2002 Seadoo GTX 4TEC N/A .... Where is the electrical Expert?

[Jeff_5_7]

Ok here we go

I have a 2002 Seadoo GTX 4Tec i picked up last weekend that is dead. Dead as in hook up a battery and nothing. No gauges no beeps no fuel pump nothing. Now the research begins. After digging through the shop manual and wiring diagrams i have finally gave in and am seeking expert advice.

When i bought it i was told it was jump started off a truck so i assumed ok MPEM is fried and that's why its completely dead. So i get a new MPEM off Ebay from an 03 GTX (SC but dont think that matters) Hook it all up and plug in the lanyard that came with the new MPEM and the fuel pump comes. So im thinking sweet im getting some where. Still no gauges and i hit the start button and nothing. The fuel pump came on/off in two seconds intervals about four times. Then i unplugged the lanyard. The fuel pump has never come back on again.

Here is where im at now. I have two MPEMs with two different lanyards. What i really need to know is if the code for the key is stored in the MPEM or the ECU. From my research i believe the code is stored in the ECU but the MPEM is what checks it. So i still unsure which key i need to be using and if i will need to be hook ed to BUDS for a reprogram.

On a side note i have already replaced the DESS post with a working on as that when the ski was jump started it fried the old one.

Im still stuck not matter which key i plug in and which MPEM i use the only think i get is the TOPS valve click and this happens when the reed switch is closed on the DESS. Still no gauges no fuel pump no crank. Starter is good i bypassed the relay to check it. I have 12v going into the MPEM and i have 12volts at the Fuel pump and at the Gauges but i believe the ECU has to ground these circuits.

The buzzer does not buzz it very faintly clicks. From listing it seems some times i get two clicks other times sounds like three clicks.

What i would really like to is what exactly is suppose to happen as the lanyard is plugged in . As in

Reed Switch on Dess Closes MPEM or ECU checks for lanyard code.
TOPS Valve Clicks
Fuel Pump come on
Gauges light up
finally start up when stat button is pressed

I believe this is how this is suppose to work and i do understand the MPEM and ECU work together to get all this done.
I have cleaned all grounds and most electrical connectors.

I really think the lanyard is still the issue being it the code in the MPEM or ECU not all matching
Or im thinking maybe my ECU is fried from the jump start but i don't know which wires to check to see if it is getting power and sending out correct ground signals.

So i need the Electrical expert to help me and maybe we can get this solved

Thanks Guys

 

[Jeff_5_7]

Also i have check all the fuses in both MPEMS and they are all good.

 

[BMANN06]

I'll assume you've checked battery voltage and its good?

I'm pretty sure your going to need buds system/candoo system to get the two devices talking to each other. But with that said, I would start with the original parts (mpem) in the ski and make sure you go over every fuse and connection. Make sure youve got a charged battery. Did you ensure you grounded the MPEM to the front of th engine block?

 

[Jeff_5_7]

There are Three ground on the front of the block two go around to the ECU and on straight to the battery correct? At the battery end there are two more little black wires that tie into the big on that ground the MPEM correct?

Battery shows 12.37 volts or so and i belive that is enough. It will start my 98 Kawasaki STX but it also has alot less electronics.

The only fueses in the ski are the 2 on the started relay and then the 2 fuse banks on the MPEM correct?

 

[BMANN06]

Have you got the manual for your ski? If go through the "electrical" section and determine where all your fuses are, check them out. Also, confirm all your grounds. If you don't have a manual lmk, my daughter is going for a nap shortly and I can check it out for yah.

 

[Jeff_5_7]

Update

Plugged the original MPEM back in and now i got the fuel pump to come on as well at the tops valve click but nothing else/ Anybody know why?

 

[BMANN06]

Update

Plugged the original MPEM back in and now i got the fuel pump to come on as well at the tops valve click but nothing else/ Anybody know why?

Where your Positive lead to your battery physically connects to your battery there are some hidden fuses in there. Check these out as well. Are the two MPEMs the same part no.?

 

[Jeff_5_7]

Yes MPEMS are the same part number and are you refering to the two 30amp fuses in the starter
solenoid

 

[BMANN06]

Short the starter solenoid terminals (throw on some safety glasses) they can arc a bit. This is a decent load test on the battery, and let us know if the starter spins the motor. If that test passes get your meter and and determine if you have voltages across the fuses in MPEM, sorry if I've already asked, there is another member who I was helping out with a very similar issue.

 

[Jeff_5_7]

I have already shorted the started it turns over fine. I have 12volts across all fuses on mpem. Buzzer beeps twice fuel pump comes on but no crank and no gauges
.

