Good Morning, I recently went through the exact same thing. I have a 95 se that i thought was immobilized or the ecu was not communicating with the becm. After continuous research and 10 days of trying things...
I finnally got her started (thanks to datatek & mozz who posted on a past thread)
So, to give a lil back story......
I did everything you did..... with no luck at all
I changed my fob battery.. no luck or light on the fob
I changed the truck battery.. no luck
I entered the generic eka (1515).. no luck
I tried the positionII and battery disconect.. no luck
I have a 99 4.6 as well that has had the the alarm and central locking removed (how i dont know, purchased it that way); i took the key pad and battery back off of the 99 and put them on the 95 key. Now my my (the 95) remote lights up with no problem & key batt low message is gone. (the keypad was worn and the batt connector was a little loose; now firm and perfect)
I go to the truck resync the key and try to start.... NO LUCK!!
I removed my battery and put it in the 99.. the 99 started right up; so i knew the battery was fine...
Replaced the battery, set the windows & LOCKED THE DOORS tried to start.
I got the 'engine disabled press remote mess'.. pressed remote tried to start. no luck. Took key out of ignition and tried again.. This time i recieved the alarm triggered, ignition tampered message. That message was new, and remember reading something about the ignition
I pulled out my laptop and remembered reading a comment by datatek and mozz.
I go to a past thread and read to go under hood and check the 30 amp fuse in slot 2.. and to switch the relay from number 16
YUP YOU KNOW IT.. Fuse was good. Relay was brown at 2 points. I switched it with the air susupension relay since i converted her to coil, turned the key and VRRRRRM..
switched it back to make sure.. nothing just a click in the door and under passanger seat.
Switched them back... PERFECT..
I got in the truck.. LOCKED THE DOORS WITH KEY FOB, attempted to start. got message, hit button, turned key, VRRRRRM. She started right up.
Ive read that the relays can immulate becm conditions. Ive oredered a new relay kit from AB..
LONG STORY SHORT... HAVE YOU CHECKED YOUR RELAYS?
Thanks to datatek and Mozz; my rangie is rovering...