Chrysler

Chrysler Repair Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Chrysler

2004 chrysler 300m: 3.5 is the voltage regulator..alternator

Customer Question
2004 chrysler 300m -3.5 is...
2004 chrysler 300m -3.5 is the voltage regulator in the alternator or computer?
Submitted: 8 years ago.Category: Chrysler
Show More
Show Less
Ask Your Own Chrysler Question
Answered in 3 minutes by:
12/22/2009
Chrysler Mechanic: Eric, Automotive Repair Shop Manager replied 8 years ago
Eric
Eric, Automotive Repair Shop Manager
Category: Chrysler
Satisfied Customers: 33,170
Experience: 20+ years experience as automotive store manager and technician.
Verified

Hi,

 

It is located in the powertrain control module and is not servicable by itself:

 

2004 Chrysler 300M V6-3.5L VIN G

CHARGING
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)
  • Inlet Air Temperature (calculated battery temperature)
  • Voltmeter (refer to the Instrument Cluster section 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)

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.

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.

An Inlet air 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 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 and illuminate the (MIL) lamp. Refer to On-Board Diagnostics in the Electronic Control Modules (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - DESCRIPTION) section for more DTC information.

The Check Gauges Lamp (if equipped) or Battery Lamp monitors: charging system voltage, engine coolant temperature and engine oil pressure. 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 information.

The PCM uses the inlet air 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 temperature 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 temperature.

GENERATOR
The generator is belt-driven by the engine. It is serviced only as a complete assembly. If the generator fails for any reason, the entire assembly must be replaced. The generator produces DC voltage.

As the energized rotor begins to rotate within the generator, the spinning magnetic field induces a current into the windings of the stator coil.

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
  • Incorrect, worn, damaged or misadjusted drive belt
  • Loose mounting bolts
  • Misaligned drive pulley
  • Defective stator or diode
  • Damaged internal fins

VOLTAGE REGULATOR
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.

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 calculated battery temperature or inlet air temperature sensor (refer to Inlet Air Temperature Sensor, if equipped, for more information ). It then determines a target charging voltage. If sensed battery voltage is lower than the target voltage, the PCM grounds the field winding until sensed battery voltage is at the target voltage. A circuit in the PCM cycles the ground side of the generator field at 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.

Eric
Eric, Automotive Repair Shop Manager
Category: Chrysler
Satisfied Customers: 33,170
Experience: 20+ years experience as automotive store manager and technician.
Verified
Eric and 87 other Chrysler Specialists are ready to help you
Ask your own question now
Ask Eric Your Own Question
Eric
Eric
Eric, Automotive Repair Shop Manager
Category: Chrysler
Satisfied Customers: 33,170
33,170 Satisfied Customers
Experience: 20+ years experience as automotive store manager and technician.

Eric is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I was skeptical at first but thought I'd give it a try. I was pleasantly surprised. Your site actually is a quality service that I would recommend to others in a heartbeat.

StanSayre, PA

I AM VERY GLAD THAT I TOOK A CHANCE ON YOUR PROBLEM SOLVING SKILLS. I WAS SUCCESSFUL IN REPLACING THE FUEL PUMP. MY TRUCK RUNS LIKE A CLOCK. IT RUNS LIKE THE DAY I BOUGHT IT. NO LUNGING FORWARD, THE TURBO REACTS THE SECOND I STOMP ON THE GAS, AND IT HAS A LOT MORE POWER AND EVEN SOUNDS BETTER TO ME. IT SAVED ABOUT $500.00 BY DOING THE WORK MYSELF. I GIVE YOU ALL THE CREDIT FOR YOUR DIAGNOSING THE PROBLEM, JUST FROM THE SYMPTONS I GAVE YOU OVER THE e MAIL. I WILL USE YOUR WEB SITE AGAIN AND REFER MY FRIENDS. THANKS SO MUCH FOR THE HELP.

TOM WHITTAKERUSA

Just a quick line to tell you how pleased I am to have my brakes working properly after all this time. Your answer was what I needed. I would certainly recommend you highly. God bless!

Rev. Jerry BaysingerHolts Summit, Mo

I recently asked a question about my 2005 dodge ram, and I just wanted to let my Expert know that he hit the nail squarely on the head with his answer. I wanted to thank him again.

GregPittsburgh, PA

Just a quick line to tell you how pleased I am to have my brakes working properly after all this time. Your answer was what I needed. I would certainly recommend you highly. God bless!

JerryHolts Summit, MO

Thank you so much for your answer. My initial estimate was $325; I got it done for $100 - part and labor.

