Question about 1990 Plymouth Voyager

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1990 GRAND VOYAGER 3.3L NOT CHARGING CHECKED ALT GOOD CAN NOT FIND REGULATOR?? CHANGED PMC NO CHANGE HELP..

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It is the ECM (Engine Control Module) you are looking to find. It is located between the battery and the firewall it mounts on.
This is what houses the regulator and it needs to be replaced as a unit.
You can find it online for about $200+ core.

Posted on Nov 15, 2009

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Hope this is helpful, Ian

CHARGING
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 section
for information)
† Battery (refer to the Battery section for information)
† Battery temperature sensor
† Voltmeter (refer to the Instrument Cluster section
for information)
† Wiring harness and connections (refer to the
Wiring section for information)
† Accessory drive belt (refer to the Cooling section
for more information)
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. 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 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.
The amount of DC current produced by the generator
is controlled by the EVR (field control) circuitry
contained within the PCM. This circuitry is connected
in series with the second rotor field terminal
and ground.
A battery temperature sensor is used to sense battery
temperature. This temperature data, along with
data from monitored line voltage, 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 voltage
based on battery temperature.
All vehicles are equipped with On-Board Diagnostics
(OBD). All OBD-sensed systems, including EVR
(field control) circuitry, are monitored by the PCM.
Each monitored circuit is assigned a Diagnostic Trouble
Code (DTC). The PCM will store a DTC in electronic
memory for certain failures it detects. Refer to
On-Board Diagnostics in the Electronic Control Modules(
Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/POWERTRAIN CONTROL
MODULE - DESCRIPTION) section for more DTC
information.
The Check Gauges Lamp (if equipped) monitors:
charging system voltage, engine coolant temperature
and engine oil pressure. If an extreme condition
is indicated, the lamp will be illuminated. This is
done as reminder to check the three gauges. 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
information.
VOLTAGE REGULATOR
DESCRIPTION
The Electronic Voltage Regulator (EVR) is not a
separate component. It is actually a voltage regulating
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 generators 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 or inlet air temperature sensor
(refer to Battery Temperature Sensor or Inlet Air
Temperature Sensor for more information). It then
determines a target charging voltage. If sensed battery
voltage is 325 mv or lower than the target voltage,
the PCM grounds the field winding until sensed
battery volage is 325 mv above target voltage. A circuit
in the PCM cycles the ground side of the generator
field up to 250 times per second (250Hz), but
has the capability to ground the field control wire
100% of the time (full field) to achieve the target
voltage. If the charging 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.
REMOVAL
The electronic voltage regulator is not a serviced
separately. If replacement is necessary, the PCM
must be replaced.

Posted on Jul 30, 2009

  • Ian Percy Jul 30, 2009


    Does not drive generator

    (Generator not Charging)

    Clutch failure Replace Decoupler

  • Ian Percy Jul 30, 2009


    BATTERY TEMPERATURE

    SENSOR

    DESCRIPTION

    The PCM incorporates a Battery Temperature Sensor

    (BTS) on its circuit board.

    OPERATION

    The PCM uses the temperature of the battery area

    to control the charge rate. This temperature data,

    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 temperature around the battery

    increases.

    The function of the battery temperature sensor

    (BTS) is to enable control of the generator output

    based upon ambient battery temperature. As battery

    temperature increases, the charging rate should

    decrease. As battery temperature decreases, the

    charging rate should increase. The sensor functions

    similar to the ECT sensor with one major difference,

    the ambient sensor does not have a dual temperature

    range program. The PCM maintains the optimal output

    of the generator by monitoring battery voltage

    and controlling battery voltage to a range of

    13.5-14.7 volts based on battery temperature.

    The battery temperature sensor is also used for

    OBD II diagnostics. Certain faults and OBD II monitors

    are either enabled or disabled depending upon

    the battery temperature sensor input (example: disable

    purge and EGR, enable LDP). Most OBD II

    monitors are disabled below 20°F.

    REMOVAL

    The battery temperature sensor is not a serviced

    separately. If replacement is necessary, the PCM

    must be replaced.

    GENERATOR

    DESCRIPTION

    The generator is belt-driven by the engine. It is

    serviced only as a complete assembly. The generator

    produces DC voltage at the B+ terminal. If the generator

    is failed, the generator assembly subcomponents

    (generator and decoupler pulley) must be

    inspected for individual failure and replaced accordingly.

    OPERATION

    As the energized rotor begins to rotate within the

    generator, the spinning magnetic field induces a current

    into the windings of the stator coil. Once the

    generator begins producing sufficient current, it also

    provides the current needed to energize the rotor.

    The Y type stator winding connections deliver the

    induced AC current to 3 positive and 3 negative

    diodes for rectification. From the diodes, rectified DC

    current is delivered to the vehicles electrical system

    through the generator, battery, and ground terminals.

    Noise emitting from the generator may be caused

    by:

    Worn, loose or defective bearings

    † Loose or defective drive pulley (2.4L) or decoupler

    (3.3/3.8L)

    † Incorrect, worn, damaged or misadjusted drive

    belt

    † Loose mounting bolts

    † Misaligned drive pulley

    † Defective stator or diode

    † Damaged internal fins

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