Jeep Grand Cherokee: Battery Not Charging After Replacing The Alternator, Code P0622 - Diag & Repair

[@DTC.Motors.Center]

All I can say is YOU’RE THE MAN OF THIS LAND AND THIS PROFESSION, Thank you so much for the share great Dale

[@KITS_Auto_and_Truck_Repair]

@DTC.Motors.Center Thank you!!

[@billcogswell]

One of the best videos i’ve seen in along time. Thanks for the follow up after repairs and repair verification.

[@KITS_Auto_and_Truck_Repair]

@billcogswell Thank you!

[@rbilardo47]

Another awesome and true diagnosis. Love how you explain what and why you are doing the things being done. Love your videos, keep them coming.

[@KITS_Auto_and_Truck_Repair]

@rbilardo47 Thank you!

[@edcunion]

This is one of the best charging system troubleshooting videos on KZbin. This can be a guide also for Honda & Acura vehicles, particularly the late 2000s era RL and Accord models, that had charging system failure issues, either from the PCM or engine bay fuse box ELD.

[@KITS_Auto_and_Truck_Repair]

@edcunion Thank you!

[@ryangray6916]

Great video! I really like your style of teaching and showing what your doing the same time. The reason that I watched is because my buddy is having the exact same issue with their Cherokee, they have replaced the alternator twice and the battery is still dying after a few days. After the first replacement, they thought that they had replaced the alternator with the wrong type. After the second one failing, the shop is bewildered and probably has not done the diagnostic tests that you just performed. I can never say that this fix will be their same fix, but at least it will give us a few more ideas of what tests to run. If this video helps him fix the problem, I will make him donate to the channel!!!

[@KITS_Auto_and_Truck_Repair]

@ryangray6916 Thank you Sir! I appreciate it!

[@sulemanhabib1743]

K Diagnostic u are always the best in Diagnostic and fixing,thanks you. we are in bad network here,is difficult to download videos

[@KITS_Auto_and_Truck_Repair]

HABIB AUTO DIAGNOSTIC Oh I'm sorry to hear that! Thanks

[@youssefzegari1618]

As a student in diagnostic and repair cars i want to thank you for sharing this valuable information.

[@KITS_Auto_and_Truck_Repair]

Youssef Zegari My Pleasure!

[@abzbrk490]

Hi great diagnostics but I have a question. All your steps was spot on and my question is when the old alternator when bad what i know sometimes the PCM will shut down the driver for the alternator in the PCM to protect its self. did you clear the codes before condemning the PCM after replacing the alternator.

[@kevincampos6884]

Muchas gracias por tomarte el tiempo de hacer este video!!! es justo lo que buscaba, necesitaba una referencia de la signal con osciloscoio. Muchas gracias amigo.

[@KITS_Auto_and_Truck_Repair]

@kevincampos6884 My Pleasure!

[@robertgerlach9439]

nice job explaining the pcm controlled charging system. thanks for sharing...

[@KITS_Auto_and_Truck_Repair]

@robertgerlach9439 My Pleasure! Thanks

[@buboybebing3716]

goodevening my friend,,another nice vedio my friend,,thanks for uploading.

[@KITS_Auto_and_Truck_Repair]

buboy bebing My Pleasure!

[@snowdragon930]

I AM SUBSCRIBING RIGHT NOW! I know talent when I see it. I am impressed and inspired by you.

[@KITS_Auto_and_Truck_Repair]

@snowdragon930 Thank you! I appreciate it and welcome to our youtube community!

[@wernerostwald287]

This video had a few minors wording mistakes....however it is an EXCELLANT video for helping diagnosing charging issues.

[@KITS_Auto_and_Truck_Repair]

@wernerostwald287 what words?

[@wernerostwald287]

I would have to view it again to capture everything but it doesn't matter, because they don't prevent viewers from diagnosing alternators properly with this great video. One that I do remember is that the meter leads are actually connected in parallel (not in series) with the power wire during the voltage drop tests. Keep up the good work.

[@zio2485]

Excellent troubleshooting of charging system.

[@KITS_Auto_and_Truck_Repair]

@zio2485 Thank you!

[@elgarfio4186]

🎉🎉great video, I wouldn't never think that the problem was with the car computer! Good job!

[@KITS_Auto_and_Truck_Repair]

El Garfio Thank you!

[@elgarfio4186]

@@KITS_Auto_and_Truck_Repair no, thank you for taking the time to share your experience with us, God bless you!!

[@KITS_Auto_and_Truck_Repair]

@@elgarfio4186 Thanks!

