Re: How to check if ecu is working
Here's what I've learned messing with computer bikes. Every wire is in some loop with other jobbers completing a circuit. So you might cut a wire that was in line with the spark, fuel pump, injector, or the ignition group and I'd don't really care about those squid accessory parts you need, you just had to cut a computer bike's wire up and now it's a boat anchor just like that.
Undo any wiring done to the bike, always run a remote wire system off the battery, not a wire touched on a computer bike or here we are.
Computers might have their own fault code for being bad. Bike runs, starts, has no codes, it's not the ECU per say but to look for loose battery cable terminals or a chemical corrosion at the battery posts or connector contacts turning green at the pins. So even if the grounds look good and tight, sometimes the chemical under the ground strap could show an ECU acting up, but more the contacts turning green/white powder like and cause a resistance to occur.