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Joe
Joe, Marine Mechanic
Category: Boat
Satisfied Customers: 7136
Experience:  ASE, electronics, Marine mechanical and electronics, pwc, wiring, all around repair tech,
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There I have a 1997 Seadoo GTX and I have starting issues

Customer Question

Hi there I have a 1997 Seadoo GTX and I have starting issues I got a new key from a seadoo dealership because the seadoo didn't come with one and when I put the lanyard on the post I get no beeps but my gauges work. When I push the start button I get nothing and when I do a self diagnostic I get a hi temp warning but I haven't even started it yet.
Submitted: 1 year ago.
Category: Boat
Expert:  Joe replied 1 year ago.
Hello,
Thank you for allowing me to assist you, my name is ***** ***** I will be happy to assist you with your concern today.
For dess systems the key must be programmed to the mpem, if not the pwc mpem will not allow the engine to start. You can get a high temp warning due to a bad temp sensor.
Here is the test for the dess and start/stop:
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.
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.
Thank you!
- Joe
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Customer: replied 1 year ago.
Ok that all sounds good I will try that when I put the lanyard on I get no beeps at all and when I do the diagnostic I don't get any beeps at all either. Does that mean my buzzer might be bad?
Expert:  Joe replied 1 year ago.
It can yes, however it can also mean other things such as a bad mpem, wiring, connections, dess post, etc. Make sure the dess post rings are clean, if dirty use an eraser to clean. Buzzer is easy to test via a voltmeter to see if getting power and ground when you should get beeps.
Thanks,
Joe

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