[@rick343]

They wasted money buying a alternator, that's too bad, they could of used it towards a new computer, I was thinking it was going to be a bad new alternator, been getting a lot of bad new parts, I know it's not easy to call the computer and you want to make sure you are right, I think you nailed it, great job as always 😊

[@KITS_Auto_and_Truck_Repair]

Rick Thanks my friend! I've been getting a lot of bad parts out of the box too! I actually have a video coming out soon on a VW where the new part was causing more issues, I can't wait to share it with you all!

[@ladeishawilliams7735]

Awesome video and Congrats on 30k subscribers!!! 🎉

[@KITS_Auto_and_Truck_Repair]

Ladeisha Williams Thank you! I appreciate it!

[@sodiagnosisandprogramming5139]

Thanks for the lecture. Pls hw do I get this software for the wiring diagram or does it come with diagnosis machine

[@KITS_Auto_and_Truck_Repair]

SO Diagnosis and Programming My Pleasure! You can get these wiring diagrams from Mitchell prodemand!

[@sheerwillsurvival2064]

Putting a test light on pulse wire and use scan tool to activate circuit. If computer is working it will flash test light when you command it on scan tool. 👍🏻👊🏻 you still got it done same same. I always put a little liquid tape on all test punctures 👊🏻

[@KITS_Auto_and_Truck_Repair]

@sheerwillsurvival2064 Thank you!

[@chris847712]

Thanks. This just got me out of a jam

[@KITS_Auto_and_Truck_Repair]

@chris847712 My Pleasure!

[@VashthStampeede]

A better way to test the field circuit would be to momentarily ground the dark green wire at your test point and look for voltage increase at the B+ at the battery. If voltage increased, repeat the test as close to the PCM as possible. If the voltage increases again, it ensures the integrity of the dark green wire. If the connector pins and sockets are ok and the PCM grounds are good, then PCM replacement is the solution.

[@KITS_Auto_and_Truck_Repair]

VashthStampeede Thanks for your input!

[@LubaLuba1]

Thanks I will try this today

[@myviews469]

Just grounded the brown field wire / the one with no voltage and I did not get any increase at the battery. checked between red and brown field wires and got 8.89v and between red field wire and battery negative and got 8.9v. The battery reading is 12.5v Do we know if the voltage field from PCM should be 8.9v? and would this amount be enough?

[@myviews469]

The two I have from PCM red and brown, and the red give me 8.8v when the key is on position, brown is zero. but just spliced into brown and attached ground, while motor was on, I am tapping the ground to negative post on battery but no increase in voltage. And this alternator is brand new installed yesterday.

[@wernerostwald287]

I think that the 8.9v you measured with a volt meter is the average DC voltage of the PWM signal. Note that the PWM signal rises and falls at various duty cycles.@@myviews469

[@tnamen1307]

Simple for yellow wire. 12 V feedback on the yellow wire means ALTERNATOR is not charging. 0 V feedback signal means ALTERNATOR is charging properly.

[@KITS_Auto_and_Truck_Repair]

@tnamen1307 Good!

[@bernardocisneros4402]

In my opinion, putting the voltage regulator inside the PCM is a terrible idea. You shouldn't have to change a PCM for a charging issue. They should have a charging module between the PCM and alternator.

[@KITS_Auto_and_Truck_Repair]

@bernardocisneros4402 I agree with you!!

[@jtbuilds9176]

You can wire in a aftermarket voltage regulator and bypass the pcm regulated system. Personally I am about to install an adjustable voltage regulator on my jeep because I need a little higher charge voltage from my 340 amp alternator I just installed today. (Edited because I suck at typing and English and memory)

[@dabrte]

Excellent 👍👍I don't have your scope but I do have a volt/ohm meter. Is there a way to connect an external voltage regulator? Not charging is my only pcm issue...it would be cheaper

[@KITS_Auto_and_Truck_Repair]

@dabrte I'm not sure if connecting an external voltage regulator would work!

[@drewmann1966]

So the control wire is pwm and the grounding of that wire will trigger charging of the alternator. Could jumping that wire to ground and trigger charging additionally validate lack of control of the pcm?

[@KITS_Auto_and_Truck_Repair]

@drewmann1966 Yes!

[@serdardilekli5135]

thanks for the video.i think i have the same problem on my chrysler sebring 2.7 2nd gen.battery light is on.generator is ok.cables are ok.in addition to code p0622 car has more codes p0420 p0174 p0032 p0038 p0052 p0058.do you think my car has a bad pcm?should i check the power and the gorund of pcm?thank you

[@KITS_Auto_and_Truck_Repair]

@serdardilekli5135 Yes! check the PCM

[@JeanBigord]

If you replace the ECM the ecm need to programming?

