Seadoo GTI 130 (2007) Battery poles mixed up

[seadoo-peter]

Hi all, i installed a fully charged battery and mixed up positive and negative by mistake.
When connecting the lanyard, no beeps but only the fuel pump was running.
I recogniced my mistake and changed the poles back (red cable to positive). Lanyard plugged in and same - only fuel pump, no beeps or functional start/stop button.
I checked all fuses (30, 15, 7.5 & 3A) one by one, all fine.
The display shows at least the correct fuel level.
Moreover, I was told that the fuel pump should stop after 10 seconds and it didn‘t. I‘m afraid there‘s way too much fuel in the injection section now.
Does anyone have an idea? Related threads didn‘t help so far. Maybe I’ve grilled any control unit?

 

[GregRod]

I did the same thing just this weekend on my 2000 GTI. No beeps and no crank after I figured it out and corrected. Turns out I had blown a 5A fuse on mine, but I read that there is a diode in the MPEM that can be blown by the reverse polarity. I replaced the fuse and it beeped with the lanyard and cranked, so I think I'm ok. I believe that you won't get the beeps and it won't crank if your MPEM diode is blown.

I just bought this machine last summer, and I'm a little surprised that your fuse values are completely different than mine. I only have 5A and 15A fuses in mine. Sounds like I need to dig up an owners manual and see what's supposed to be in there.

 

[seadoo-peter]

I did the same thing just this weekend on my 2000 GTI. No beeps and no crank after I figured it out and corrected. Turns out I had blown a 5A fuse on mine, but I read that there is a diode in the MPEM that can be blown by the reverse polarity. I replaced the fuse and it beeped with the lanyard and cranked, so I think I'm ok. I believe that you won't get the beeps and it won't crank if your MPEM diode is blown.

I just bought this machine last summer, and I'm a little surprised that your fuse values are completely different than mine. I only have 5A and 15A fuses in mine. Sounds like I need to dig up an owners manual and see what's supposed to be in there.

Please see my fuse values by zooming in the pic attached. I put every fuse out of both boxes and checked it using a multimeter, no broken circuit obtained for all. Are there maybe some other hidden fuses, I haven‘t found yet?
Anyway, I will figure out what MPEM means and check the diodes. Thanks for the hint

 

[GregRod]

If you checked all your fuses with a multimeter then those are good to go. I wasn't trying to imply you had incorrect fuses on your machine! Rather, I was wondering if I had incorrect values on mine.

Here's a good explanation of an MPEM: What is MPEM and ECU on a Sea-Doo? [Explained] - JetDrift

However, your machine is several years newer than mine. While I'm pretty mechanically inclined, I'm still new to the Sea Doo world and am not dialed in to how the GTI design has evolved over the years. I guess I was just trying to share that I did the same thing, and the result in my case wasn't catastrophic.

 

[seadoo-peter]

Oh, no problem at all.
I just mentioned as much details as possible, to make it easier for possible experts here.
I wished it was as fuse, unfortunately it seems to be the ECU/MPEM unit.

 

[BGS]

I had someone helping me jump an old Mercedes, and despite loud polarity instructions, he swapped pos & neg. Anyway, it blew a secret fuse, that I just got lucky on a blog & found, was no where in the documentation. I would check voltage levels where ever I could, carefully.