I am intermittently not getting power to the fuel pump relay, have battery voltage when it starts at the grn/why wire. But only getting around 5v when it doesn't start. Also not getting any spark or injector pulse. Already replaced crank sensor. What's my next step ?

No codes and no security light

 

everything else working ok?...try checking the voltage to the ignition fuses when its not working if its not close to battery voltage your switch may be bad