The 2.7 is in and mechanically everything is 100% done.
Hirez VersionNotice that the engine harness is laying on the windshield.  Eletrically, a lot of work has been completed, but there is still plenty left to do.  The 2002 harness was for a 2x4, so a couple of 4x4 related connectors were missing.  The 4WD switch (C18 ) was added and wired to ECM connector C-51-3-7 and 4WD low switch (C19) wired to ECM connector C51-1-26.  Both connectors share a common ground with several other connectors, so I was able to splice those into the noise supressor in the harness prior to leaving the engine bay onto a wire that eventually makes it way to chassis connector C52-10. ÂÂ
Additionally, the vehicle speed sensor (C20) had to be extended due to the lenght added by the transfer case.  Also, the post cat O2 sensors were different, so all those connectors were moved over from my 2000 harness.
The 2000 chassis has a 6 pin connector (C59) behind the glovebox that is not present on the 2002.  So I had to cut this connector from the 2000 harness and splice it into the 2002 one.
The biggest challenge will be moving all the pins around on E61 to match the new ECM.  A total of 22 pins will need to be moved.
Here is a shot of the wiring diagrams that I was using to note all the changes between the 2000 and 2002 wiring:
Hirez VersionAnd here are spreadsheets noting the changes on connectors C52, C59 and E61:



The 2000 uses an A/C amplifier, where the 2002 apparently have those functions built into the PCM.  So I still need to figure out what to do with those wires.  And the 4WD light, although that is minor.
I also need to get the MAF for the 2.7 as it is apparently located in the tube immediately following the air filter housing unlike my 2.5 which had it on the engine just ahead of the throttle body.
Other changes include the tank pressure control valve being moved from the inside fender to within the intake manifold from what I can tell, so I need to bypass the one on the fender and run the vacumm line directly to the manifold.  I'll need to reduce the fitting on the manifold since it is much larger than the one on my 2.5.
The evap canister air valve wires were moved to the 2.7 harness compared to my 2.5 and must be located next to the transmission since the 2002 harness had a plug for it.  So this will need to be rewired as well.
Mechanically this was an easy swap since the engines are physically the same, but getting the 2002 PCM to properly operate all the other stuff on a 2000 is proving to be quite challenging to say the least!
I'm off chasing down to the guy that sold me the 2.7 to see if he has the MAF, its connector and the air-tube...