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  1. #1

    2002 GTX 4-tec Dying Intermittently. Help!

    Hi, all.

    My 2002 GTX 4-tec dies intermittently sometimes for several minutes before it will restart. When it dies, it's as if you removed the key when you haven't. When I pop the key on and off, I can hear relays clicking down in the engine compartment, but the gauges don't swing. There are no beeps. I have replaced the DESS post, cleaned all of the grounds to the battery, where the electronics ground to the battery cable and where the cable grounds to the block. I have two keys. No joy.

    I'm thinking there's something amiss in the MPEM or in the DESS auxiliary module.

    Have any of you had an experience like this?

    Thanks.

  2. #2
    Just to add: when the electronics are alive and well, the ski starts and runs perfectly. The issue is that it periodically shuts down electronically and will come back to life after a few minutes.

  3. #3

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    I think I would try a known good ecu....

  4. #4
    Speaking of the ECU, I just discovered that some previous owner replaced the ECU with the latest version, 664133. 2002s came with 664130 and it used a DESS emulator between the DESS post and the ECU and MPEM. With the newer ECU, it is supposed to be eliminated. I want to make sure that it is. Does anyone know where it is attached? I assume it's up under the steering assembly somewhere. (My jet ski is in storage. I just stopped by tonight to look at the ECU but didn't know about the DESS emulator thing.)

  5. #5

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    It's up under the steering...you may have to pull out the glove compartment to get to it..it just pops out when you push the two tabs back that hold it in...

  6. #6
    Thanks, Turboted! I'm eager to see if the emulator is still connected. I'll report back what I find.

  7. #7
    Lo and behold, the emulator was still connected even though the ski has the 664133 ECU. I disconnected it and plugged the main harness connectors together. After that, I would get single long beep 90% of the time and a double-beep with a good start 10% of the time. I reconnected the emulator, and the ski would generally start. Hmm. I was expecting the ski to run perfectly without the emulator. I plan to try my other key with the ski tomorrow and see if I get a different result. I'm not sure what to make of this.

    I'm puzzled.

  8. #8

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    You may need to hook it up to the scanner and have them program it without the imulator...

  9. #9
    Today, I tried my second key which is a new OEM key. It double-beeps almost all the time. When I get a chance (maybe tomorrow afternoon), I plan to take the ski for a ride. My hope is that the emulator is flaky and that by removing it, the problem will go away.

    I'll report back when I've had a chance to ride. Thanks, y'all.


  10. #10
    Well, no good. 4-tec still dies for not apparent reason. I now have a 2004 4-tec in addition to my 2002. I plan to swap MPEM and ECU to see if that resolves the issue.

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