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Discuss 2003 Cavalier Alternator in the alt.autos.gm forum at Car Dealer Forums; "tango" <tango@cynet.com> wrote in message news:Xns9A6AF3CFD5E02bat222@216.77.188.18... >I have a neighbor who has a 2003 Cavalier ...
  1. #1
    HLS
    Guest

    Default Re: 2003 Cavalier Alternator


    "tango" <tango@cynet.com> wrote in message
    news:Xns9A6AF3CFD5E02bat222@216.77.188.18...
    >I have a neighbor who has a 2003 Cavalier with the 2.2 Ecotec engine and a
    > manual transmission which has an alternator problem. It puts out about 13V
    > which doesn't fully charge the battery.
    > It looks like you can remove the air duct for the intake and get the
    > alternator out.
    > Could someone elaborate on the difficulty and time to change out the
    > alternator.


    I cant be specific. I have seen those engines in other applications, and
    some
    are more complex than others. I would guess about 30 minutes to one hour,
    based on the other ones I have seen.

    You may have an entirely different situation.




    › See More: 2003 Cavalier Alternator

  2. #2
    Woody
    Guest

    Default Re: 2003 Cavalier Alternator

    Make sure you are testing the generator correctly. I can't say for the 2003
    but the 2006 cobalt and my 2004 Odyssey have ECM controlled charging systems
    so I think that does also. You need the service manual to determine the
    correct check procedures. Why do you think the alternator is bad? Based on a
    simple voltage check?


    "tango" <tango@cynet.com> wrote in message
    news:Xns9A6AF3CFD5E02bat222@216.77.188.18...
    >I have a neighbor who has a 2003 Cavalier with the 2.2 Ecotec engine and a
    > manual transmission which has an alternator problem. It puts out about 13V
    > which doesn't fully charge the battery.
    > It looks like you can remove the air duct for the intake and get the
    > alternator out.
    > Could someone elaborate on the difficulty and time to change out the
    > alternator.
    >




  3. #3
    Mike Marlow
    Guest

    Default Re: 2003 Cavalier Alternator


    "Woody" <TheDuck@pond.net> wrote in message
    news:GcXFj.5325$6H.2332@newssvr22.news.prodigy.net ...

    > Make sure you are testing the generator correctly.


    Woody - you're dating yourself...

    --

    -Mike-
    mmarlowREMOVE@alltel.net



  4. #4
    Woody
    Guest

    Default Re: 2003 Cavalier Alternator

    I am but it has come full circle as in my 2006 Cobalt service manual it is
    called a generator again.....
    And as I mentioned above it has a very elaborate charging methods depending
    on many environmental and engine/driving parameters. No more throwing a
    voltmeter on the battery and looking for 14+ volts as the output can be as
    low as 12/13 volts depending on the charge state of the battery that the ECM
    has detected...

    "Mike Marlow" <mmarlowREMOVE@alltel.net> wrote in message
    news:ec61e$47e872c3$6215ac84$28496@ALLTEL.NET...
    >
    > "Woody" <TheDuck@pond.net> wrote in message
    > news:GcXFj.5325$6H.2332@newssvr22.news.prodigy.net ...
    >
    >> Make sure you are testing the generator correctly.

    >
    > Woody - you're dating yourself...
    >
    > --
    >
    > -Mike-
    > mmarlowREMOVE@alltel.net
    >




  5. #5
    Silver Surfer
    Guest

    Default Re: 2003 Cavalier Alternator

    Document ID# 862445
    2003 Chevrolet Cavalier
    --------------------------------------------------------------------------------

    Charging System Description and Operation

    Generator
    The generator features the following major components:

    The delta stator
    The rectifier bridge
    The rotor with slip rings and brushes
    A conventional pulley
    Dual internal fans
    The regulator
    The pulley and the fan cool the slip ring and the frame.

    The generator features permanently lubricated bearings. Service should only
    include tightening of mount components. Otherwise, replace the generator as
    a complete unit.

    Regulator
    The voltage regulator controls the rotor field current in order to limit the
    system voltage. When the field current is on, the regulator switches the
    current on and off at a rate of 400 cycles per second in order to perform
    the following functions:

    Radio noise control
    Obtain the correct average current needed for proper system voltage control
    At high speeds, the on-time may be 10 percent with the off-time at 90
    percent. At low speeds, the on-time may be 90 percent and the off-time 10
    percent.

    Circuit Description
    The generator provides voltage to operate the vehicle's electrical system
    and to charge its battery. A magnetic field is created when current flows
    through the rotor. This field rotates as the rotor is driven by the engine,
    creating an AC voltage in the stator windings. The AC voltage is converted
    to DC by the rectifier bridge and is supplied to the electrical system at
    the battery terminal.

    When the engine is running, the generator turn-on signal is sent to the
    generator from the PCM, turning on the regulator. The generator's voltage
    regulator controls current to the rotor, thereby controlling the output
    voltage. The rotor current is proportional to the electrical pulse width
    supplied by the regulator. When the engine is started, the regulator senses
    generator rotation by detecting AC voltage at the stator through an internal
    wire. Once the engine is running, the regulator varies the field current by
    controlling the pulse width. This regulates the generator output voltage for
    proper battery charging and electrical system operation. The generator F
    terminal is connected internally to the voltage regulator and externally to
    the PCM. When the voltage regulator detects a charging system problem, it
    grounds this circuit to signal the PCM that a problem exists. The PCM
    monitors the generator field duty cycle signal circuit. The system voltage
    sense circuit receives battery positive voltage that is Hot At All Times
    through a fuse link that is connected to the starter motor. This voltage is
    used by the regulator as the reference for system voltage control.

    Charging System Indicator
    The IPC illuminates the charge indicator in the message center when the
    following occurs:

    . The PCM detects that the generator output is less than 11 volts or
    greater than 16 volts. The IPC receives a class 2 message from the PCM
    requesting illumination.

    . The IPC determines that the system voltage is less than 11 volts or
    greater than 16 volts. The IPC receives a class 2 message from the body
    control module (BCM) indicating the system voltage.

    . The IPC performs the displays test at the start of each ignition
    cycle. The indicator illuminates for approximately 3 seconds.

    . The ignition is ON, with the engine OFF.




    "tango" <tango@cynet.com> wrote in message
    news:fT_Fj.25768$vr3.5923@bignews2.bellsouth.net.. .
    > "Woody" <TheDuck@pond.net> wrote in
    > news:GcXFj.5325$6H.2332@newssvr22.news.prodigy.net :
    >
    >> Make sure you are testing the generator correctly. I can't say for the
    >> 2003 but the 2006 cobalt and my 2004 Odyssey have ECM controlled
    >> charging systems so I think that does also. You need the service
    >> manual to determine the correct check procedures. Why do you think the
    >> alternator is bad? Based on a simple voltage check?
    >>

    > I don't intend to recommend he change out the alternator without it being
    > properly diagnosed but wanted to find if there was any obvious problem
    > with
    > the removal.
    > A battery's voltage when fully charged is about 12.6 volts so 13 volts
    > will
    > not keep it charged. No factory manual is necessary to determine this. The
    > only question is if the regulator not setting up the proper field current
    > or a defective alternator.
    > It is not possible to check the Alternator terminals until some air duct
    > is
    > removed.
    > I called an auto electric service shop today and the guy said from about
    > 60
    > to 80 bucks for the repair if the alternator is the problem.
    > Will have to verify whether the regulator is indeed in the alternator or
    > externally controlled and check the alternator terminals but it points to
    > the regulator or alternator.
    > thanks for the response
    >
    >



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