FIXED

Right here goes......
Sat both cars side by side, 2 pico scopes into all 3 wires-Acupunture type probes into rear of plug past seal.


IGN on sensor unplugged just supply is 12v.
IGN on sensor plugged in -on the running car signal wire goes to 12v,non runner stays at 0volts

Already check continuity of wire so happy with that, so.....we swopped ecus(knowing they wont start) but hoping to confirm-what we thought- was an Ecu fault
Identical results as above with ECUS swapped.

Then I knocked probes on non running car and noticed voltage jump to 9volts on signal wire,
then slowly creep back down, wobbling pins in plug caused random voltages on signal wire......been to scrappers today and grafted new plug in...10volts signal wire, fires up first flick of key

Stripped plug...nothing to see, maybe lesson learn to double check reading into front of plug.

Thanks for input yet again
All easy when they are fixed!!

MARK(BIG WEIGHT REMOVED)