[@KITS_Auto_and_Truck_Repair]

@JeanBigord I think this ECM Came programmed already!

[@DependableAutoTruck]

the field wire gets grounded by pcm for charging the low voltage on field shows its charging or it would be higher. the pulse is it going to ground when fully charged the pulse will be really short

[@KITS_Auto_and_Truck_Repair]

Dependable Auto Truck Ah Ok, Thanks for your input

[@alexanderstefanxandraswedi5835]

❤😊 great presentation brother after then I can understand more and more every your posted videoes 🎉

[@KITS_Auto_and_Truck_Repair]

Alexander Stefanxandra Swedish Thank you!

[@eduardoacostasanchez2865]

do you have to reprogram the ecm? or is it just taking off and putting on?

[@KITS_Auto_and_Truck_Repair]

@eduardoacostasanchez2865 No! Just plug and Play!

[@LubaLuba1]

Hi, It seems like I have the same problem can you tell me where Bishop got his ECM. Thanks so much Duo great video!

[@KITS_Auto_and_Truck_Repair]

@LubaLuba1 Thank you! you can get this ECM, From a company called Auto ECMs!!

[@ghostme1635]

Could it be a faulty battery current sensor...In other cases ?

[@KITS_Auto_and_Truck_Repair]

@ghostme1635 No!

[@ghostme1635]

@@KITS_Auto_and_Truck_Repair thanks

[@Franklinveterinarycenter1of4]

Dark green wire vs. green with orange...which one did you connect the yellow lead to with the ground wire going to battery ground and ECM or does it matter? PWM was Green with orange and the other wire from ECM green.

[@KITS_Auto_and_Truck_Repair]

South Wind Sorry! i didn't understand your question!

[@VashthStampeede]

The dark green wire is the field control wire. The alternator sends voltage to the EVR in the PCM on this wire and the EVR pulses that voltage to ground in the PCM to control the output voltage to the battery. The green with orange stripe wire sends feedback to the PCM. Since voltage comes from the alternator and goes to the PCM to be grounded, unplugging at the alternator is not a good test for the circuit on the dark green wire. Therefore, PCM replacement at that point was a lucky guess. It could just as well have been a break in the dark green wire between the alternator and the PCM.

[@renemata4350]

Exelent diagnosis and very good tests to condemn computer thanks for sharing your knowledge blessing

[@KITS_Auto_and_Truck_Repair]

Rene Mata My Pleasure! Thanks

[@robertomijango6207]

great informetion too learn this system thank you for you time sharing all you experience

[@KITS_Auto_and_Truck_Repair]

Roberto Mijango My Pleasure!

[@beau0718]

Do you have to program the computer?

[@KITS_Auto_and_Truck_Repair]

@beau0718 Yes! this one came programmed

[@sandrahill5931]

Deo, what multi-meter was used in the video? Does any test lead work or do I need to use alligator clip test lead? Thanks, Deacon

[@KITS_Auto_and_Truck_Repair]

@sandrahill5931 you can use any test leads from a multi-meter!

[@sandrahill5931]

@@KITS_Auto_and_Truck_Repair Thanks. Is that a snap-on multi-meter being used in the video? Thanks, Deacon Hill

[@KITS_Auto_and_Truck_Repair]

@@sandrahill5931 My Pleasure! NO it's not a snapon multi-meter

[@CumminsDriver]

Excellent video and explanation 👍

[@KITS_Auto_and_Truck_Repair]

@CumminsDriver Thank you!

[@vlstyles]

Did you consider an external voltage regulator since the PCM in the Jeeps are so prone to failure?

[@KITS_Auto_and_Truck_Repair]

Varian Styles No! The PCM was pretty cheap!

[@jdawg2474]

Will an external voltage regulator fix this issue?

[@vlstyles]

@@jdawg2474 Yes, the kit will take the job of voltage regulation from the PCM.

[@jdawg2474]

​@vlstyles I'm having a similar issue. Brand new alternator and brand new battery but I'm still getting a battery light and the code p0622. But the voltage when it's cranked is about 14.2 with my multimeter. My vehicle doesn't have a visible battery guage.

[@vlstyles]

@@jdawg2474 Do you have a Jeep? Jeeps generally charge lower than most cars, especially the older ones. In fact, they complain with a check gauges light if the voltage is above 14.5.

[@1PaJoe]

Just a thought - I notice your buddy had his sleeve very close to the rotating pulley of the alternator - if the pulley ever grabbed his arm sleeve he could really get hurt -

[@KITS_Auto_and_Truck_Repair]

@1PaJoe Yeah! Thanks

[@Franklinveterinarycenter1of4]

Blue red wire, not green orange wire; sorry, very confusing. I should have reviewed before I posted the question. Please disregard and thankyou for your awesome video presentation!!!!

