Sammy, check grounds again. Look at page 6 and 7. Test each resistor with an Ohm meter. I'm thinking you should check ground from the negative side of the injectors to the chassis, as well as to the ECU, If I'm reading this correctly?
If you plug everything back in and look at page 20, there is a schematic. You should be able to test the entire system from the plug going into the ECU. It gives you the pin #'s and everything on Page 20.
Also scope out page 33. Do the check on the power relay.
Actually print the whole darn book out and do all the checks in the book from top to bottom!