The correct part number for your 04 ECM is 38770-MCS-L01... the same part number was used in the 03-07 year models. I went through the same FI26 error and my problem was the ECM.
I did take a pic of my ECM last night so I'm on the hunt for one if it's going to be needed. I should know for sure on Sunday.The correct part number for your 04 ECM is 38770-MCS-L01... the same part number was used in the 03-07 year models. I went through the same FI26 error and my problem was the ECM.
Good luck with it... if you are meeting someone with a similar year model with a good ECM, for sure you'll find out if that is the problem. I hated when the error came up as my gas mileage would suffer and later found out that when it occurs the ECM retards the timing. The bike still ran pretty good, but I'm not sure what harm would be done running it for a prolonged time with the timing retarded. I was very lucky to find a used ECM off eBay from a wrecked 06 with 12,000 miles on it for $75. The cheapest new one I could find was from Partzilla for $681.14.I did take a pic of my ECM last night so I'm on the hunt for one if it's going to be needed. I should know for sure on Sunday.
I think you're good. If the ECM's happy, you should be, too. Learning something new is the best part about these outings.As for now, I'm going to say this is solved unless anyone can think of any other tests to perform.
Shrink tubing helps relieve the stress at this point.I recommend against soldering in automotive applications or anything else where there's vibration.
Solder bonds the strands in the wire together, which sounds like a good thing until you notice that the spot where the solder ends and the strands are free again becomes a stress point. It's better to have the strands free to move and be elastic as they need to.
--Mark
Gotcha! Thank you for pointing me in the right direction. I saw what you referred to and confirmed in the service manual.Not sure what you mean by "both connectors" as there's only one diagnostic connector. It's red and located to the right side under the passenger seat.
I have heard that sometimes this knock sensor warning cannot be cleared from the ECM and a new ECM has to be fitted to solve it.Gotcha! Thank you for pointing me in the right direction. I saw what you referred to and confirmed in the service manual.
So I did that now too and took it out for a spin and unfortunately the dang light came back on again.
When I unplugged my knock sensors as a test for my misfiring problem the computer set an error code for both the left and right ones as soon as the engine reached around 4000 RPM. When I plugged the sensors back in the light went out, but the codes were still in the ECM before I cleared it.The ECM does not store a knock sensor error... when the key is turned off, it resets.
We need a Honda engineer to answer this... the ECM on the 03-07 bikes obviously have some defect with the reported number of failures and Mother Honda seems unconcerned about it...When I unplugged my knock sensors as a test for my misfiring problem the computer set an error code for both the left and right ones as soon as the engine reached around 4000 RPM. When I plugged the sensors back in the light went out, but the codes were still in the ECM before I cleared it.
Those bikes are long out of warranty (as is every one put into service before 2014), there's a known way to repair it, the failure isn't a safety hazard or even what I'd call widespread and the part was superseded on later bikes. What should they be concerned about?We need a Honda engineer to answer this... the ECM on the 03-07 bikes obviously have some defect with the reported number of failures and Mother Honda seems unconcerned about it...