[@KITS_Auto_and_Truck_Repair]

South Wind My Pleasure!

[@bernardocisneros4402]

@hypocrisyrules You're not wrong. He pulled up 2 different schematics and they had different colored wires for the "source" wire. The schematics were probably for the same Jeep but different engine sizes. On one it was a light blue wire with a red stripe and on the other it was dark green wire with an orange stripe.

[@myviews469]

I think I have same problem but I only have a multi meter is it possible to check the two field wires one is red other is brown but only one reads 12.3 volts. I have 2011 town and country can I use voltage regulator kit ? Researching for a couple of months and tried all other suggestions from mechanics on KZbin still not charging. new battery and two alternator still nothing. I have run out of ideas.

[@KITS_Auto_and_Truck_Repair]

@myviews469 your problem might be a bad ECM or a wiring problem, I recommend you take it to a pro mechanic who can diagnose it for you!

[@myviews469]

@@KITS_Auto_and_Truck_Repair i would definitely feel confident taking it to you if you were close by But here’s what I checked so far. kzbin.info/www/bejne/j2XId5WMhaygbZIfeature=shared

[@myviews469]

@@KITS_Auto_and_Truck_Repair I like to know the new alternator is good, is there a way to test it out can I connect a voltage regulator kit to it to see if it gives charging power ?

[@KITS_Auto_and_Truck_Repair]

@@myviews469 you can ground the control wire that comes from the ECM, if the voltage goes up at the battery then the Alternator is good! ground the wire that doesn't have voltage on it!

[@myviews469]

Just grounded the brown field wire / the one with no voltage and I did not get any increase at the battery. checked between red and brown field wires and got 8.89v and between red field wire and battery negative and got 8.9v. The battery reading is 12.5v Do we know if the voltage field from PCM should be 8.9v? and would this amount be enough?

[@DependableAutoTruck]

if you ground the field wire will charge fully another way to check alternator

[@MacAutoDiag]

Is the field wire the wire with 12v on it or the wire that the pulse with is on?

[@DependableAutoTruck]

@@MacAutoDiag the plugin terminal that has the 12 volts gets grounded the pulse wire is the signal.

[@MacAutoDiag]

@@DependableAutoTruck so if I ground the 12v wire it'll charge fully and testing that won't short the PCM or anything correct

[@DependableAutoTruck]

you unplug the 2 wire connector from back of alternator and ground the field wire and alternator will if good put out all it is able to do . dont ground for long just for testing. hook up volt meter to the bolt on wire on back of alternator from battery check voltage then ground field and watch voltage climb if it doesn't climb alternator is bad. you should have at least battery voltage on the bolt on wire on back of alternator

[@KITS_Auto_and_Truck_Repair]

Dependable Auto Truck I appreciate you for answering the question!

[@mohammadal-gebaly3046]

Very good job my friend , thank you so much

[@KITS_Auto_and_Truck_Repair]

Mohammad Al-Gebaly My Pleasure! Thanks my friend

[@hectorvega2163]

Great video and very helpful one. Thanks.

[@KITS_Auto_and_Truck_Repair]

@hectorvega2163 My Pleasure!

[@GabrielEbenezer-b2s]

After replacing the ECU did you have to program the car for it to start or the ECU is a free code ECU ??

[@KITS_Auto_and_Truck_Repair]

@user-dw7jv9zi1d the ECU was programmed!

[@DuaneDonaldson]

You did not mention programming the ECM there in the shop or if you ordered it preprogrammed based on the vehicle VIN and other info THUMBS UP.

[@KITS_Auto_and_Truck_Repair]

Duane Donaldson it came preprogrammed just plug and play!

[@wsnxumalo6707]

Ever fixing any diagnose. South Africa

[@KITS_Auto_and_Truck_Repair]

@wsnxumalo6707 Thanks my Friend

[@cmigueltorena]

Ecm or pcm?? Which one did he changed?

[@KITS_Auto_and_Truck_Repair]

@cmigueltorena ECM!

[@JeanBigord]

Hi the ECM need programming

[@KITS_Auto_and_Truck_Repair]

@JeanBigord No1 just plug and play!

[@BrownSugar_Vita]

Going through this charging issue it's not the alternator, shop said it's the PCM. Got a PCM Still saying charging error code. Could it be the battery?

[@KITS_Auto_and_Truck_Repair]

@MzHoney981 you might have a wiring problem and make sure your alternator is a good quality Alternator!

