if there IS a way, I'd imagine is would require more advanced diagnostic equipment than just a basic multimeter.
do you have a buddy nearby with a similar year 2.5 that you can unplug his ECU and plug your ECU into his/her YJ? see if his YJ runs with YOUR ecu... if it does, and YOUR Yj doesn't start with your ECU then you know the wiring is messed up somewhere.
I'd think to test full function of the ECU, it would require all the usual sensors/inputs normally at the other end of the wiring harness, so would be tough to check (if at all) out of the vehicle.
only possibility I can think of is if you have a Jeep dealer nearby who has been a Jeep dealer for a LONG TIME and may still have some of the older diagnostic equipment available to them.
Sean B. - Schenectady, NY - 95 YJ, 350/700r4/NP241, JB Shorty SYE, 8.8 rear, 2" BDS, 1" homebrew shackles, Daystar 1" BL, TJ flares, 35x12.50 General Grabber AT2 on 15x10 Bart D-Truckers, Polyshield polycarbonate windshield, HD over/under crossover steering
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