I own a JEEP Grand Cherokee. What do I need to start tuning this

[TurboTBSS]

I have LOTS of Dodge, Jeep and Chrysler parts manuals. Pretty much everything Daimler has released since the 80's. You are more than welcome to them all. Just drop me an email at info at alljeep dot com. They are all PDF's. In my experience, they don't change part numbers unless the item changes - not the application.

Now I'm looking at the 04 Jeep Wrangler, and there are 11 different PCM's for this year alone, or 6 for US emissions alone. 2 are for the Rubicon, so that leaves 4 for the other Wranglers. And I don't see where any of these transfer to any other rig, but the 04 Jeep Wrangler.

56044419AC - 56044419AD - 4.0L Manual Rubicon
56044421AC - 56044421AD - Export
56044422AC - 56044422AD - Export
56044433AC - 56044433AD - 4.0L Auto Rubicon
56044434AA - 56044434AB - Export
56044447AC - 56044447AD - Export
56044452AC - 56044452AD - Export
56044455AC - 56044455AD - 2.4L Manual Wrangler
56044473AC - 56044473AD - Export
56044474AC - 56044474AD - 2.4L Auto Wrangler
56044477AC - 56044477AD - 4.0L Manual Wrangler
56044478AC - 56044478AD - 4.0L Auto Wrangler

So it looks like the one year would have 6 different computers. Depending on weither it was auto or manual, or which motor it had or if it had Rubicon trim or not. The only difference that I know of between the 4.0 in the Rubicon and in the other Wranglers is the Rubicon is supposed to have about 20% more power than the others. I believe the PCM's will succesfully swap between them - as long as it was auto/auto and manual/manual.

...Anyway, sorry for the tangent

FYI those a calibration ID's NOT different PCM's

Those ID's would indicate a single PCM is shared for all the applications above

[TurboTBSS]

I believe it breaks down like so......

560 - PCM identifier
444 - Vehicle identifier
19 - equipment (engine/trans specific)
AC - revision of the tune

I have never seen that anywhere concrete. Someone correct me if you know for I fact I have it wrong

[hexdummy]

I believe it breaks down like so......

560 - PCM identifier
444 - Vehicle identifier
19 - equipment (engine/trans specific)
AC - revision of the tune

I have never seen that anywhere concrete. Someone correct me if you know for I fact I have it wrong

Sorry, you are wrong, Chrysler does not use an organized or structured part number system like some other manufactures.

[waynehartwig]

You could be right, but those are the part numbers in their catalogs. And if you order those part numbers, you will get a blank PCM.

[hexdummy]

You could be right, but those are the part numbers in their catalogs. And if you order those part numbers, you will get a blank PCM.

Not exactly, the earlier JTEC ecus have, previously and now, come with calibrations installed. At one point they were going to have a "generic" ecu program, but it never happened. Many of the NGC ecus do come un-programmed however, like you said. Those ecu's need to have a calibration installed with the factory scan tool.

- Chris

[Vetteguru]

Is there anyone doing anything with ZJ's? Can anyone point me in a direction? Looking for options on my 98 Grand Cherokee w 5.2