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DESS, Continuous Beep???

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LouDoo

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This is a strange one at least to me. I've been working on my 96GSX one of the things I did was install a new beeper, also removed and cleaned the carbs.

Now when I connect the lanyard I get a continuous beep, lasts for about 30 seconds. Before I replaced the buzzer I didn't get anything, I know the old buzzer was bad because I tested it by connecting it directly to the battery.

I know that one long beep means that the lanyard is not communicating to the MPEM, but it is or the ski wouldn't start.

I consider this more of an annoyance than a problem, because after 30 seconds the noise stops, but I would like to fix it.

Lou
 
Lou, sounds like one for the Doc. Don't know if providing this additional info will help with the diagnosis or not, but just questions that came to mind.
- will the ski start before the buzzer stops buzzing/beeping?
- if the above answer is yes, does the buzzer stop as soon as the ski is started?

Other than wire cutters or ear plugs I got nuthin. Wait, are ya sure ya ain't got a bee in your garage?

Just had another thought, don't know if this applies to our '96s or not, but on some skis if you don't start the ski within 30 seconds of installing the lanyard, don't you have to remove and reinstall the lanyard (not even sure it that is true), maybe some kind of tie in to the 30 second beep?? The only other rewiring you did on the ski was the new speedo right?
 
Hi Jake,

I just went out and checked a few other things, when I put the lanyard on the post I'm getting a high temp. warning on the info. gauge. I unplugged the lead to the temp. sensor, I'm still getting the same thing, also tried shorting the water temp. wire to ground same thing.

I think this has nothing to do with the DESS communicating to the MPEM, its probably in the temp sensor circuit. I'm going to get the wiring diagram out an start ohm'ing out some circuits. OH, I also tried disconnecting both the info. gauge and the speedo, same thing.

Thanks for the help.

Lou

REVISED: To answer your other question, yes the ski will start if the buzzer is sounding or not, this is another reason I think the problem is in the temp. sensor circuit.
 
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sounds like a plan Lou. Actually, my initial thought was a short in the temp sensor circuit but couldn't connect the dots as to why it would stop after 30 seconds.
 
O.K., I think I'm back to the MPEM, the beeper stays on all the time, especially when the engine is running. I can't find any wiring faults either into the MPEM or out of the MPEM. This probably explains why the old beeper wasn't working. This is probably not worth the expense of a new MPEM and programming a new lanyard. Unless anyone has a better idea I think I'll just unplug the beeper. I've already relocated the pee hole.

I think I'll get an OEM beeper from Nick and try it in case my original theory could be correct and the new one it too sensitive, because as soon as I start the engine the high temp goes off on the info. gauge, but the beeper stays on.

Lou
 
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I thought temp sender for sure.

there has to be something screwed up in the temp circuit...but I guess it could be the MPEM. I highly doubt it has anything to do with the beeper.
 
LOU - I got the same beeper that you did. This is the OEM replacement of the original beeper from FBell. In fact I think I had a couple posts after this beeper being the new replacement one.
I tested my old beeper on a battery and it works just fine but for some reason it won't beep when I connected the lanyard. The new one beeps every single time. The motor cranks but I haven't started it since it has Anti-freeze in it.

I don't think even hooking up backwards would make it beep for 30 seconds.

Maybe you should take some pics and test compression........LOL..... :) Oh and repost your findings..... :)
 
Lou,
If I understand the circuit correctly -

Purple/Tan wire from buzzer ties to Purple wire to the MPEM
Purple/Black wire from buzzer ties to the Tan wire from the temp sensor and Tan wire to the MPEM

-You unplugged the Tan wire from the sensor so that rules out a bad sensor.
-You say there is no short on the wires to the MPEM

When you checked the wires you ohmed them against a ground, not end to end, right?

Any short on the Purple/Tan or Purple/Black wires from the buzzer I would think would show up on the tests you did on the Purple and Tan wires to the MPEM. So, ipso facto (that's Latin for Aw Shucks), I concur, that seems to leave the MPEM. But I'm just a dumb hillbilly so check your compression and post back with the results.
 
I just ohm'ed out the temp. circuit, tan to ground is shorted, should be open. When I disconnect the 4 pin connector at the front elec. box (MPEM) I get an open. I removed the cover from the front electrical box disconnected the tan wire at the MPEM I get an open. This tells me there's a short in the MPEM. I'm just going to leave the tan wire disconnected at the MPEM.

I just happen to have a brand new MPEM but I'm debating because I really don't want to have to get a new lanyard programmed.

Any body else got any ideas?

Lou
 
Lou,
Another thought. Not positive this makes sense or not, but I think it does.

With BOTH the buzzer AND the temp sensor disconnected and the lanyard ON:
- with ski OFF, check for continuity between the Purple wire and the Tan wires from the MPEM
- with the ski running, check for voltage on the Purple wire from the MPEM.
Seems that if either of those tests are POSITIVE, then it would definitely be the MPEM. Does that make sense?

gotta go sand some drywall, God I hate doing that!!!!
 
