WK1 Troubleshooting / Problems Discussion / Dealer ServiceIf 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.
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.
The Dunning–Kruger effect is a cognitive bias in which unskilled people make poor decisions and reach erroneous conclusions, but their incompetence denies them the metacognitive ability to realize their mistakes. The unskilled therefore suffer from illusory superiority, rating their own ability as above average, much higher than it actually is, while the highly skilled underrate their abilities, suffering from illusory inferiority. This leads to the situation in which less competent people rate their own ability higher than more competent people. It also explains why actual competence may weaken self-confidence. Competent individuals falsely assume that others have an equivalent understanding. "Thus, the miscalibration of the incompetent stems from an error about the self, whereas the miscalibration of the highly competent stems from an error about others."
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.
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.
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...
2006 GC SRT 8(email@example.com)-SOLD
2008 F-150 LIMITED #3449 of #5000
2006 TRAILBLAZER SS(SOLD)
2004 REDLINE SSR (SOLD)
1999 SVT F-150 (SOLD)
1987 GRAND NATIONAL (SOLD)
1996 IMPALA SS (SOLD)
1969 MACH-1 390,C-6 (SOLD)
1970 BUICK GSX, APOLLO WHITE (SOLD)
and various others
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