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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 05-23-2007, 03:46 AM
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So on the next to step my engine harness arrived yesterday. One of the problems with figuring this all out is because the parts department is all on computer you don't know what circuts are on what harness until you order the harness and sort it out. Here is the engine harness and the part number the parts manager didn't know what is on what harness so I have to order piece meal till I get all that I need.


And the part number


After the bag was opened and a few things sorted you can see that the engine harness has only two of the three PCM connectors. So now I have to order what is called the headlight harness.


Jeff
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  #12  
Old 05-23-2007, 03:48 AM
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Here's a pick of the board and harness


Jeff
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  #13  
Old 05-23-2007, 04:00 AM
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And so it begins unwrapping the harness to find each circuit. I never realised how may "wrapped pairs" there are. A wrapped pair means, that particular circuit is subject to stray EMF. I knew the Can Bus was and the Crankshaft Position Sensor is as well as the Camshaft Position Sensor, but a surprise was the Knock Sensors are. So what does that mean? The knock sensors are also subject to stray EMF and also I think by disconnecting the knock sensors at the block you will in effect turn off the knock sensors.
It doesn't look like the knock sensor circut is monitored by the PCM. A wrapped pair can be seen in the lower left of the pick. Notice the two wires twisted (white and brown)coming off the PCM connector, laying on the manual and separated from the bundle, that is one of the two knock sensor circuts.




Jeff

Last edited by Blown7; 05-23-2007 at 04:35 AM.
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  #14  
Old 05-23-2007, 04:25 AM
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One last thought before I head out the door. There are many ways to get a complete tune out of these vehicles. Piggyback, parallel, or you go right into the PCM and change the parameters and maps. I hope through all this information all the answers will be addressed.


Jeff
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Old 05-23-2007, 07:42 AM
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Good luck, you are nutz !

Seriously, as far as DCX is concerned, check out the LX Forums and type in the search word "Morpheus".

DCX was not amused, and Project Morpheus is dead.

Talk about killing the aftermarket; Ford and Chevy are more than happy to let the aftermarket have it on their rides, it's part of what sells their cars. They're "tune-ability" and DCX lack thereof has definitely put some people off, myself included...

Keep us posted...I think!

Later,

Matty
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  #16  
Old 05-23-2007, 08:16 AM
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Good Luck!! The Force is with ya!!
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Old 05-23-2007, 08:47 AM
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Thumbs up

Wow! Lofty goals. Even with a fast PC this is going to take some time. To bad we couldn't do some distributed networking ala "Folding @ Home", I'd donate my compters CPU for this.

Ronin is right about Project Morpheus. I'd start looking into that ASAP...might save you some time/money/pain...

Either way *thumbs up* and keep us informed. I like watching projects like this.
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Old 05-23-2007, 11:09 AM
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Another thread that I can add no value to. Good luck! This would be great if you can do it.
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  #19  
Old 05-23-2007, 04:13 PM
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STOP WHERE YOUR AT.. ..... DO NOT WORK ANY MORE ON THIS!!!!!

I figured out the problems.... MADE IN MEXICO!!! I will get on this, I own a landscape company and I will ask my workers to fix it!!! Send it my way. Dont worry i have their papers!!
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  #20  
Old 05-23-2007, 05:08 PM
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Quote:
Originally Posted by Ronin
Good luck, you are nutz !

Seriously, as far as DCX is concerned, check out the LX Forums and type in the search word "Morpheus".

DCX was not amused, and Project Morpheus is dead.
I did that, I have spent weeks reading everything.

Can Hack also.

This is different, I have a Gamma Ray Radiation problem affecting my PCM and Can Bus.


Jeff
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