I ohmmed the main injector and the assist injector...they are both where they should be, 1 ohm for main injector and 27 ohm for assist injector.
Yes, truck was pressure washed............but we have been to the rodeo many times before. We use due caution and shield the actual ECU connectors by covering them with a hood from an old rain suit, and we make sure not to direct the blast toward the ECU.
Only one of these ECUs has ever been wet at all (that being the original one) but the DTCs are present with both ECUs.
Insofar as any residual moisture in the ECU connectors.... I have seen none at all. The truck was washed on 1/16/13 AFTER the initial ECU was ordered (to correct for DTC 0031).
In trying to establish a "time line" I think it is safe to say that the DTC issue I am having now (along with the spontaneous shut down) surfaced AFTER the washing. But when I washed the truck I did not DRIVE it to the wash bay, I towed it with counterweight removed as we were also replacing the muffler. So I now have no way of telling whether or not these 124X codes might have surfaced as soon as the wetting was done. Forensics after the crime are never as good as having an eye witness.
Having said that, I am also beginning to wonder if the very first DTC (1245) I saw after installing the incorrect, initial ECU may not have been due to a compatibility issue at all, but may very well could have been an erroneous code being generated out of "circuit cross feed noise" in the "now wet" engine harness.
The DTCs I am seeing seem to be stating that there is no fuel pressure and that no injection is taking place. Kinda hard to accept when I'm standing next to a running engine (until it shuts down). The codes appear as soon as the engine starts up, not as a result of the engine shutting down, but vice versa.
I think it is now the time for me to have dialogue with Komatsu USA.
I don't want to cut open a $1,500 harness unless I have no other recourse.
Stay tuned.