Pcm

Tiny
JENNYSA
  • MEMBER
  • 2004 CHRYSLER GRAND VOYAGER
  • 2.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 15,000 MILES
I Need a picture of the inside of the PCM, it has burn a circuit on the PCB, so we cannot reed the numbers on it.
We will try to put a new circuit on the PCB.
The problem on the car is that it does not sending the correct signals for the ignition so it only starts on two cylinders.
Sorry for My bad English :) Swedish woman :)
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Wednesday, April 5th, 2017 AT 11:13 PM

18 Replies

Tiny
STEVE W.
  • EXPERT
Your English is fine. You would be much better off finding a used PCM and getting it shipped to you. It may not be only the transistor that burned out.

What is burned appears to be a coil driver transistor. It should have a twin to it that controls the other half of the coil pack. Should be able to track it back from the ECM pin it controls, they are pins 9 and 10 in PCM connector two.

Normally in the US we just replace the PCM and send the unit in as a core, or scrap it.
One place that might be able to tell you the part number and even give you better information is a place called United Radio
http://www.unitedradio.com/automotive-electronics/
They repair/rebuild a lot of automotive electronics. They might even have the part number handy.
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Thursday, April 6th, 2017 AT 12:43 AM
Tiny
JENNYSA
  • MEMBER
Thank you very much for the answer, here in Sweden it cost a lot to change the PCM and program it. So we will try to change the broken parts in the PCM instead. :)
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Thursday, April 6th, 2017 AT 1:35 PM
Tiny
CARADIODOC
  • EXPERT
Allow me to add a note. This is going to be a proprietary part with a number that can't be found in any cross reference guide. The best source is to harvest a transistor from another module. These have a very low failure rate, and there is protection built in so wiring problems won't damage driver transistors. Instead, consider the IC to the left. It looks like there is a lot of corrosion between the terminals on the right side. I've tried to repair circuit boards before, but I've never been successful.
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Thursday, April 6th, 2017 AT 7:23 PM
Tiny
JENNYSA
  • MEMBER
The ic has gel on it, that's why it looks like corrosion, we have a pretty good Guy that Will change the parts that is broken, and he manage to check if everything is ok to :) so we Will give it a try, i'm looking for someone that have the same pcm that can Open it up a check the Numbers on the transistor :) thank you for takeing time :)
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Thursday, April 6th, 2017 AT 10:48 PM
Tiny
JENNYSA
  • MEMBER
Just got answer from him that he checked up pin 9 & 10, and 9 is the one that is broken, but number 10 isn't the same Numbers on.
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Thursday, April 6th, 2017 AT 10:54 PM
Tiny
STEVE W.
  • EXPERT
Looking at how they have the coil arranged I'm not surprised. I'll dig around and see if I can find one that used the same parts. Can you give me the info that it is possible to read off the bad chip and the numbers on the board itself please? Also the numbers off the board to the left in your first picture, the gel is hiding a few.
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Friday, April 7th, 2017 AT 3:11 AM
Tiny
CARADIODOC
  • EXPERT
I just posted an answer for someone who replaced the Engine Computer on a 2005 model, AND, ... Since everything always shows up in pairs, I just helped a friend diagnose a computer problem on a 2005 Grand Caravan last week. He's some distance away, but I'll be going there next week. I'll try to find the old computer and see if I can find your numbers.
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+1
Friday, April 7th, 2017 AT 4:55 PM
Tiny
CARADIODOC
  • EXPERT
Just occurred to me that in addition to being a year newer, it had a V-6 engine. Will look for it anyway.
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Friday, April 7th, 2017 AT 4:58 PM
Tiny
JENNYSA
  • MEMBER
A friend called me today and sad that she had a Voyager 2.4, and that it was broken, so it was ok to borrow the pcm. It worked out that it was V6 but I borrowed the pcm anyway, I thought that if it's 4 cylinders on My car, and 6 on hers, it wouldn't be so much different. And it seems like it's the same parts, just one more transistor for the ignition. So I hope the part number for the transistor is the same on My pcm :)
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Friday, April 7th, 2017 AT 5:23 PM
Tiny
KEN
  • ADMIN
Nice work Steve and Randy :)

We are the dream team!
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Sunday, April 9th, 2017 AT 5:52 PM
Tiny
JENNYSA
  • MEMBER
Thank you for trying
The pcm from V6 was not Amy help. So I need to fond a pcm from the 2.4L
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Sunday, April 9th, 2017 AT 10:16 PM
Tiny
STEVE W.
  • EXPERT
Can you give me the info that it is possible to read off the bad chip and the numbers on the board itself please? Also the numbers off the board to the left in your first picture, the gel is hiding a few.
I think the basic board is used in a couple 2.4 applications. That MOSFET should be a simple item to replace.
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Monday, April 10th, 2017 AT 2:08 AM
Tiny
JENNYSA
  • MEMBER
Hello
On the board 04839068AD
CHR087 25-3-023

The Numbers I can se from the broken part is
ST D22317
And the next line MO(R or D or something else) then the bubble is in it's way. The last number at that line is 8.
The Third line I can only see the 2 first numbers it's 04
And the last line 47 and a ring with HRC or MRC then AA.
Thank you very much for helping :)
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Monday, April 10th, 2017 AT 6:52 AM
Tiny
JENNYSA
  • MEMBER
More pictures :)
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Monday, April 10th, 2017 AT 6:53 AM
Tiny
KEN
  • ADMIN
Okay cool, what exactly did you need?

Best, Ken
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Wednesday, April 12th, 2017 AT 6:46 PM
Tiny
JENNYSA
  • MEMBER
We found another Guy that is extremly good in electronic and he put a new transistor on the board yesterday, but the pcm didn't send signals to the one side to the ignition coil, so I still only works on 2 cylinders :( he tryed to find out What is next part after the broken transistor, he Thank something more is burned on the board, but the board is built in 4 layers so he can't manage to find it. So does anybody know about the electronic on the board?
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Wednesday, April 12th, 2017 AT 10:32 PM
Tiny
STEVE W.
  • EXPERT
That is the problem with component repair on these boards. Nobody has a full schematic except the company that makes them and folks who have reverse engineered them during repairs.
Possibly he could trace the working sides trigger signal back to the main chip and see what's in that signal path. It should be the same components as the dead side.
I would expect a smaller transistor being used to trigger the MOSFET he replaced.

Chrysler P04748376AD is the units part number, that turns up quite a few on Ebay.
Chrysler P04748374AC is the software updated version you have. Both are valid numbers. You might buy one and use it as a guide to repair yours.
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Thursday, April 13th, 2017 AT 5:49 AM
Tiny
CARADIODOC
  • EXPERT
I don't know how Steve W. Got so smart, but he's right about the mosfet. That is a totally different type of transistor and can't be replaced with any standard transistor.
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Thursday, April 13th, 2017 AT 6:45 PM

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