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Now I feel like I'm chasing gremlins, I disconnected the Tan wire inside the front electrical box at the MPEM, put everything back together and I'm still getting a short from the tan wire to ground. Hell this shouldn't be that hard, I've got a BS in Electrical Engineering. Maybe I should go back for my Masters.

Now I'm thinking I didn't plug the connector to the MPEM, that's and I've got a short in the wiring from the temp. sensor to the MPEM.

I'm going to ponder this for a while, and I'll check out Jake's suggestion when I get back. Thanks for all the help guys.

Lou
 
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do u have it narrowed down to temp circuit, mine will say message wrong sometimes. cousin up north came on for low fuel like that , he started it just to start it, he had winterized it, drained almost all fuel out of it, when u real low on fuel it does that also - low fuel, low oil, high temp, low charge all do that.
 
tater salad said:
do u have it narrowed down to temp circuit, mine will say message wrong sometimes. cousin up north came on for low fuel like that , he started it just to start it, he had winterized it, drained almost all fuel out of it, when u real low on fuel it does that also - low fuel, low oil, high temp, low charge all do that.
Click to expand...

Hey Tater Salad,

Welcome to the SeaDoo forum.

I just checked, low oil and low fuel. They are working properly, both the oil and low gas leds flash when the lanyard is attached. I get a high temp. message on the info. gauge, it just flashes. I'm getting a short to ground on the tan wire which connects to the temp. sending unit, I can't seem to find where the short is.

Just for the hell of it I'm going to try an OEM buzzer.

Thanks for the suggestions.

Lou
 
I tried an OEM buzzer same results. One other thing, the buzzer stays on all the time even after the engine starts, also when I pull the lanyard, I can hear a faint click, like maybe a relay? I think I'm back at looking at the MPEM.

Lou
 
Lou,

Do we know how the circuit works? Is there constant voltage from the MPEM to the buzzer and when the temp sensor closes it goes to ground and completes the circuit, OR does the sensor somehow signal the MPEM to send voltage to the buzzer?

Ya got 4 wires, a sensor, buzzer and the MPEM. Maybe put your meter on the other ski to see which way the circuit works. Then disconnect things and test one at a time to rule things out.

I think ya might be gittin a bit flustered and not thinkin straight. Maybe ya need a break and a beer to clear your head.

If there is constant voltage to the buzzer, maybe it shorted internally?
 
hey just another thought, are you taking the lanyard off when you do your continuity tests. if the MPEM is putting voltage in the circuit it will screw up your ohm testing.
 
THe buzzer is fed power, and all the sensors control the ground to complete the circuit. So... disconnect all the grounds to the things that can be wrong, turn on the power, and then plug them back in one at a time until the buzzer starts to buzz.
 
I've pretty much done all of the above, I've disconnected everything, water temp., gas sending unit, oil level, all the gauges, the only way I can get it to stop buzzing is to disconnect the buzzer.

I believe there is a short in the temp. sending circuit up side of the MPEM, I'm getting resistance when it's plugged into the MPEM. I'm going to borrow a Fluke meter from work tomorrow and see exactly how much, I don't trust the meter I have at the house. I also tried unplugging the tan wire inside the electrical box that went to the MPEM, still a buzzer.

I feel like I'm chasing ghosts, the tan wire from the temp. sensor appears to be O.K., I could try to run a new wire from the temp. sensor to the MPEM, I'm kinda thinking it's something in the MPEM. I happen to have a brand new MPEM, but I'm not sure if that would tell me anything or not because I don't have a lanyard programmed for it.

The other thing I can hear a faint click when I disconnect the lanyard, is there a relay in the front electrical box or in the MPEM, the MPEM is apparently Top Secret.

I'm thinking Jake might have the best idea, go have a beer. I know when I find the problem I'm gonna really feel stupid.

Lou
 
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On your ski... the continuous beep is over temp. (as you figured out)

Now... with the exception of a short to ground somewhere... there are only 2 things than can make the beeper sound.

1) The temp sender can directly control the buzzer. When the sender is hot, it closes the circuit to ground.
2) The MPEM has the ability to sound the buzzer.


OK... starting with #1.

A) Make sure the wire on the negative side of the buzzer isn't grounded. I would disconnect the wire at the buzzer, and took for a ground. Turn the bars back and forth.

B) make sure the sender is OK. It should be "Open" when cold. If you have a closed sender... that's the issue.


Now... if it's #2 (the MPEM) then there isn't much you can do other than live with the problem, or replace it. I would still check the wire going from the beeper back to the MPEM.



With all that said... if your high temp light is on (and you know it's not hot)... then it's probably just a problem in the wires.
 
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