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Injector getting steady 12 instead of a pulse

3K views 14 replies 4 participants last post by  oic0 
#1 ·
Still fighting my fuel injection issue. I tested the plug to the one thats not firing and the plug is good and giving 12V as it should. Problem is its giving steady 12v meaning the ground side is always getting ground (the others all give 12 then from a hot wire but only ground when firing). What could cause that? Do I need a new ECU?
 
#3 ·
Did another round of testing

Ground wire on that one constant ground when bike on or off
Other ones only ground when its priming

Unplugged ECU and the ground went away so it doesn't appear to be to the frame or in the wire harness. I dont understand how these ECUs work or how it could give constant ground when failed.
 
#10 ·
For the purposes of troubleshooting, does the problem follow the wiring harness, or the injector..... if you swapped out 100% on the rail, it would then follow that the issue is in the plug, or the harness, or the ECU.

If there any sort of piggy back fuel management system involved?
 
#11 · (Edited)
Piggyback was removed for testing.
Plug apart. It appears to be fine.
I tested that the harness isn't finding its way to the frame somewhere by unplugging the harness from the ECU and seeing if the ground wire still finds ground, it did not.
I did not test to see if its grounding to another ground wire somewhere inside the harness. Couldn't think of a way to test that without cutting. I also did not test to see if the ECU is pulsing right at the plug, couldn't think of a non risky way to test it.

*This is a plug that the piggyback plug came apart and I put it back together backwards. I figured it out and fixed it. I can't think of a way that could damage anything, but that's the only thing that's happened to it. :O
 
#14 ·
Glad to hear it.... sorry that it took another ECU to get it sorted out.

I suspect that there was a 'pull up' or 'pull down' set up involved in what was damaged.

Whenever there is a need for a very fast change in state, it is common practice in electronics to 'drive' the signal to the state you need it to be in. This almost always means there is a very lightweight semiconductor device that causes the change in state, which doesn't take very much power to make the change start.... the rest of the change occurs because of the 'pull up/down' network.

If you wired up the feed for the bazazz with the leads reversed, that low power handling device probably tried to handle continuous power for how ever long it could. I doubt it survived more than a few seconds before it failed.

I would think the Bazazz may be okay -- have you put that back in play already?
 
#15 ·
Power commander setup. The quickshifter specifically is the part that goes to the top injectors and the one I messed up. Yeah, i hooked it all back up and it works fine. Makes beautiful little burp shifts.
Can also say that the auto tune definitely made the fueling feel better. More responsive all over without making me smell like gas as I got with a static value system when it was tuned to be responsive.
 
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