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Discussion Starter #1 (Edited)
Will not transition between locked and unlocked without disconnecting and then reconnecting the battery. When this problem first showed up, the Waverunner would still start as long as it was unlocked. Now, the start button does not start the Waverunner.

The brown wire to the starter relay gets +12V when you press the start button whether the waverunner is locked or unlocked.

The black wire to the starter relay does not get ground when you press the start button whether the Waverunner is locked or unlocked. This wire comes from the receiver for the security.

Starter and Starter Relay tested and work fine.
Engine cranked and ran fine before start button quit working.

If I manually activate the starter relay, the Waverunner runs fine, but the engine warning and oil lights are displayed.
 

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Discussion Starter #2
Yamaha Dealer Solution:

The dealer replaced 2 major electronic components to fix the problem.

1st the Security Receiver (RECIVER COMP) was replaced. This worked, but periodically the battery had to be disconnected to get the Waverunner to transition between Locked and Unlocked.

2nd the ECU (ENGINE CONTROL UNIT ASSY) was replaced.

I am picking it up this weekend so I’ll post again if I have any further trouble.
 

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Discussion Starter #4
2005 Yamaha WaveRunner FX High Output - FX1100D

I get it back today. They lost one of my receivers and it has been in the shop for 5 and a half months (that's not a typo) , but hopefully it'll be running good...
 

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Discussion Starter #5
RPM limited at times

After replacing the ECU the security works fine, BUT I am now having a new problem.

When running at full throttle, the Waverunner will top out at 9,000 RPM for few minutes and then jumps to 10,000 RPM for a few minutes. ...then it goes back and forth between 9,000 and 10,000 RPM every few minutes. It runs smoothly at either of these RPM.

There is a difference in the sound of the engine when it is limited to 9,000 RPM. It sounds more muffled. Even when riding at much lower RPM you can hear the engine transition between muffled sounding and regular sounding every few minutes.

It also will not idle smoothly. It shuts off at low RPM.

It ran perfectly before the ECU was replaced.
 

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Discussion Starter #6 (Edited)
RPM problem solved

The idle problem and strange RPM issue ended up being resolved with new plugs. FINALLY my waverunner runs like new again! I used NGK CR8EB instead of CR9EB based on some advice about fouling plugs and so far so good. :cheers::
 
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