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I screwed up big time.... - Printable Version

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I screwed up big time.... - PowerDubs_imp - 05-09-2022

...and it was very easy to do.


I was putting my battery back in my bike today- and above the battery is where I have the power commander and autotune as well as a USB from the PCV to the side of the frame and a Battery tender charge cable- so both are accessible from the side of the bike to plug in so I do not need to remove the seat every time I want to read/write autotune files or plug the charger into the bike.

Reason I am telling you that- is I have a lot of cables in the area where the battery goes. The Battery Tender cable is black and the positive end has a red part right at the O-ring connector.


[Image: 06e0f5a790f0d527db7948a8eb56cd51.jpg]





I have the autotune hooked positive into my switched tail light- and used the included O-ring connector that came with the autotune kit to connect the negative to the battery.





Notice the included O-ring has a red end.

Unfortunately today when putting my battery back in the bike- I grabbed the black cable with red end that is the Battery Tender wire- AND the black cable with red end to the auto tune box and put them on my + battery terminal- not realizing my mistake, so I put + to the negative of the autotune box.

As I was tightening the screw- I heard sizzling and then see / smell smoke. Arrgh!

I figured I fried the autotune box- so I uninstalled it- then plugged the PCV into my computer and turned off the autotune option. But the bike won't start, won't even fire a put put- just cranks.

SO- I disconnected the PCV harness and tried again- still won't start.

Could this have fried my ECU? The PCV shows no errors on the software- but the case has a smell. I'm not sure if I should try to pry open the Autotune and PCV to check for burn marks.

RE: I screwed up big time.... - Houtman_imp - 05-09-2022

Sorry to hear about this " frything " experience , hopefully it will not be to costly to "rectify "

RE: I screwed up big time.... - Lord Popgun - 05-09-2022

A quick thought. Did you check the 20a fuse for the fuel pump?

I screwed up big time.... - mvk24_imp - 05-09-2022

The ECU is also easy enough to check visually.

It sits right under the tank on top of everything else.

You could lift the rear of the gas tank up and disconnect the fuel line to raise it high enough to inspect your ECU and see if it is also burned since its just in a plastic housing.

I only remember this because my ECU has the Guhls Sticker on it now and I noticed that when I removed my tank to run some Auxillary wires.

My worry would be the ECU since not only expensive but no option to flash it again like you have now. The PCV is costly also but at least its readily available Sad

2014 CB1100, 1981 KZ440 LTD, 1993 Yamaha XJ600 Seca, 1994 Yamaha XJ600 Seca

I screwed up big time.... - PowerDubs_imp - 05-09-2022

(05-09-2022, 10:01 AM)Lord Popgun_imp Wrote: A quick thought. Did you check the 20a fuse for the fuel pump?


Manual shows one- but the bike doesn’t-

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RE: I screwed up big time.... - mvk24_imp - 05-09-2022

(05-09-2022, 11:17 AM)PowerDubs_imp Wrote:
(05-09-2022, 10:01 AM)Lord Popgun_imp Wrote: A quick thought. Did you check the 20a fuse for the fuel pump?


Manual shows one- but the bike doesn’t-

[Image: a88b740bbe523a640000bc5e5007eeea.jpg]
[Image: 381984e898038f333c3b3218db5a42bd.jpg]
[Image: 179a4e55b680e2ced94fae3daf569d53.jpg]


Sent from my iPhone using Tapatalk


Manual shows one- but the bike doesn’t-

[Image: a74180f994e91d7f9ffdb5643448ca27.jpg]
[Image: fa9988f3f08c1db49b9e13dac71d372a.jpg]
[Image: cd78b709ce23de331d515a62a4bfa226.jpg]


Sent from my iPhone using Tapatalk I might be wrong but I think I remember there being a fuse/relay or 2 elsewhere down by the relays and rectifier under the side covers of the bike.

2014 CB1100, 1981 KZ440 LTD, 1993 Yamaha XJ600 Seca, 1994 Yamaha XJ600 Seca

I screwed up big time.... - PowerDubs_imp - 05-09-2022

(05-09-2022, 10:45 AM)mvk24_imp Wrote: The ECU is also easy enough to check visually.

It sits right under the tank on top of everything else.

You could lift the rear of the gas tank up and disconnect the fuel line to raise it high enough to inspect your ECU and see if it is also burned since its just in a plastic housing.

I only remember this because my ECU has the Guhls Sticker on it now and I noticed that when I removed my tank to run some Auxillary wires.

My worry would be the ECU since not only expensive but no option to flash it again like you have now. The PCV is costly also but at least its readily available Sad

2014 CB1100, 1981 KZ440 LTD, 1993 Yamaha XJ600 Seca, 1994 Yamaha XJ600 Seca


You could easily damage any of these electronic boxes internally and see nothing on the outside.

And that is the case here none of the three electronic units the ECU, the power commander, or the auto tune box externally show any damage.

But I definitely heard sizzling and smoke in the battery area where the power commander and autotune box were.

But they are both now removed and the bike will still not start.


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Found it- under a little black cover. Would be nice if it actually said or show that in the manual.

I swear older manuals did a better job than modern manuals do both on cars and bikes.

Alas the 20 amp fuse is just fine. My guess is the ECU is fried at this point since I’ve already ruled out the auto tune box and the power commander.

Just find it amazing that hooking up the negative to positive on the auto tune box past power back through the power commander and then up into the ECU.


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So- just bit the bullet and bought a new ECU.

The part # in my bike is 38770-MGC-A42

I found a good deal on a NEW one with the same part #.

The parts breakdown for our bike shows the ECU has now changed to part # 38770-MGC-A43

I wonder what changed.

So- I will swap in a new ECU and see if the bike starts. If it does- well, at least the bike will run. If it doesn't- I don't know what to do next.

RE: I screwed up big time.... - Cormanus - 05-09-2022

Bummer, PowerDubs. If it's that easy for someone capable to do, what about us incapable lot? I hope you sort it.

RE: I screwed up big time.... - PowerDubs_imp - 05-09-2022

Yea- I'm bummed. And yea- I said to my wife- all the complicated stuff I do- and something so simple bites me. Dumb mistake.

I'm OK with buying a new Power Commander or Autotune box if need be- but will hate to loose the Guhl ECU.

I wonder if he can 'clone' a new one since I bought it already- technically he isn't tuning or selling me anything new- he would be supporting an existing old customer.

RE: I screwed up big time.... - mvk24_imp - 05-09-2022

(05-09-2022, 12:28 PM)PowerDubs_imp Wrote: Yea- I'm bummed. And yea- I said to my wife- all the complicated stuff I do- and something so simple bites me. Dumb mistake.

I'm OK with buying a new Power Commander or Autotune box if need be- but will hate to loose the Guhl ECU.

I wonder if he can 'clone' a new one since I bought it already- technically he isn't tuning or selling me anything new- he would be supporting an existing old customer.
That would be awesome if he can.

And my apologies dubs, I was assuming whichever box smoked may show melted plastic of the housing since they're so small to begin with.

I hope you sort it out!

2014 CB1100, 1981 KZ440 LTD, 1993 Yamaha XJ600 Seca, 1994 Yamaha XJ600 Seca