2000 Century DT 60 series "Engine controller no response"

hey guys, Long story....

I need some help with this problem... The other day I took the truck for a spin and after 20 miles driving on highway the engine died on me...I pulled over on the brake down lane and tried to restart. It did start but as soon as I started to move it quit again and then would not start so I noticed the check engine light was not coming on or blinking like it usually does so I went to DIAGNOSTICS on the cluster and it said ENGINE CONTROLLER NO RESPOND 128s254 7o

I asked my wife to watch the cluster to let me know if the CK EN light came on while I went to the battery and checked the fuse that feeds the Ecu and it was fine, I played around with the wire harness under the hood still nothing, Went back to the batteries and now the fuse was blown I installed another fuse, the truck started and I went home.

I went to Freightliner bought a new harness from the battery to the ECU, Right after I installed the harness the lights came on I cranked but it did not start, when I stopped cranking that code was back again.
Once again I checked the fuse on the batts and it was fine I unplugged the connector at the ecu and checked with a test light if it had power, ground and it did. plugged it back in the ecu tried again and this time truck started right up so I went to the ecu and shook the ecu harnesses kind of hard to see if the motor would stall and it didn't.

The truck sat for 2 days I went to start it same thing no lights same code was back so i turned the ignition off and back on again and after like 10- 15 seconds i heard a click like from a relay and the lights came on the code went away and the engine started. so YEsterday (FRIDAY) I took the whole dash apart looking for this relay but found none There was another relay clicking behind the driver's seat on that fuse panel so I shook those wires and a relay and the brake valves would all click on and off so I started checking all wiring connectors and found a wire connector loose and thought that was my problem! but it wasn't because I started the engine and unplugged that connector and the engine did not die but anyways I got something fixed I guess that connector has something to do with the ABS system since the abs module is on that fuse panel.

So if anyone has a wiring diagram for the ecu I would really appreciate so I would know how to repair the circuit My best guess is that something is cutting out from the cab to the ecu.
Thanks!

 

update... in case someone is having same issue.
the other day I pulled the connectors out of the ecu and found that the harness coming from the cabin was rubbing against the ecu case and there were about 5 wires exposed probably causing a short and my problem. bought a good elect tape and took care of that.

 

there is an ecm fuse or breaker in the fuse box inside the cab check that one out, also check the ground wires that feeds the ecm I don't know what kind of truck you have but on the Century the ground wires are bolted on the rear frame near the batteries.