FI light up. Pls Help.

[nitezpeed]

Hi there. My FI has light up and the code appear is -C40. Wondering has anyone appear this problem before and is there any advise in solving it by DIY? Thanks alot.

 

[chunk1340]

That could be the o2 sensor. I read about it on another forum. If I remember it may be due to aftermarket pipe or pc. Someone who knows will be along soon to help more I am sure! What mods have you got and are there any other symptoms other than the FI light and code?

 

[NickSully]

Well according to the service manual C40 is "Idle speed control valve (ISC valve)". I unfortunately don't know what that means but hopefully somebody else does.

Edit:

Okay, found some more info in the service manual:

 

[NickSully]

Also, you can download the service manual here:

https://www.hayabusa.org/forum/gen-ii-busa-information/79087-gen-ii-manual-download-updated-1-2010-a.html

Starting on page 1A-92 has a bunch of trouble shooting info for C40. Good luck.

 

[Harry7]

I installed a power commander, got the C40 code, was told by Dynojet that a wire may have moved but I'm not sure about that. It occasionally stalls which leads me to believe the map is tripping the code. Any ideas?

 

[nitezpeed]

I got my Dynojet remove. Its the same, FI still light up and code is C40. I check the ISC hoses and connection. And everything seem fine. THe last thing to worry is maybe the ISC valve need to replace. I order from my locate agent and till now NO STOCK! Damn.. Guess NExt working day i will drop by and ask about the status of my ISC valve.

Let me know your Out come and lets solve this problem together.

Good luck Harry7