Author Topic: 2003 Fat Boy Check Engine Light  (Read 314 times)

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Offline scootertrash1

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2003 Fat Boy Check Engine Light
« on: April 16, 2019, 07:01:48 AM »
Some time ago, I used to leave my 2003 Fatty FI in Florida plugged into a Battery Tender. At one point, lightning or a power surge caused the Battery Tender to blow up. Parts all over the garage floor. I hadn't been around for 6 months so not sure exactly when it happened. Battery was completely dead. Wouldn't take a charge at all. Replaced battery. All is well, but I have a the "engine" light that comes on all the time. How to clear?

Offline Scotty

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Re: 2003 Fat Boy Check Engine Light
« Reply #1 on: April 16, 2019, 01:24:56 PM »
Download this and read

https://app.box.com/s/behcx58ok756d4nq2jwi

Someone will chime in and tell you how to do it through the speedo but that did not happen until 2004 so this is how you do a 2003 down.


Offline scootertrash1

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Re: 2003 Fat Boy Check Engine Light
« Reply #2 on: April 17, 2019, 06:25:19 AM »
Thanks. I'll go through the error checking. That 50 start cycles could be tedious!

Offline scootertrash1

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Re: 2003 Fat Boy Check Engine Light
« Reply #3 on: April 17, 2019, 07:48:28 AM »
Thanks for the PDF! Great information that I'll keep! Here was goes so far. I already had a jumper made up, I am a former ET from the electric utility business. Jumped pins 1 & 2 on 91A. Flipped the main switch to "on". Nothing. After several minutes, I flipped the kill to run. Fuel pump did it's thing, hey, following the directions to the letter! I did get one flash. A pretty long one. Then it went out for a several minutes, then came on solid for over 5 minutes when I killed the main switch.
Since this all occurred, it's been several years when the Tender lunched it's self. The drill is: You get on the bike, turn main switch on, flip kill switch to run and wait for the light in the dash to go out. Start the bike, usually in about 1 to 2 minutes, the check engine light comes on. It really appears what I have done here, shorting the pins together, it does the same thing, only I am not starting the engine.

Offline Scotty

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Re: 2003 Fat Boy Check Engine Light
« Reply #4 on: April 17, 2019, 03:36:52 PM »
Sounds like something may be damaged but bike still runs.
Do you know anyone with a Screamin Eagle Race Tuner or a TTS as you can use them to also view and clear codes.

Offline scootertrash1

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Re: 2003 Fat Boy Check Engine Light
« Reply #5 on: April 17, 2019, 05:30:55 PM »
I did in Illinois but moved to Florida several years ago. I don't know of anyone here. Scoot runs great!

Offline scootertrash1

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Re: 2003 Fat Boy Check Engine Light
« Reply #6 on: April 18, 2019, 06:37:59 AM »
Other than popping $3500 for a used Scanalyzer are there any other devices out there that can be had reasonably?

Offline rigidthumper

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Re: 2003 Fat Boy Check Engine Light
« Reply #7 on: April 18, 2019, 07:15:04 AM »
Look at the Twin Scan units from Daytone Twin Tech.  Part number 15202, found here: http://www.daytona-twintec.com/Twin_Scan2.html
Available from most of all our supporting vendors, found 1/2 down the page here: http://harleytechtalk.com/htt/index.php?action=collapse;c=12;sa=expand;db89b92=838545c63becec4d7d6178fae05fb0cb#c12


Offline scootertrash1

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Re: 2003 Fat Boy Check Engine Light
« Reply #9 on: April 18, 2019, 06:01:03 PM »
Done. Thanks! You made that easy.