Temp sensor?
If the mechanics run the VCK and the log says that it was overheating, but the temps in the log are all good, then my first impression would be the temperature sensor is bad. Below is a copy and paste from another thread I responded to with someone having code problems with their 4-TEC. While reading this post, pay special attention on how to access your "P" codes, scroll through them, write any and all codes down, then answer the post with the codes and I'll do my best to get any and all inforation on them for you. There are two test, you should only need to do the EMS test. I don't think the DESS test is necessary in your case, but by all means, do it if you like to get familar with your diagnostic's on your Doo! Enjoy the read!
The basic codes are, when you connect your lanyard to the post, you'll hear 2 short beeps, this signals that all is o.k. and the engine is ready to start. 1 long beep means you have a bad connection. 4 short beeps mean the ski/boat isn't in neutral. 1 short beep means the ski is now in neutral. A continuous set of beeps means the engine is overheating.
To add to the basic codes for the 4-TEC series engines, if you get 1 short and 1 long, then the ECM, ECU has been set to the onboard diagnostic mode. If you get a 2 second beep in one minute intervals, then you may have high pressure in the oil seperator tank or low fuel. If you get a 2 second beep every 15 minutes, the the water craft is upside down.
There is also a way to diagnose a suspected engine managment or fuel injection related problem in the 4-TEC's. To check and see if there is a message displayed by the "vehicle information center", you can check for fault codes, which will be the letter "P" followed by 4 digits like P1234, by doing the following.
Directions: With the safety lanyard on the post, press the "SET" button 5 times to start the display of P-codes. Press the "MODE" button to scroll codes if there are more than one present till you get to the word "END". When you see the "end" word on the display, press "MODE" to exit this function. You can write down any "P" codes that you get and if your nice, ask the mechanic at your local Seadoo dealer as to the meaning of the code, their not described in the shop manual. Or you can try and find/buy a "Vehicle Communication Kit" that is used by mechanics to check the recorded faults by the ECU, ECM and the MPEM.
In the advanced diagnostic mode for the DESS, do not connect your lanyard. Press the start stop button 5 times. You'll hear 2 audible beeps, one short, one a bit longer. This means your in advanced diagnostic mode. Put your lanyard cap back on. If you hear no further beeps, then your ski/boat is ready to run. Test complete. But if you hear 2 short beeps after putting on the cap, that means your MPEM cannot read the electronic circuit in the safety lanyard.
2 long beeps after connecting the cap means that you are using the wrong safety lanyard. 3 short beep means the harness of the DESS post is grounded or shorted out.
As you can see, the 5 button advanced test is basically there to trouble shoot the DESS in the event you have trouble starting your ski/boat.
I have gone over some of the issues at hand if a PWC (4-TEC) has been turned upside down. This 4-cycle engine with it's closed loop cooling system and the flow of liquids to the internals of this engine can have a definite impact on the ECU and ECM sensors if it is rolled over with the engine running (for either seconds or minutes...I don't know). Is something wrong with the engine? Probably not. There is probably a sensor that is normally hot and dry when the engine is running and when it went upside down, it may have gone from hot and dry to cooler and wet. The thermal shock to the sensor could have knocked it out of serivce, or it's sending out a bad signal.
In your last post, you said you get three beeps before the ski goes into limp mode. Are you sure there are three beeps? Going into limp mode is one of the best designs anyone every invented for an engine. This lets you know there is a major problem and can lead to major mechanical engine failure if it's not taken care of. If you do have a problem and you re-set the code and continue to run until you get the "limp" mode again. Sooner or later, what ever it is will become known to you by an obvious sign (blown super charger for instance), by then, it'll be too late to find the least expensive fix for your Doo.
Sorry for such a long post, but the information on the 4-TEC is extensive. You really need a manual for this engine if your looking to solve a problem or just wanting to learn about the functions, features and safeguards to this engine. We offer these services as a "Premium Member" where you can have complete access to our library of manuals and the one on one service offered. Thanks again for you question and I hope this is of some help!