 

[Jeff_5_7]

Is there anyway to check is my MPEM is bad fromm where the ski was jump started? I think something inside of it is burned up or it is still possible i have a bad Engine ECU im not sure. I know im getting power to the ECU. I know my second MPEM is good but it has a key issue which will have to be fixed with the Can Doo ir BUDS... I am considering but a Can Doo but hate to spend 400 or 500 and not fix the problem.

 

[BMANN06]

Lets get back to solenoid, there is a modular plug that actuates the solenoid. You may have a bent contact thereby not allowing the current to pull the solenoid down. Have you got a spare solenoid? Try that ... thats what it sounds like to me. Or pull the actuator plug off and put your meter across it. Have someone push your start button and you should see 12V when button depressed.

 

[Jeff_5_7]

yea i never thought about check voltage at the solenoid. Can the start relay fail? Where the two 30 amp fuses are and the Positive battery lead? I still think there is something in the circuit somewhere that was "burnt up" when the ski was jump started

 

[BMANN06]

For now lets assume that everything is fine and we are just troubleshooting possible broken cicuits. Can you put you meter across the actuator and get the button pressed to see if 12V appears. Not the solenoid terminals but across the actuator, its a little modular plug you'll need to remove to expose the contacts.

 

[BMANN06]

One other thing, are you sure you have the right lanyard?? The symptoms you are describing are also the same symptoms you would see if wrong lanyard installed. I know dess system is supposed to beep at you when wrong lanyard installed, but doesn't always on some models. It just writes an error to fault log. You may just need your key programmed.

 

[Jeff_5_7]

i have the original key and original mpem. Remember i do have a back mpem but the key to it is not programed to match the engine ecu. Anyway back to the solenoid. From what i can tell the starter relay is what engages the starter. It has a 4 wire electrical plug and a hot wire to the starter and hot wire from the battery. The wiring diagram shows that the brown yellow and thw purple wire control the switch to turn the starter. While pushing the start button i get 12.30volts on both wires is this correct?

 

[BMANN06]

Can you upload a pic of the starting solenoid I just want to see how they have it hooked up. From the pic I'll also be able to clearly tell you where to measure with your meter.

 

[Jeff_5_7]

No i dont have a camera unfortunately. All four wires on the electrical connecter going in to the starter realy had 12 volts going to them at all times.

im still stuck here guys. None of this makes sense. What typically happens when a ski is jump started

 

[BMANN06]

Give me a day .. I will make a thread on testing the starting solenoid. I will post a link to the thread in this thread so you have quick access.

 

[Jeff_5_7]

ok thanks do you know here the Dess Code is Stored? is it in the MPEM ECU or EMS

 

[BMANN06]

Hey Jeff,

Weather has been crap so haven't had a chance to put a testing document together. Dess Code is stored in ECU, which brings me back (just for a second) to a question I asked earlier. Have you ever seen this motor turn over with the key you have? What I'm getting at is, how are you sure you've got a programmed key? Just for shits and giggles, I took the key for my speedster 200 and put it on the lanyard of my GTI, I had the same symptom you have. I don't get any beeps at all, hear fuel pump engage and thats it. I read the codes and just got the "wrong key inserted" code. I'm not saying that this is the same issue you have, but just throwing it out there. Its still very possible that's something funky is going on with your MPEM or starter solenoid. I will get a doucment together soon and post right away.

 

[ski-d00]

You need a new ECU. I have a used 02 GTX ECU part number 290664130 for $350 (this retails new for almost $800) if you are interested. I can program new or used, normal or learner, keys to it if you like. I can test yours first(for free) but sounds fried from your description. PM me if interested or email directly at ohiopowersports@woh.rr.com.

When the 02-06 4tecs are jump started from a running vehicle, it takes out the ECU, not the MPEM. The MPEM is mainly a distribution center for these years for accessories and a fuse panel. The ECU is the real brains that controls engine management, spark, timing advance/retard, cluster reading, even DESS security and programming. If you change your MPEM, you don't need a new key which is completely different from the older 2 strokes, but MPEMs rarely fail and ECUs rarely fail unless you jump start them.

In 2007, things changed. Clusters have their own IC and need to be programmed to the ECU, MPEMs are basically done away with.

 

[Jeff_5_7]

ITS ALIVE ... Just started the ski for the first time about an hour ago. Thanks to Ski Doo for hooking me up with a new ECU. Everything looks and works good except the gauges. They were dead and wouldn't do anything so i pulled then apart and the little green wire was broken like i have read about. Anyway soldered it back on and there was no corrosion or water inside them but now the little red ! light will flash and the display will flash for about a half a second while its running. It flashes real quick about every 5 seconds. Is my cluster just shot and i have to bite the 500 dollar bullet?