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I'd 1st check if the ECU opening the fuel injectors,as this will show if the ECU is trying to fire the engine
if the injectors are working you can hear them click - its difficult to hear them with background noise so use a long screwdriver like a stethoscope, placing the handle end in your ear and the metal tip against the body of the injector whilst your assistant turns the engine over.
If you can't hear anything check the ECU power is present by measuring voltage at the fusebox and on its relay socket if OK then check the connections to the crank speed sensor and consider replacing this sensor if the wiring / connections look OK
if the ECU is opening injectors then you can then move onto tracing the coil wiring back to the fusebox and also check that the engine earth connection is on tight and is uncorroded
that simplifies things slightly, is that injector clicking as described?
I'd agree that does sound very high so it might be worth just replacing that wire with a fresh 1 to see if this helps as trying to locate a corroded/ broken wire within the loom is usually very difficult
if the ECU was recieving a crank signal then the injector should click on and off during cranking?
So I'd consider replacing the crank sensor as the next step
Ok I'm going to opt out here and try and get another expert involved who hopefully has direct experience with this issue