XJ No start. Getting code P1694

[jwc1016]

99 Cherokee, had "no bus" msg, code P1694, checked terminals and replaced CPS, could it be the computer?

 

[Spokes]

Bump lol

But here's the deal. I have the same problems as before as everyone else. Jeep just cranks and won't fire. But I also have the e fan coming on once I turn the key to 'on'? I replaced the cps and still does the same thing but the e fan will surge at time. And the rear o2 sensor relay clicks? Thinking possible bad o2 sensor? Unplugged the wires and all looked good. Really stamped here. Any advice is appreciated!