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  1. #1

    2004 Polaris Genesis i (Speed Restriction Setting) on MFI

    The PWC Service Manual 7.21 states the MFI (Multi-FunctionInstrument) screen acts as a command center for security and speed limit functions and interfaces to an optional depth sensor to provide a built in digital depth gauge.

    My question is; how do you set or reset the speed limit function? I have found no additional information given in the PWC manual on this feature.

    One Jet Ski currently max's out at 40 mph, while the other one of the pair does nearly 60 mph.

    I have no indication that they are in S.L.O.W mode.


    Any input at all would be great appreciated! ---------- Jet Man!


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Welcome

    You have two of the same model Genesis i (fuel injected) - correct?

    The MFI display invokes an RPM limiter for specific fault conditions. It is not user adjustable. RPM will be limited to 3500 RPM by the EMM (engine computer) under the following conditions;
    Reverse engaged (switch in the reverse mechanism)
    Engine HOT
    Low oil (not sure on this, need to check the manual)

    The EMM itself will internally limit engine power when various fault conditions are detected such as EMM overheat, injector over voltage, injector open circuit, ignition coil open primary, and several other 'hard' error conditions.

    There are also a number of component failures that can cause reduced engine power;
    Low cylinder compression
    Low fuel pressure
    Failing TPS (throttle position sensor)
    Incorrect spark plugs, failed ignition coil, broken speak plug wire, poorly grounded ignition coils
    EMM internal failures (may or may not trigger Check Engine codes)
    Damaged flywheel or stator
    Various problems with wiring, connectors, etc

    We can walk you through some diagnostics that should narrow down the list of suspects.

    Since you have two of the same model you have the advantage of being able to swap components between the two for testing.

  3. #3
    Thank You for the clarification. Yes, both fuel injected and identical. Do you recommend me building the LED cables for EMM code reading? -

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Reading the EMM codes might provide some useful information.

    Clearing the codes after recording them, then run the engine again. Re-read the codes and see if any 'fresh' codes appear.

  5. #5
    I just took both 2004 Genesis i (fuel Injected) skii's to Havasu. Lets call the fast one (55 mph) Jet Ski A & the slow one (40 mph) Jet Ski B.

    I unplugged the Temp Sensor on Jet Ski A and it immediately went into SLOW mode.. the Display lit up and flashing messages.
    Once i plugged the temp sensor back in, the jet ski cleared itself and ran just as fast as ever.

    What this showed me, is that the slower Jet Ski B is definitely NOT in SLOW mode. There are no engine lights, error messages on the screen and the engine certainly doesn't run as poor as the other one did while in SLOW mode. There must be another cause for the reduced power. (Just as you suggested).

    What would be the most logical next step?


    Eric
    Last edited by JetMfg1; 07-07-2011 at 11:08 AM. Reason: spelling

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Install the TPS from the good A engine onto the bad B engine.

    Do not over tighten the TPS bolts, and make sure you get the tension spring positioned corrected.

    Correct spark plugs installed? NGK PZFR6H only.

    Are all three cylinders getting equally warm?

    What is the max RPM you are seeing on the 'slow' engine?

    Make sure the jet pump is free of debris and the impeller blades are not bent or damaged. You can look through the jet pump intake grate to see the impeller. A small flashlight makes it easier to see in there.

    Also make sure the reverse bucket is not partially blocking the jet pump water flow. In forward mode the water jet should completely clear the reverse bucket.

  7. #7
    Thank You... Quick Question on the TPS (Throttle Positioning Switch?) This is located at the rear of the motor and has 2 bolts holding it in place.

    When removed, the TPS Switch moved freely - What tension spring are your referring too?

  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
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    There should be a circular spring loosely wrapped around the shaft of the TPS. In my avatar you can just see the end of the spring sticking out the lower right.

    When installed properly the spring hooks into the TPS shaft coupler and the other end presses against one of the mounting bosses.

    TPS = Throttle Position Sensor

  9. #9
    Got it! Will switch the TPS's and install the proper plugs. Stay tuned...

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by JetMfg1 View Post
    ... and install the proper plugs....
    What spark plugs were installed before?

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