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WK1 Troubleshooting / Problems Discussion / Dealer Service If you are having some problems with your Jeep Grand Cherokee SRT8 and need assistance in troubleshooting and diagnosing the problem, this is the proper place to discuss it. Were you treated fairly or poorly at a dealer? Warranty issues? Let us know.

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Old 05-22-2007, 07:18 PM
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Ultimate Prowertrain Control Module thread and my problems.

Ok folks this is my problem and my search for a plan or fix.
Everytime I drive by a high powered Microwave tower, television station transmission tower, or during periods ofextreme solar dust storms, or days of high sunspot activity or Jupiter aligns with Mars.......... my 2007 Jeep Grand Cherokee SRT8 Powertrain Control module takes a fit and I have a runaway engine.

This could and can be a very serious safety problem, and because I think this issue needs my personal attention I am determined to get to the bottom of it.

Some of you may just say take it to the dealer....... well I could but because there are laws to protect me to work on my own vehicle I choose to do it my way.

Some of the things you will see here are not what some people want you too (you can figure out who for yourselves)

I have tried to contact some people from other Forums about my plans but no one who really has the inside know how, have not PM'ed me back, so on this board I will post and continue.

Ok with that all out of the way here's the plan.

I will build a fully complimented vehicle wiring harness based off my 2007 GCSRT8 model with most all of the nodes laid out and connected. I will then add 12 volts regulated power and using a laptop connected to a new Starmobile then with another PC running Vehicle Spy 3 listen into the C can bus and copy the messages sent. Another PC running a Osciliscope program will monitor various nodes I have selected.

I will then try to corrupt the Can bus data using a Magnatron from Microwave oven. HAHAHAHA

Ok so this is the PCM that I will use, a generic unit purchased last week



This is the circut board underneath the cover with the Silicon removed.



Notice this large chip in the midde it is a Freescale (Motorola based) MPC


It's basically the brains behind the PCM routing can codes and sequincing all the variables.

http://www.freescale.com/webapp/sear...Controllers%2F


As most of you folks that have changed out your PCM's there are only 3 connectors identified by Black/Black, Black/Orange and Black/Natural. The fouth location is blank (colored Geen) and that would be for the TCM part if this was a regular 5.7 WK model.


Some links to the various software, cables.
http://intrepidcs.com/modules/CmodsD...s/ValueCAN.pdf

http://www.intrepidcs.com/catalog/index.php

http://www.intrepidsupport.com/

http://www.kvaser.com/index.htm

http://www.dontronics-shop.com/produ...1&cat=0&page=1

So here I start and end for today, if you folks have any suggestions please bring 'em on. This project may take a few months so hang in there (I gotta work too).

Till tomorrow, where you get to see the back of the PCM board and we start identifying the various sections of the board. (Microcontrollers, coil circuts etc,)

Jeff
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Old 05-22-2007, 07:56 PM
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You're nuts.
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Old 05-22-2007, 08:07 PM
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yeah, I was following ya up until this....

"I will then try to corrupt the Can bus data using a Magnatron from Microwave oven. HAHAHAHA"
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Old 05-22-2007, 08:24 PM
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I'd keep this secret, you know DCX will come knocking on your door sometime by 7am tomorrow
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Old 05-22-2007, 08:29 PM
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Quote:
Originally Posted by Razorecko
I'd keep this secret, you know DCX will come knocking on your door sometime by 7am tomorrow
I understood every word you said in that post...................
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Old 05-22-2007, 08:51 PM
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If you can crack this B1TCH you will be loaded. It needs to be dyno programmable.

And who cares about DCX they were sold! Work your magic as we sit chomping at the bit!!!
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Old 05-22-2007, 08:52 PM
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Jeff ,keep up the great R&D

b
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Old 05-22-2007, 09:03 PM
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Friggin Hilarious BUT.... I see the seriousness in you post.

(Why do I get the feeling that the next picture we see will be that of an un-soldered PC board )

Kudos on the task at hand............
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Old 05-22-2007, 10:58 PM
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Good luck Blown!
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Old 05-23-2007, 03:35 AM
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Quote:
Originally Posted by FastSRT8GC
If you can crack this B1TCH you will be loaded. It needs to be dyno programmable.

And who cares about DCX they were sold! Work your magic as we sit chomping at the bit!!!
Oh I think it will be cracked, however unlike other attempts by others in the past all information will be posted here and not lost, kind of like a open source post. I'm not doing this for money I could care less, my business repairing and altering aircraft is very good.

Like I said Solar Flare Radiation is affecting my PCM and I'm just trying to fix it, (thats my story and I'm sticking to it.

Jeff
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