Reply To: Hyosung GT650R EFI (Daewoo ECU) – Won’t hold idle / Stalling issue
You have the mega, mega, mega rare Japanese made ECU by Mitsubishi Motors , I hope it is not fault , but because it is rare , If i were you i would check ebay US and eBay EU for this exact ECU as a backup. (I would trust this ECU or Delphi over any Daewoo ECU as Daewoo Era of Hyosungs had a lot of ECU failures)
If you have a Mitsubishi system on the bike, i would look after it.
If every single thing has been checked on the bike, then I will assume it is the ECU as your last thing to check. No proper way to diagnose it unless it gives error codes itself on the dashboard (service manual = mitsubishi era , will let you know how to get error codes) , if no error codes come, hunt a spare ECU.
If the ECU is not found at all, then have a think and see if there is a very cheap 650cc that was in an accident but electrics intact, get DELPHI as they are more present than the Japan ECU models.
Sorry I don’t have a very good answer to your problem as this is making me assume it is the ECU next. It’s weird how it works without ISCV attached but engine runs normally when riding, so strange, i don’t hear too much issues with Mitsubishi ECU models.