So, after reviewing my ECM harness to PCM docs, I realized I'd forgotten a couple things and one thing didn't work the way I wanted it to. I also integrated some suggestions.
Forgot the OBD ECM and INVECS flash connectors and the transmission speed sensors. I had no protection for the PCM from the A/C and Condenser Fan relays. And, as I found out the hard way, it's not possible to normally solder leads to the dash transmission Neutral bulb.
Anyway, so now I'm waiting for some parts. Again. <img src="/forums/images/graemlins/rolleyes.gif" alt="" />
Updated ECM harness to PCM wiring diagrams I think I have the basics of a parallel MegaSquirt III MS3X installation fleshed out, too. So, for those who might care ...
http://www.4x4extremesports.com/Docs/ECM...ess_Pin-out.pdfI guess the good thing is, if it works as I think everything does, a parallel install shouldn't be as bad as I thought. The only thing I ran into was the need for retaining a 'fake' injector in the ECM/PCM harness. The '97-05 ECM/PCM measures voltage surge on the injectors as a way to make sure they're working. If the surge isn't there, the ECM/PCM goes into limp-home mode and triggers CEL. Limited research hints that the OBD-II Montero ECM/PCMs behave the same way.
According to what I've read, the majority of the time an injector can be simulated with a big resistor. In this case, something like a 13-16 ohm, 50W monster like I'm using to simulate the automatic transmission shift solenoids. It doesn't always work. Guess I'll find out if I get that far.
I can't decide if I want to piggy back the ECT and IAT or run separate sensors for the MS so I drew both. I already have all the parts for a GM/Delphi IAT install in the intake pipe, so I'd almost certinly go that direction for the IAT. Unfortunately, I don't know of a practical place for a GM/Delphi ECT. I guess drilling and taping and existing boss in the coolant pipe isn't exactly brain surgery but the less modifications required the better in my opinion.
DIY is now selling the the new knock sensor add-on board for MegaSquirt II/III. Which is very cool, 'cause it should work with the stock Mitsubishi Gallant/Eclipse/etc. knock sensor that goes in the valley on the 3.0L and 3.5L engines.
So, do the Montero and Montero Sport 3.0L and 3.5L engines come with the threaded hole under the intake for the knock sensor from the factory even though the vehicles didn't come with knock sensors originally?
Edward
