Question about 1998 Jeep Cherokee

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Faulty pcm need info on how to install external voltage regulator

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  • genes2000joe Nov 03, 2008

    2002-doge durango. while driving at high speeds engine revs up and down.

  • yadayada
    yadayada May 11, 2010

    external voltage regulator for what system??

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Wha

Posted on Oct 10, 2008

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Where is the voltege regulator in a 1994 f350 7.3


Jorge, You probably have an alternator on that truck,which means the regulator is built into it. Check the attached links,instruction and guides, Good luck

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How to make transmission shift after installing external voltage regulator on 2003 Dodge ram2500 van 5.2 liter eng


Well this didn't come an external regulator. It is built into the PCM. So, my first would be check the transmission/EATX fuse. Next remove the regulator and replace the PCM. Not saying you can't do this, I would have to see schematics and which wires were patched into or removed. Could be you spliced into alternator wires that should have been cut( or vice versa) from the PCM. The regulators of yesteryear are not what they are today.

Mar 05, 2016 | Dodge Cars & Trucks

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I have 2003 Saturn Ion and I have bought a new


test the battery voltage while the engine is running, (you'll have to jump it again)
if you know the battery, voltage regulator and alternator are good, you may have to check all the fuse-able links on the car, all the vehicle grounds, and the fuses and relays.
if you put your battery on charge until it is fully charged and let the car sit over night and it is dead, either the battery is internally shorted or the vehicle is drawing far to much current and each circuit tested to find the short.

Oct 01, 2014 | 2003 Saturn ION

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P0171 - Fuel Trim System Lean Bank 1 and/or DTC P0174 - Fuel Trim System Lean Bank 2


DTC P0171 probable cause:
1. Wire harness problem. Check for correct voltage, opne, short toground, short to voltage
2. Fuel pressure problem. Check pump, regulator, filter and lines
3. Exhaust leaks or restrictions
4. Vacuum hoses. Leaks or incorrect routing
5. Contaminated fuel
6. Sensor improperly installed

DTC P0174 probable cause:
1. Faulty sensor or solenoid
2. Damaged or corroded connector terminal contact
3. Wire harness problem. Check for correct voltage, open, short to ground, short to voltage
4. Control unit software in need of update
5. Faulty PCM or ECM
6. Lean fuel mixture
7. Fuel pressure problem. Check pump, regulator, filter, and lines

Jun 08, 2014 | 2003 Saturn VUE

1 Answer

Have code P1682 on 98 dodge durango. I know it's low voltage detected. I pulled the alternator off and had it tested three times and it shows to be good. Have looked at the wireing and everythi


ck the fuse but this vehicle has a built in voltage regulator in the pcm and you have to either install a different pcm and then have it reflashed for your vehicle or install and external regulator i believe napa sells these as i have replaced quite a few of these in our shop.

Jan 24, 2013 | 1998 Dodge Durango

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

2 Answers

NOT CHARGING CORRECTLY. NEW ALT, BATTERY. CODE SAYING VOLTAGE REGULATOR. THEIR IS NONE, IT'S PART OF THE PCM FROM I'M READING IN THE HAYNES MANUAL


You are misunderstanding the manual. There is a voltage regulator and it is part of the engine computer. When the regulator goes bad, you need to replace the computer. Its a really bad design but that's the way it is!!! There is a "work around" involving bypassing the computer and installing an external regulator but it turns the light on and won't pass inspection that way.

May 31, 2011 | 1993 Jeep Grand Cherokee

2 Answers

Looking for altennator fuse on 2003 ford windstar


check fuses 13 and 20 in the box by the battery.
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May 25, 2011 | Ford Windstar Cars & Trucks

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I need to know how to locate the external regulator for the alternator and where it is


The alternator is reglated by the Powertrain Control Module. (PCM) The PCM is mounted right next to the Power Distribution Center, which is mounted right next to the battery in the engine compartment.

Oct 24, 2009 | 2000 Chrysler Grand Voyager

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