Check Engine Light, Help Needed

Hi, i am recommissioning a mint 2002 Speed triple with only 10K genuine miles, unfortunately yesterday while checking out the wiring under the tank I came across a loose injector lead, also like an idiot I had the ignition on at the same time as the alarm kept going of and was driving me mental.. so now i have a dreaded engine light on, any tips on how to remove this without a diagnostic tool??
Shaun

 

Great, thanks!!