Voltage Regulator - Dodge Dakota Sport 2001 Service Manual

8F - 28 CHARGING
GENERATOR (Continued)
Fig. 5 Generator Connectors—Typical Bosch
1 - FIELD WIRE CONNECTOR
2 - FIELD WIRES
3 - B+ (OUTPUT TERMINAL)
Fig. 6 Generator Connectors—Typical Denso
1 - FIELD WIRES
2 - B+ (OUTPUT TERMINAL)
3 - FIELD WIRE CONNECTOR
(3) Install generator
tighten as follows:
• Generator mounting bolt 3.9L/5.9L engines—41
N·m (30 ft. lbs.) torque.
• Generator pivot bolt/nut 3.9L/5.9L engines—41
N·m (30 ft. lbs.) torque.
• Generator mounting bolt 2.5L engine—55 N·m
(41 ft. lbs.) torque.
• Generator pivot bolt 2.5L engine—55 N·m (41 ft.
lbs.) torque.
mounting fasteners
• Vertical mounting bolt 4.7L engine—55 N·m (40
ft. lbs.)
• Long horizontal mounting bolt 4.7L engine—55
N·m (40 ft. lbs.)
• Short horizontal mounting bolt 4.7L engine—74
N·m (55 ft. lbs.)
CAUTION: Never force a belt over a pulley rim
using a screwdriver. The synthetic fiber of the belt
can be damaged.
CAUTION: When installing a serpentine accessory
drive belt, the belt MUST be routed correctly. The
water pump will be rotating in the wrong direction if
the belt is installed incorrectly, causing the engine
to overheat. Refer to belt routing label in engine
compartment, or refer to Belt Schematics in 7, Cool-
ing System.
(4) Install generator drive belt. Refer to 7, Cooling
System for procedure.
(5) Snap cable protector cover to B+ mounting stud.
(6) Install negative battery cable to battery.

VOLTAGE REGULATOR

DESCRIPTION
The Electronic Voltage Regulator (EVR) is not a
separate component. It is actually a voltage regulat-
ing circuit located within the Powertrain Control
Module (PCM). The EVR is not serviced separately. If
replacement is necessary, the PCM must be replaced.
OPERATION
The amount of DC current produced by the generator
is controlled by EVR circuitry contained within the
PCM. This circuitry is connected in series with the gen-
erators second rotor field terminal and its ground.
Voltage is regulated by cycling the ground path to
control the strength of the rotor magnetic field. The
EVR circuitry monitors system line voltage (B+) and
battery temperature (refer to Battery Temperature
Sensor for more information). It then determines a
target charging voltage. If sensed battery voltage is
0.5 volts or lower than the target voltage, the PCM
and
grounds the field winding until sensed battery volt-
age is 0.5 volts above target voltage. A circuit in the
PCM cycles the ground side of the generator field up
to 100 times per second (100Hz), but has the capabil-
ity to ground the field control wire 100% of the time
(full field) to achieve the target voltage. If the charg-
ing rate cannot be monitored (limp-in), a duty cycle
of 25% is used by the PCM in order to have some
generator output. Also refer to Charging System
Operation for additional information.
AN