question about the cas
 

so ive been reading that when you turn the cas the injectors click that means its a good working cas. i have read that the way it work is that when you turn the cas the plates inside spin and send a message up the wires to the ecu which in turn tells the injectors to fire. if this is true then that should mean that if i spin the cas and i hear injectoors clicking and some type of fan noise? then the signal should be good to the ecu. so what else would cause a code 11? could the ignition coil relay be a cause or the ignition switch relay that is in the drivers side wheel well? can anyone verify if that is how the cas works or not? im lost with my car and i need help. im border line about to just buy a new engine and a whole new harness for the damn thing.

thanks all
1990 300zx 5 speed t bar 2 seater non turbo 174k