Wheelieking 10 Posted January 2, 2020 Hello want are symptoms of a bad ecu Share this post Link to post Share on other sites
Melatv 774 Posted January 2, 2020 Hi: Big welcome -- first thing I would say bike doesn't start. Share this post Link to post Share on other sites
bcsman 1,345 Posted January 2, 2020 Welcome over here, what 's going on with your 450?? Share this post Link to post Share on other sites
Wheelieking 10 Posted January 2, 2020 Well first thing a while back had to replace regulator. Then fan started acting up it would run all the time and with the rpms of motor so it would really move air if I got on it haha. Replaced battery then a few days later it just quit. Everytime I turn key on it pops ignition fuse but if I unplug the smaller connector on ecu it doesn't blow fuse when I plug it back in it pops. Then every now and again electric shift wouldn't work but if I just cycle key on and off a time or two it would work fine. Thanks Share this post Link to post Share on other sites
Wheelieking 10 Posted January 2, 2020 Also reverse light is on neutral light doesn't work but it does turn over fine Share this post Link to post Share on other sites
bcsman 1,345 Posted January 2, 2020 I know the first thing the pros here are gonna ask, are the parts you have replaced so far oem Honda parts or cheap China ones?? 1 Share this post Link to post Share on other sites
Wheelieking 10 Posted January 2, 2020 Only thing I've put on is a regulator and I can't remember if it was oem or not. Share this post Link to post Share on other sites
bcsman 1,345 Posted January 2, 2020 1 minute ago, Wheelieking said: Only thing I've put on is a regulator and I can't remember if it was oem or not. Any idea where you bought it? According to your post you replaced the regulator and then all these other symptoms showed up. Maybe I misread.... Share this post Link to post Share on other sites
Wheelieking 10 Posted January 2, 2020 That's true haha could a faulty regulator ruin a ecu. And since I'm new here I must quote my father from years ago. Hondas will last as the rest go fast. Thanks Share this post Link to post Share on other sites
Wheelieking 10 Posted January 2, 2020 But new regulator was probably on bike for 6-8 months with no issues Share this post Link to post Share on other sites
bcsman 1,345 Posted January 2, 2020 Have to see what some of the pros have to say. Do you have the service manual for your model? If not you can download from the menu, it will have troubleshooting charts and wiring diagrams...that's alot going wrong which may lead to the ecu, it performs quite a few tasks... Share this post Link to post Share on other sites
Wheelieking 10 Posted January 2, 2020 I will download it and take a look thanks for the help. I must add the 450 is 22 years old and haven't had a lick of trouble till now so I can't complain a bit Share this post Link to post Share on other sites
bcsman 1,345 Posted January 2, 2020 I have the same exact model so know it's a good ATV... There are some really smart guys on here that I'm sure will take a look, kinda slow tho over the holidays.... Share this post Link to post Share on other sites
bcsman 1,345 Posted January 2, 2020 Just so ya know an oem stator cost is $172 so if you spent less than that it may not be..... Share this post Link to post Share on other sites
shadetree 5,543 Posted January 2, 2020 10 hours ago, Wheelieking said: Well first thing a while back had to replace regulator. Then fan started acting up it would run all the time and with the rpms of motor so it would really move air if I got on it haha. Replaced battery then a few days later it just quit. Everytime I turn key on it pops ignition fuse but if I unplug the smaller connector on ecu it doesn't blow fuse when I plug it back in it pops. Then every now and again electric shift wouldn't work but if I just cycle key on and off a time or two it would work fine. Thanks was the reg/rec oem from honda ?. if not ?, i'd worry about this first hand !. if you had to replace battery, either from old age ?, or, it was not recharging ?. this leads to bad stator ?, or bad reg/rec ?. soooooooooo..lets start fresh !. first: MAKE SURE YOU ONLY BUY AND INSTALL OEM PARTS FROM HONDA !!, DO NOT CHEAP OUT, AND BUY CHINA JUNK JUST TO SAVE A BUCK !!!!. 2nd: my first thought tells me your stator or reg/rec went out ?, you should have tested the reg/rec BEFORE you purchased another reg/rec ( and I hope it was replaced with oem from honda ? ). if the reg/rec is replaced if it was bad ?, then you should have tested the stator by ohming it out. 3rd: if it cranks, but no neutral light ?, bad bulb ?, and its grounded to frame engine to bypass the electric start while in gear ?. either way..fix it !. Share this post Link to post Share on other sites
Wheelieking 10 Posted January 3, 2020 Update come to find out junk regulator it is charging up in the 17s with a little throttle. Fried ecu, and fan module. Without ecu plugged in bike will start and run good. And I looked back on my records and sure enough I bought a cheap regulator trying to save a few bucks. Lesson learned again and it cost me $400 for new parts. 2 Share this post Link to post Share on other sites
Wheelieking 10 Posted January 3, 2020 Also I never figured bike would run without ecu plugged in but it does. Just won't let u use electric shift Share this post Link to post Share on other sites
bcsman 1,345 Posted January 3, 2020 Well guess we had you headed in the right direction with the China parts, happens so many times, try to save a few $$ and end up costing more in the long run. Let us know when you get things going again.... Share this post Link to post Share on other sites
Wheelieking 10 Posted January 3, 2020 For sure thanks fellas. I ordered parts so I'll let u guys know when she's done 4 Share this post Link to post Share on other sites
shadetree 5,543 Posted January 3, 2020 thank you for the update !!. Share this post Link to post Share on other sites
Wheelieking 10 Posted January 9, 2020 Update on the 450es. New ecu, fan control module and regulator all OEM parts👍. And she is back to running like a dream. Thanks fellas 4 Share this post Link to post Share on other sites
bcsman 1,345 Posted January 9, 2020 Good deal glad she's going, I know I love mine too now she's fixed up. Don't be shy now check in here just to say hi and see what else you can learn. There are quite a few 450 ES around yet and always something to pick up... 1 Share this post Link to post Share on other sites
