Honda Hornet engine stalls

Question

I have a Honda Hornet (CB600F) PC41 from 2007. It's the first model with EFI.

The bike has an error that we can detect by observing the blinking pattern of the FI light: 2 long and 9 short flashes. This gives us:

Diagnostic Trouble Code 29-1.

• Description:
  • IACV circuit malfunction:
    • Loose or poor contact of the IACV connector
    • IACV or its circuit malfunction
• Symptoms:
  • Engine stalls, hard to start, rough idling

The symptoms my bike has are exactly the ones indicated above. We have already checked the IACV circuit and replaced the IACV itself but the problem persists. The next thing we're going to do is replace the ECU with the one from a friend's crashed Hornet and check if it's actually the ECU that is faulty.

Has anyone experienced a similar issue and found out what the actual problem is? Any other suggestions? Thanks!

(I don't understand anything about mechanics but I'll forward this to my mechanic.)

Answer 1

Just to give this question some closure, the problem was in fact a defective ECU. I bought another, used ECU on eBay (with two keys -- so it wasn't from a stolen bike, I hope), and the bike has been working fine ever since.