Lynn B.Ormond Beach, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

Meet the Experts:

Don - Mo Lurch

Don - Mo Lurch

Aftermarket & Factory Electronics

527 satisfied customers

Cert. Chrysler Warnty, Heavy Line Mech, Mobile Electronics. Sales, Installation & Repair for 30 years

Chris (aka - Moose)

Chris (aka - Moose)

Technician

483 satisfied customers

16 years of experience

Paul M ASE Master

Paul M ASE Master

ASE Master Tech

118 satisfied customers

ASE Master Tech 20+ Years

Ivan

Ivan

ASE Certified Master Technician

56 satisfied customers

ASE Master Tech w/ 20+ years in the field. Self employed for 9 years. Member of AUTOLAB radio show.

Amedee

Amedee

Chrysler Technician

899 satisfied customers

ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector

Jerry

Jerry

Master Mechanic

696 satisfied customers

ASE Master tech. 30+ years mechanic, shop forman, service manager

Ron

Ron

ASE Certified Technician

373 satisfied customers

#@ years in the Automotive repair field.

< Previous | Next >

Related Chrysler Questions
2007 Pacifica, Battery tests good 12.4V, ground to engine is
2007 Pacifica, Battery tests good 12.4V, ground to engine is good, new battery terminals. Car will turn over weakly then clicks. I tied to jump from other vehicles with the same weak turnover and no s… read more
jim
jim
Vocational, Technical or Trade Scho
702 satisfied customers
Wont start after installing new battery. I cleaned the
I cleaned the terminals and the battery is new today … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,375 satisfied customers
My 3016 Chrysler 300 will not start, battery is fully
My 3016 Chrysler 300 will not start, battery is fully charged and block heater is plugged in … read more
Chris (aka - Moose)
Chris (aka - Moose)
Technician
Vocational, Technical or Trade School
483 satisfied customers
We jump started it and replaced the battery - now it will
we jump started it and replaced the battery - now it will not start - turning the ignition switch has no effect on starter … read more
Mechanic01
Mechanic01
1,645 satisfied customers
I have a 2014 200. the battery ligh is on. no check engine
i have a 2014 200. the battery ligh is on. no check engine light. but my code reader is pulling a charging system high voltage code and a battery high output code. All the dash light will come on and … read more
rpmdiag
rpmdiag
High school
7,267 satisfied customers
Will not charge. New alternator new battery new pigtail at
Will not charge. New alternator new battery new pigtail at alternator … read more
Mechanic01
Mechanic01
1,645 satisfied customers
It will not start, it is not the battery. Battery new, it
It will not start, it is not the battery. Battery new, it clicks, when trying to start, and is pulling juice from battery. Alternator, wanting to know how many hours to replace alternator? … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
It want start or turn over. 2007. Unhook the battery and
It want start or turn over JA: Will the headlights turn on? Is the battery fully charged? Customer: Yes JA: What is the model/year of your Chrysler? Customer: 2007 JA: Are you fixing your vehicle your… read more
Michael Solis
Michael Solis
363 satisfied customers
Battery was completely dead. Starter turns but won't fire
Battery was completely dead . Starter turns but won't fire with a jump … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,393 satisfied customers
The car will not jump start battery drains setting reads
The car will not jump start battery drains setting reads check TPM … read more
Chris (aka - Moose)
Chris (aka - Moose)
Technician
Vocational, Technical or Trade School
483 satisfied customers
Tried to start, sounds like dead battery, but battery is ok.
Tried to start, sounds like dead battery, but battery is ok. Also dash now shows"service park assist system" … read more
BOBBYSS
BOBBYSS
TECHNICIAN/ADVISOR
Associate Degree
8,343 satisfied customers
I just changed the battery but my car cranks but will not
Hi I just changed the battery but my car cranks but will not start … read more
Robert R
Robert R
Auto Technician
Vocational, Technical or Trade Scho
879 satisfied customers
I had my battery replaced and the people that put it in
I had my battery replaced and the people that put it in hooked it up backwards. Then they started my car, my horn, lights, and windshield wipers went crazy. It blew my alternator but I replaced it and… read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
New battery drained overnight to almost nothing. Tested with
Yes tested with meter. It isnt leaking fluid, there must be a parasitic drain … read more
Chris (aka - Moose)
Chris (aka - Moose)
Technician
Vocational, Technical or Trade School
483 satisfied customers
Engine won't turn over clicking new battery fuses all good
Engine won't turn over clicking new battery fuses all good gas in it still won't start ? … read more
Todd M
Todd M
Owner
ASE Certification
1,476 satisfied customers
My wife drove the car to work with the battery light on by
my wife drove the car to work with the battery light on by the time she got there the the abs and trac light was on as well. I drove to her work 30 miles away and checked voltage at battery jump post … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
The engine is shut down and it's not starting... Battery is
The engine is shut down and it's not starting... Battery is good tho … read more
Robert R
Robert R
Auto Technician
Vocational, Technical or Trade Scho
879 satisfied customers
It won't start it not the battery, Engine term but it won't
No I just stopped and parked and came back there started in the term but it won't start I haven't tried nothing yet … read more
Mechanic01
Mechanic01
1,645 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x