Reply To: GT650R Fuel Pump Fault
Based on that picture, i would say if it tried to say E41 , the code doesn’t exist , so C41 would be correct. Why the ECU keeps saying C41 despite a replacement good harness, will now suggest injector woes (you did say it runs rough, it won’t idle for too long).
So the injectors may just be wanning, i’d still keep an eye on the fuel pump though , as the same error applies to it including any wiring to aforementioned parts.
Also check your ISCV unit with the service manual to make sure it’s working properly as it does control idling when throttle is closed (idle speed control valve / ISCV)