[Closed] Motorbike woes - ECU died possibly?

Thanks for the advice given last week. Saga continues.

I've a 2002 F650 Dakar, previously running perfectly. Over the cold spell, the battery started struggling so assumed it had done its time. I got a Mottobatt, fitted it, and it started perfectly. Next morning, went to start it and noticed when I turned the ignition on, I didn't get the coolant light coming on. It cranked over healthily but wouldn't fire.

So I've checked/looked at:
- all electrical plugs/connections to see if clean, attached
- by-passed the side-stand by 'shorting out' the connector plug
- the kill switch does seem to be working i.e. if I switch it off, it doesn't crank
- there's no immobiliser or ABS
- power is getting to the ECU
I've changed the starter relay
all fuses good
- I don't hear the fuel pump come on when I turn the ignition on, but direct power to the pump and it works fine

I borrowed a GS911diagnostic computer checker thingy and it was 'unable to connect to the ecu - please check ignition is on/immobiliser is off/kill switch is off/side stand up'.

Now I'm not a mechanic so struggling as to what to look at now. I've taken the casing off the ecu and the circuit board looks OK i.e. no obvious shorts; little bit of corrosion around pins 28/27/9 but fairly slight.

I'm guessing that the ECU is not activating when ignition turned on ... ? But gather it's very unlikely for them to fail.

Any suggestions - am pulling my hair out!

Thanks