1998 Seadoo GTI died on water

[whatsajetski]

Memorial day weekend I took this ski out for more or less testing purposes. I have been having problem with the key connecting with the DESS post that I thought I had solved. I had read to wash both with soapy water and it will help restore the contacts, did this and it didn't help, then put a small dab of liquid copper lubricant (kinda like dielectric grease but not as fluid). This fixed my key problem, or at least I thought. We got out on the water and it fired right up and ran pretty good. My wife just hovered around the dock/launch while I parked the truck. I got on started it back up and she was running good. Got out of the no-wake zone and gave it a little throttle slowly, it got up to speed pretty good so I proceeded to acutally ride it going back and forth and giving it throttle and it was running great! Turned around to stay by the dock cause we were still "testing" it. On the way back to the dock the whole ski just shut off. I pull the key and reconnect it, nothing. we stop by the launch where I can stand in the water and work on it. I disconnect the battery and reconnect, nothing. Disconnect and wait 30 seconds reconnect, and I get one beep. Try the key nothing. Disconnect and try and wait longer (about 5 mins) try again nothing. So we loaded up and went home. Once home I voltage test the battery, 12 volts even. I check both the 5amp and 15amp fuse neither are blown. So now I'm stuck. I'm thinking the DESS post might have gone bad? How do i go about testing it to see if that's the issue?

Sorry for the long post just wanting to give as much info as possible.

 

[Coastiejoe]

First, jump the solenoid to see if it cranks well. If it does, then you have a good battery, cables, connections, and starter.

Then do the following tests...

Engine start/stop switch verification;
Disconnect the Yellow/Red wire of the start/stop switch. Using an ohmmeter, connect test probes to the Yellow/Red wire and to ground. Measure resistance, it must be an open circuit (switch is normally open). Depress and hold switch, the ohmmeter should read close to “0” ohm.

Safety Lanyard Switch Verification;
If 2 short beeps are not heard when installing the safety lanyard, disconnect the switch wires.
Safety lanyard removed;
connect the test probes to switch Black and Black/Yellow wires. It’s an open circuit, there should be no continuity.
Connect one test probe to the White/Gray wire and the other test probe to the switch terminal. Measure resistance, it should be “0” ohm. Connect one test probe to the Black wire and the other test probe to the switch ring. Measure resistance, it must be close to “0” ohm.
Safety lanyard on switch; connect the probes to switch Black and Black /Yellow wires. Measure resistance, it must be “0” ohm.
Timer Verification;
The timer is integrated into the MPEM. Always confirm that the fuses are in good condition. To confirm operation of timer, remove the safety lanyard from switch. After 5 seconds delay, depress start/stop button once. The timer should stay on for 33 seconds (for example, the gauge(s) will be activated) and than turn off.
Here is all the info on the DESS codes. It is possiable that you are getting a mixed code.
DESS Codes/ Beeps
2 Short beeps …the engine is ready to start
1 Long beep …no communication to MPEM
4 Short beeps… (on Jet Boats) Shifter is in gear
8 Short beeps…defective MPEM
1 Continual beep…engine over heating


Advanced Self- Diagnostic Mode


By pushing the start/stop button 5 times, you’re putting the DESS in advanced diagnostics. When you have successfully done this, you'll hear 1 short, 1 long beep then, put on the lanyard cap. The engines should start if everything is ok.

2 Short beeps means MPEM can’t read the lanyard cap or it has bad magnet. It could be a bad wire connection at the Lanyard switch.
2 Long beeps means wrong lanyard or bad connection of DESS connection
3 beeps signal the wiring harness of the DESS switch are grounded, or a short circuit somewhere.

You may have a bad connection in your wiring harness, from corrosion. Go through your electrical systems connectors and check for corrosion. Clean them with some contact cleaner, then die-electric grease.

To listen to the codes again start from the beginning.