[@BrownSugar_Vita]

@@KITS_Auto_and_Truck_Repair bought it brand new with a 3yr warranty. Where should we start with the wiring? Initially thought it was a tension belt because the power steering started acting up then the ac it was driving on day then cut off. Won't start, won't take a jump at all. basically no power.

[@jahimmfundombombi7653]

great video guys

[@KITS_Auto_and_Truck_Repair]

@jahimmfundombombi7653 Thank you!

[@konezoumana614]

Thanks for this video.💪💪💪

[@KITS_Auto_and_Truck_Repair]

Koné Zoumana My Pleasure!

[@brushrescue1701]

awesome ....new subscriber....😁👍

[@KITS_Auto_and_Truck_Repair]

@brushrescue1701 Thanks, welcome to our youtube community

[@martinarrieta248]

Grasias

[@KITS_Auto_and_Truck_Repair]

Martin Arrieta My Pleasure!

[@youssefzegari1618]

Great job 👏🏻👏🏻👏🏻👏🏻👏🏻👍👍👍

[@KITS_Auto_and_Truck_Repair]

Youssef Zegari Thank you!

[@DanielClark-sb5ub]

Why can't you put an alternator with a internal voltage regulator instead of relying on the PCM to control voltage?

[@KITS_Auto_and_Truck_Repair]

@DanielClark-sb5ub that's a good question for the engineer who designed this system

[@DOS_SERVICE]

Brother, can you get me a computer for 21 years 3.6 with firmware?

[@KITS_Auto_and_Truck_Repair]

@DOS_SERVICE I don't think I can get that!

[@DOS_SERVICE]

@@KITS_Auto_and_Truck_Repair please inquire

[@LifeSavingDefense]

On a dodge ram the pcm grounds the generator the transmission and leak detector pump on the same ground. I don't know if it's the same on the jeep but I'm almost certain the engineers were smoking weed when they designed this concept

[@KITS_Auto_and_Truck_Repair]

@LifeSavingDefense Lol!! These engineers do crazy things sometimes!

[@motologist1917]

brother my alternator is not charging the battery whenever i turn the car ON but it charges when i press the throttle all the way to 5000rpm , can anybody help me

[@KITS_Auto_and_Truck_Repair]

@motologist1917 make sure your belt is tight and the alternator is in good shape!

[@motologist1917]

@@KITS_Auto_and_Truck_Repair but when i rev just once it starts charging

[@Money98lol]

@@motologist1917I’m having the same problem on my Challanger

[@motologist1917]

@@Money98lol oh i m happy & sad at the same time that someone is facing the same prblm & can understand mine tooo , btw i have a ford fiesta 1.4 diesel , so do u think its the belt that is not rotating the alternator

[@Money98lol]

@@motologist1917 Negative I even change the belt

[@MikeHurst-be7bz]

Great videos.

[@KITS_Auto_and_Truck_Repair]

@MikeHurst-be7bz Thank you!

[@gdcskates]

awesome bro. thanks

[@KITS_Auto_and_Truck_Repair]

@gdcskates My Pleasure! Thanks

[@abdalgadermohamed5636]

great

[@KITS_Auto_and_Truck_Repair]

@abdalgadermohamed5636 Thank you!

[@laragreene8328]

I DIDNT know the pcm went bad so fast. It doesn't look like a old car.

[@KITS_Auto_and_Truck_Repair]

@laragreene8328 PCM Fail very often, depending on the make and model!

[@engineerhussien2692]

Good job 😊

[@KITS_Auto_and_Truck_Repair]

Engineer Hussien Thank you!

[@svhebert]

👉 K Diagnostics and SleeperDude My two best KZbin channel ever !

[@KITS_Auto_and_Truck_Repair]

svhebert Thank you!

[@humbertoarellano8887]

Good video

[@KITS_Auto_and_Truck_Repair]

@humbertoarellano8887 Thank you!

[@roseharris456]

Alternative fuels

[@KITS_Auto_and_Truck_Repair]

@roseharris456 Good!

[@donaldnye2890]

Check, never buy a jeep. just kidding, very good diagnostics.

[@KITS_Auto_and_Truck_Repair]

Donald Nye Lol! Thanks

[@thomasshannon9662]

This is a stupid design. It's like every now the drivers are in the ECM and if one component goes bad you're replacing the entire ECM $$$$. ridiculous.

[@KITS_Auto_and_Truck_Repair]

@thomasshannon9662 Yes!

[@dennisnewby1641]

Good Job but one thing you didn't say if you have to program the computer I think you shud tell us hood be nice

[@KITS_Auto_and_Truck_Repair]

@dennisnewby1641 Thank you, watch part 2 of this video