Honda ATV Forum banner

1 - 10 of 10 Posts

·
Registered
Joined
·
5 Posts
Discussion Starter #1
Hello I'm new to forum I need some help on my 02 trx500fa Honda I bought it this way it was stuck in a high gear. I have read forums and purchased a service manual. ran down the codes it popped up code 11. I removed shift motor the gear was stuck but now free I turned the gear now in low range ive replaced the angle sensor I ran wiring down per service manual it says after all testing to replace ecm I purchased a used one on ebay same thing code 11 I returned it and bought a genuine one from Honda and installed it did the initial procedure and still code 11 wont shift I bought a new shift motor but haven't installed yet this thing only has 261 miles on it and 710 hours very clean atv took all plastic off to work on it and no mud anywhere so its been taking care of please help
 

·
Premium Member
Joined
·
5,956 Posts
Hello,

What did you find that was causing the shift gears to be stuck? What did you do to free them?

Welcome to the forums!
 

·
Registered
Joined
·
1,419 Posts
Make sure the battery is fully charged and putting out the correct voltage. Check all fuses, they are listed in the manual with location
 

·
Registered
Joined
·
5 Posts
Discussion Starter #5
I used a flat head screw driver I checked all fuses several times not sure why the gears were stuck. i got it in low now but its still comes up code 11. even when I clear the code as soon as i turn the key back to the on position the screen starts flashing immediately its like it burnt the ecm out again. when i first installed the new ecm the atv still stated in high gear but the dash said it was in first and i could shift indicator to second just the display the trans was still in high then started blinking again this was with old shift motor after installing new shift motor it came up code 5 i replaced angle sensor then flashed code 11 just as it did before not sure what to do ive ran down all points in the service manual. even the shift motor operates even when i hook it up manually i can get it to turn over hope the trans aint out but i can manually shift the bike from low to high with motor by hooking wires to it
 

·
Premium Member
Joined
·
5,956 Posts
When installing a new ECM it has to be initialized. The ECM initialization procedure must complete without errors at any stage... if your shift motor doesn't shift... then initialization was never completed successfully. The ECM is now going offline as soon as you turn the key on... nothing will ever work until you are able to complete initialization. Follow me?

You'll need to find out why the shift motor doesn't work and fix that before you'll ever be able to get the ECM working again. Start by pulling apart every plug on the bike for inspection. Make sure the frame ground for the harness is clean and tight. If your bike has a bank-angle sensor on it, check and/or reset that. Follow the troubleshooting steps in the manual to get the shift motor working... there can be any number of things wrong with it. All sensors must be plugged in and functional, including the (two?) vehicle speed sensors. It could be as simple as a stuck/bad relay...

Warning: Don't ever turn the key switch on while a device/sensor is unplugged unless the battery is disconnected. The ECM might let its smoke out if you do.... :-(
 

·
Super Moderator
Joined
·
38,518 Posts
where did you buy the angle sensor ?, ebay ?, or Honda ?, brand new angle sensors have been known to be bad right out of the package from Honda ?, sooo..my money says your angle sensor is messed up ?, or, you did not install it right ?. my .02's worth.
 
1 - 10 of 10 Posts
Top