DESS Post, Key, MPEM? Intermittent start, will sometimes restart after pulling fuses

[KiloRomeo]

I plan on putting together a more comprehensive post later today once I figure out a few things but I was hoping to get a head start with this problem now.

I have a 2002 Sea Doo GTX 4Tec that I'm trying to get running for my FIL so he can sell it. A while back a local shop replaced the DESS Post, MPEM and a bunch of other things to get it running. The replaced it with used parts off another ski they were parting out. We took it out twice and it ran fine until the wear ring disintegrated. I wasn't able to get to it for a few months due to personal reasons. Flash forward to now where I replaced the wear ring and a reverse cable. When I first put it together it started up first try with no problems whatsoever. I put my tools away and hooked it up to the hose to run it for a while and nothing would happen.

No double beep, nothing from the gauges, nada. So I unhooked the battery and started checking fuses. After pulling and reinserting all the fuses on 1 bank, I tried to start it again. It started right back up but my gauge cluster wasn't operable (not sure if it was like this on the initial startup or not). I let it run for 5 minutes. Then I shut it off, and then tried starting it again. Seem fine. Later yesterday I tried again and nothing. No beep/no start. Same with this morning.

Could it be the key? I would hate to spend all this money on a MPEM and DESS post again if that's not the issue. Any other suggestions? Where should I buy a key?

 

[Coastiejoe]

5 minutes running out of the water, on the hose or not, is to long. The Carbon Seal will get no coolant from the water your ski would normally be sitting on. It will destroy itself.

I'll go find and come back and cut and paste some test info in a moment.


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[Coastiejoe]

DESS Post, Key, MPEM? Intermittent start, will sometimes restart after pullin...

DESS TESTING

The Mpem, (Multi Purpose Electronic Module) needs to beep 2 times to let you know it is ready to start. Clean the post and cap with soapy water. Don't use any grease of lubricant on it as it needs a clean connection to make contact. Connect the lanyard to see if it is making a connection. 2 beeps and it's ready to fire up.

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.

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.


Sent from my iPhone using Tapatalk

 

[KiloRomeo]

DESS TESTING

The Mpem, (Multi Purpose Electronic Module) needs to beep 2 times to let you know it is ready to start. Clean the post and cap with soapy water. Don't use any grease of lubricant on it as it needs a clean connection to make contact. Connect the lanyard to see if it is making a connection. 2 beeps and it's ready to fire up.

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.

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.


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Well I cleaned a bunch of connections and I seem to be good to go now. Gauges are working again and the ski seems to have good connections to start everytime.

The cluster does signal that maintenance is required....how do I reset this? I just changed the plugs/oil.

 

[mkov608]

I have the same ski and had the same problem. I replaced the starter solenoid, and that wasn't the problem. One of the locking tabs on one of the MPEM connectors wasn't locked. Once I fully seated the connector, and ensured the locking tab was locked, my intermittent starting problem was history.

You will need a Can Doo (or similar device) to resent your maintenance time.

I plan on putting together a more comprehensive post later today once I figure out a few things but I was hoping to get a head start with this problem now.

I have a 2002 Sea Doo GTX 4Tec that I'm trying to get running for my FIL so he can sell it. A while back a local shop replaced the DESS Post, MPEM and a bunch of other things to get it running. The replaced it with used parts off another ski they were parting out. We took it out twice and it ran fine until the wear ring disintegrated. I wasn't able to get to it for a few months due to personal reasons. Flash forward to now where I replaced the wear ring and a reverse cable. When I first put it together it started up first try with no problems whatsoever. I put my tools away and hooked it up to the hose to run it for a while and nothing would happen.

No double beep, nothing from the gauges, nada. So I unhooked the battery and started checking fuses. After pulling and reinserting all the fuses on 1 bank, I tried to start it again. It started right back up but my gauge cluster wasn't operable (not sure if it was like this on the initial startup or not). I let it run for 5 minutes. Then I shut it off, and then tried starting it again. Seem fine. Later yesterday I tried again and nothing. No beep/no start. Same with this morning.

Could it be the key? I would hate to spend all this money on a MPEM and DESS post again if that's not the issue. Any other suggestions? Where should I buy a key?