Tip & How-To about Chrysler Town & Country

Charging system,late model Chrysler vehicles

2000 year and newer chrysler products put the voltage regulator in the PCM. If the regulator fails the replacement ECM is about 800.00
An earlier ,say 1987,electronic firewall mounted regulator( 2wire) can be simply wired in for about 20 bucks.
One alternator fld terminal to the new regulator,the other fld lead to the center terminal of the regulator ,this fld wire must also be tied into ign.+
Be sure not to apply ign. voltage to the right side terminal or you will fry the regulator.

Posted by on

Cars & Trucks Logo

Related Topics:

Related Questions:

1 Answer

2007 saturn vue hybrid system not charging 2.4


Did you test the electrical circuit's ? Have a scan tool hooked up ? Did you have a qualified repair shop check it out ?
When the engine is running, the generator control signal is sent to the generator from the engine control module (ECM)/powertrain control module (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 B+ voltage that is Hot At All Times through the ECM/TCM fuse in the underhood junction block. This voltage is used by the regulator as the reference for system voltage control.
This vehicle uses Class II and controller area network (CAN) communications. The ECM/PCM are CAN and the body controller systems are Class II. The body control module (BCM) acts as the gateway between the different communication protocols. The ECM/PCM requests the battery lamp on the CAN communication line and then the BCM sends a request to the IPC for lamp illumination.
The ECM/PCM will request the battery lamp on under the following conditions:
• The ECM/PCM interprets the ignition is in the accessory position.
• The ECM/PCM is in the RUN power mode with the engine not running.
• Generator L terminal fault has been detected.
• Generator F terminal fault has been detected.
If the generator is not charging, it pulls the F terminal low causing an F terminal fault. Low voltage threshold is 10.5 volts for 4 minutes and engine at least 1,300 RPM. High threshold is 18 volts for 5 minutes.


https://www.motor.com/magazinepdfs/042010_09.pdf

Do you know what DTC'S diagnostic trouble codes are ?
DTC B1325
DTC B1327
DTC B1328
DTC P0562
DTC P0563
DTC P0615
DTC P0621
DTC P0622
These are all for the charging system .

Oct 19, 2017 | Saturn Cars & Trucks

2 Answers

Voltage problem.


the problem is in the voltage regulator
maximum voltage is controlled at 14.5 to 14.8 volts depending on whether the voltage regulator is in the ECM or not
but 14.8 would be max allowed any higher can damage the electronics of the vehicle including the ECM
take it to an accredited auto electrician, have it test and adjusted or the regulator replaced

Nov 25, 2015 | Buick Rendezvous Cars & Trucks

2 Answers

2000 Chrysler cirrus 2.4. Idle in neutral drive in reverse but cuts off when put in drive?? Why what do I got to do to fix this?


The most common cause of this is a bad ground to the ECM. When the car is in any gear other than a forward gear, the ECM is not monitoring the emissions. When you put it in drive it does and when there is a bad ground all the return voltages from the sensors are wrong because they are grounded and the ECM is trying to pull ground through them.

May 03, 2015 | Chrysler Cars & Trucks

1 Answer

Code P0621


P0621 Generator Lamp/L Terminal Circuit Malfunction,,The Engine Control Module (ECM) or Powertrain Control Module (PCM) uses the generator turn on signal circuit to control the load of the generator on the engine. A high side driver in the ECM/PCM applies a voltage to the voltage regulator. This signals the voltage regulator to turn the field circuit ON and OFF. The ECM/PCM monitors the state of the generator turn on signal circuit. The ECM/PCM should detect low voltage on generator turn on signal circuit when the ignition is ON and the engine is OFF, or when the charging system malfunctions. With the engine running, the ECM/PCM should detect high voltage on the generator turn on signal circuit. The ECM/PCM performs Ignition ON and RUN tests to determine the status of the generator turn on signal circuit.

Aug 27, 2011 | Pontiac Grand Am Cars & Trucks

1 Answer

i have a 93 jeep grand cherokee changed altenator but still wont charge


If no damaged wiring is found, it's most likely an internal fault in the ECM (Engine control module, computer, PCM, ECU, whatever you want to call it, it goes by many names)
The Voltage Regulator is built into the ECM on virtually every Chrysler product (including Jeeps) after 1987 or so. And it is prone to failure. If it does fail, you either have to replace the ECM or install an External Chrysler Voltage Regulator, which requires some wiring harness modifications and a few parts that can be purchased at your favorite auto parts store.
To do the External conversion, you'll need :
1 Chrysler Voltage Regulator (virtually any Dodge/Plymouth from 1970 - 1986. It's best to order one for a 70's 4x4 Truck with a 318 engine though, to avoid any possible mix ups)
1 Chrysler Voltage Regulator Pigtail (this is the plug that connects to the regulator)
Roughly 10 feet of 14 gauge wire, possibly less, depending on where you want to mount the regulator.
Most, if not all Regulators now include a wiring diagram in the box, for this purpose, just follow the diagram and match up the field wires on the alternator with the ones in the diagram. On a '93 Jeep one field wire should be Blue, the other should be Green.

Aug 23, 2011 | Jeep Grand Cherokee Cars & Trucks

Not finding what you are looking for?

1,787 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Chrysler Experts

yadayada
yadayada

Level 3 Expert

80339 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

chargerhp
chargerhp

Level 3 Expert

814 Answers

Are you a Chrysler Expert? Answer questions, earn points and help others

Answer questions

Loading...