OK, you have done an error code check by putting the kickstand down, key on, handlebar run switch on and you get a blinking red FI light on the dash or you just finished working on the X and have started for the first time and the red FI light is blinking madly at you. After counting 9 blinks and looking in the service manual to see what they mean...er whats that, you don't have a service manual for your X? Shame on you, but all is not lost, just go to Mikes site http://bareasschoppers.com/ECUcodes/
and look up what all them blinks mean.
you forgot to hook up the IAT sensor (Incoming Air Temp) last time you had the air box off. So you correct that problem and the flashing red light has stopped, but the ECU has stored an error code and you want to get rid of it or as Honda calls it, "Self Diagnosis Reset" of the ECU. What follows is a 'How To Do' if ya don't have the manual.
I have attached pic of the old stile, two wire 'service check' connector pre 04 32-pin ECU all models and the new stile four wire 'service check' connector for 04 up 22-pin ECU, all models. The procedure for checking and resetting the ECU is the same for ALL models and all years VTX1800
First the old:
This black, two wire connector (pre 04 32-pin ECU, all models) is located under the seat with a green and brown wire coming out of it. Seat must be removed to access connector. The 'Service Check Connector' is not connected to anything it just lays there next to the ECU. I moved mine to under the left side cover so seat removal is not necessary to use it.
Now the new:
This red, four wire 'service check' connector (04 and up, 22 pin ECU all models) is located under seat with Green, Brown, Green/orange and Black/white wires coming out of it. Seat must be removed to access connector. This connector has a cover over it and it must be removed to use, a simple snap holds the cover in place, be sure to reinstall the cover after use.The 'Service Check Connector' is not connected to anything, it just lays there next to the ECU.
The procedure to check for stored error codes and reset the ECU is the same for ALL years ALL models. Honda wants you to use their big $ diagnostic checking tool that plugs into this connector or make an appointment with the dealer and pay some pimply faced kid to plug it in and give you the news that you forgot to hook up the IAT sensor.
No need for that here is the trick. You use the connector just like the old stile two wire connector and read the stored errors codes (if any) on the dash and remove the codes the same way as the old stile connector is used. All you need to do is use a jumper between the Green wire and the Brown wire, just the same as the old stile. DO NOT touch or connect anything to the other two wires. I use a paper clip bent into a 'U' shape. This means you can use any year, any model VTX1800 service manual's procedures to check and reset the ECU's error codes.
This pic is 'How To Do' from an 02 "C" service manual and works for all models all years.