·m
Ft. Lbs.
In. Lbs.
Generator Mounting Bolts
54.2
40
Generator Upper Bracket
Bolts
28.2
20.8
250
Generator Decoupler
110
81
Generator B+ Nut
12.5
110
Battery Clamps
4.5
40
Battery Hold Down
20.3
180
BATTERY TEMPERATURE
SENSOR
REMOVAL
(1) Disconnect and isolate the battery negative
cable then the positive cable.
(2) Remove battery from battery tray.
(3) Disconnect the Battery Temperature Sensor
electrical connector (Fig. 1).
(4) Unsnap the Battery Temperature Sensor from
the battery tray and remove the sensor by pushing in
the snap fits and pushing up out of tray (Fig. 2).
Fig. 1 VACUUM RESERVOIR/BATTERY
TEMPERATURE SENSOR
CS
CHARGING
8F - 17
INSTALLATION
(1) Install the Battery Temperature Sensor to the
battery tray. Make sure that the spring is installed
with the sensor (Fig. 3).
(2) Connect the Battery Temperature Sensor elec-
trical connector (Fig. 4).
(3) Make sure that the sensor moves vertically in
the battery tray by pushing on the sensor. The sensor
should move with each push and return to the orig-
nal location after pressure is removed.
(4) Install battery to battery tray.
(5) Connect the battery positive cable then the
negative cable.
GENERATOR
DESCRIPTION - CHARGING SYSTEM
The charging system consists of:
• Generator
• Decoupler Pulley (If equipped)
• Electronic Voltage Regulator (EVR) circuitry
within the Powertrain Control Module (PCM)
• Ignition switch (refer to the Ignition System sec-
tion for information)
• Battery (refer to the Battery section for informa-
tion)
• Ambient Air Temperature (If equipped)
• Inlet Air Temperature (calculated battery tem-
perature)(If equipped)
• Voltmeter (refer to the Instrument Cluster sec-
tion for information if equipped)
• Wiring harness and connections (refer to the
Wiring section for information)
• Accessory drive belt (refer to the Cooling section
for more information)
• Battery Temperature sensor (if equipped)
OPERATION - CHARGING SYSTEM
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. The ASD
relay is energized when the PCM grounds the ASD
control circuit. This voltage is connected through the
PCM or IPM (intelligent power module) (if equipped)
and supplied to one of the generator field terminals
(Gen. Source +) at the back of the generator.
The generator is driven by the engine through a
serpentine
belt
and
pulley
or
decoupler
pulley
arrangement.
Fig. 2 BATTERY TEMPERATURE SENSOR &
SPRING WASHER
Fig. 3 BATTERY TEMPERATURE SENSOR &
SPRING WASHER
Fig. 4 SENSOR IN BATTERY TRAY
8F - 18
CHARGING
CS
BATTERY TEMPERATURE SENSOR (Continued)
The amount of DC current produced by the gener-
ator is controlled by the EVR (field control) circuitry
contained within the PCM. This circuitry is con-
nected in series with the second rotor field terminal
and ground.
An Battery temperature sensor is used to calculate
the temperature near the battery. This temperature
data, along with data from monitored line voltage
(battery voltage sense circuit), is used by the PCM to
vary the battery charging rate. This is done by
cycling the ground path to control the strength of the
rotor magnetic field. The PCM then compensates and
regulates generator current output accordingly to
maintain system voltage at the targeted system volt-
age based on battery temperature.
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 and
illuminate the (MIL) lamp. Refer to On-Board Diag-
nostics in the Electronic Control Modules (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MOD-
ULES/POWERTRAIN
CONTROL
MODULE
-
DESCRIPTION) section for more DTC information.
The Charging system “Battery” light indicates
problems with the charging system (voltage too high/
low, generator failure, etc.). If an extreme condition is
indicated, the lamp will be illuminated. The signal to
activate the lamp is sent via the PCI bus circuits.
The lamp is located on the instrument panel. Refer
to the Instrument Cluster section for additional infor-
mation.
The PCM uses the Battery temperature sensor to
control the charge system voltage. This temperature,
along with data from monitored line voltage, is used
by the PCM to vary the battery charging rate. The
system voltage is higher at cold temperatures and is
gradually reduced as the calculated battery tempera-
ture increases.
The ambient temperature sensor is used to control
the battery voltage based upon ambient temperature
(approximation of battery temperature). The PCM
maintains the optimal output of the generator by
monitoring battery voltage and controlling it to a
range of 13.5 - 14.7 volts based on battery tempera-
ture.
REMOVAL
3.5L
(1) Disconnect battery negative cable.
(2) Remove the engine cover.
(3) Remove the generator drive belt.
(4) Remove the B+ terminal nut and wire (Fig. 5).
(5) Disconnect the generator field circuit wiring
connector (Fig. 5). Push the RED locking tab to
release.
Fig. 5 POSITIVE BATTERY CABLE & FIELD
CONNECTOR
Fig. 6 UPPER MOUNTING BRACKET
CS
CHARGING
8F - 19
GENERATOR (Continued)
(6) Remove the upper mounting bracket (Fig. 6).
(7) Remove the 2 lower mounting bolts (Fig. 7).
(8) Remove generator.
3.8L
(1) Disconnect negative battery cable.
(2) Remove the air box assembly, refer to (Refer to
9 - ENGINE/AIR INTAKE SYSTEM/AIR CLEANER
HOUSING - REMOVAL).
(3) Generator location (Fig. 8).
(4) Unlock the field electrical connector (Fig. 9).
(5) Disconnect the field electrical connector from
rear of generator (Fig. 10).
Fig. 7 GENERATOR
Fig. 8 GENERATOR LOCATION
Fig. 9 GENERATOR FIELD CONNECTOR
1 - Connector Lock
2 - Field Connector
Fig. 10 ELECTRICAL CONNECTOR LOCK
1 - Connector Lock
2 - Field Connector
8F - 20
CHARGING
CS
GENERATOR (Continued)
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