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Perhaps goofy and definitely out side the realm of Your original question but a lot of these Z13's shares a similar fate with the gauges, rotting gauge needles that liked to either discolor at best or distort and start to disfigure. Here's something if Yours share the same inevitable fate, might consider. 85-160 doesn't matter, needles are the same. 

Hi wookie here is the digrams i have ,

Will try and have a look later, it's very similar to the 1100 stuff I posted. I'm not seeing the diodes you spoke about (I have only had a quick look as I am still working)

OK I have re-done your test plan using your diagrams and the ZN1300 FSM. With these sort of faults you are best to systematically test all connections at the ECU (remember to take voltage readings with everything connected and switched on as normal) The ECU generally needs to see ALL input signals before it will function - have fun and let me know how you get on

 

this is the diode in a gpz1100 harness 
as you can see its just a loop that sits in a tube & then its taped up with the rest of the injector harness (not the main harness) fairly sure it isnt fitted to turbo harness
good luck

rangeroy wrote:

this is the diode in a gpz1100 harness 

as you can see its just a loop that sits in a tube & then its taped up with the rest of the injector harness (not the main harness) fairly sure it isnt fitted to turbo harness
good luck

I could be mistaken but that unit in the grey wire looks like the resistor for the temp sensor ? (it's the only grey wire) the only diode I can see on the diagrams is inside the main control relay

 
 

yep that would be the bad boy, grey wire from a temp sensor (on the air cooled its from head) no idea about the water cooled, I would think radiator like a car?

The gray wire you are suggesting ! Does go to the engine temp sensor, which is located on the right-hand side as you are sitting on the bike , and it screws into the inlet manifold , it's not like a normal temp sender which measures the water temp which is immersed, this one is dry ! I have tried to swap my relays over to my bike and it runs fine ! With it on my bike , then I tried mine on his and nothing,

I don't know how much time you have spent on this so far but you will drive yourself mad if you don't approach it systematically. You need to do the electrical checks I have advised across all 18 pins of the ECU (which will take less than an hour) this will then tell you if you are missing any of the inputs required for the ECU to function. Grab a meter, an LED, a coffee and a chair - this really is the only way to effectively "diagnose" electrical faults of this nature
Might be worth taking a look at the fault finding guide I wrote (link is in my signature)

Temp sensor can be replaced with vw/porsche version if its out of spec, but the wire can harden/corrode at the sensor end so worth a look & as it runs straight to ecu from head easy to check continuity.
good luck