ZD30 2004 Any ideas where the crank sensor sends its signal to,

[Dagwill]

Short story, Stupidly sent 12v back along crank sensor signal line, qhich I now have learned runs on a 5v system. Heard louder than normal click of a realay or solenoid, sounded as though it came from center driving compartment behind firewall, [not sure ]
now wont start, cracked injector line, no fuel being pumped on cranking
Not sure if ive damaged on board computer or cooked the box on top of IP [hope not ]
checked all fuses under dash, all ok.
From diagrams i have found it looked like all wires going to IP came via ECM so hopefully IP is ok
Not showing any fault codes. ?
Yhanks David