Thanks again to all whom have made the effort to be helpful.
Found both atmospheric and air intake pressure senors to read 4.98 v [the spec. range is 3.75 - 4.25 v], so they are equalised but slightly out of spec.
After having lifted the tank and tested the pressure sensor along with...
Thanks for your thorough and inciteful reply. I have done exactly as you have said - sadly, no joy. Engine light still on and error (or fault) code 20 still showing - indeed logging into the corresponding 'Diag' codes does not bring up any error codes [only on my digital display]?
I will...
FZ1-S: [2006] mods; PC3, META alarm, Carbon Can Co. slip-on [mapped PC3]
An appeal to all you good and 'experienced' bikers out there - I'm exasperated!
My Yam engine light comes on without any rhyme or reason [giving error code 20 - 'intake temperature/atmospheric pressure' symptom]...