Like the title reads.
The car won't start, the fuel pump won't prime, the fuel pump works if I jump the relay. What bothers me is the CEL won't turn off. It stays ON and never goes off and it won't give me a code. I jump the ecu harness to get a code and all I get is steady lit check engine light.

Any idea?

 

try a known good ecu

sounds like a code 0 indicating ecu failure

 

I beleive the answer will be no, but could I use the ECU of my D16Z6?
The DX as a D15B7(or what ever stock motors DX had back in those days)

 

to start it and test yes you can - see if that makes a difference

 

Possibly bad ECU, but more likely blown alternator fuse or bad thermostat ground. Both of these will cause the solid CEL/no start condition you speak of.