Yamaha 2001, CDI and warning light / sound

[Ole marius Petterson]

No problem. I understood who it was referring to

[zenoahphobic]

I am impressed by the OP not at all worried about what he was referred to as: Marius and Mrs Peterson. Could he really be Ole?

[ChuckB1954]

Yes almost, but we didn't know that. It should have alerted with sound and light also in other situations than just overheating and at low oil pressure.

My Yamaha 50 4 stroke is a 1999 and I don't get any alarms when I try and start it with the safety switch on the controls disengaged.

[Ole marius Petterson]

Wow, read through this whole thread. So it seems everything was as it should be to begin with?

Yes almost, but we didn't know that. It should have alerted with sound and light also in other situations than just overheating and at low oil pressure.

[ChuckB1954]

Wow, read through this whole thread. So it seems everything was as it should be to begin with?

[Ole marius Petterson]

Good to hear,

took some time, but at least you now know what to expect if you have a problem

Yes, it is very reassuring!

Thank you very much everyone, for ideas and input.
I'm very grateful !!! 😊

[99yam40]

Good to hear,

took some time, but at least you now know what to expect if you have a problem

[Ole marius Petterson]

Today I shorted the wires over the temperature sensor, put the motor in neutral, used the gas handle only, and put the rpm to 2500. After about 25 seconds the light and sound were activated, then another 5-10 seconds after, the rpm fell by itself to 2000 rpm and the engine got a different sound. So, fortunately, it is also okay 😊

[Ole marius Petterson]

You said "I got some speed" what does mean exactly?
To set off the rpm reduction function you need to do the test with the engine RPM over 2000.
You could do this with the boat tied to the dock very securely in gear. I don't recommend reving the engine in neutral.

You WILL know when it goes into this mode..the engine will be missfiring and shaking badly.

Glad that you almost got this problem whipped. If it were me I would want to know that it all works as it should.

I tried it out on the sea in gear, and didn't notice exactly what rpm was when light and sound started, but it must have been around 2000 rpm because I hadn't given much gas before it started.

I was perhaps too quick to let go of the gas, ecstatic that I was notified at all, so I didn't notice it. I'll try just that next time I'm going to the harbor. But i am so happy I now have light and sound warning at least 😃

[panasonic]

You said "I got some speed" what does mean exactly?
To set off the rpm reduction function you need to do the test with the engine RPM over 2000.
You could do this with the boat tied to the dock very securely in gear. I don't recommend reving the engine in neutral.

You WILL know when it goes into this mode..the engine will be missfiring and shaking badly.

Glad that you almost got this problem whipped. If it were me I would want to know that it all works as it should.

[rejesterd]

Nice. At least the buzzer works for the important stuff. Something is still faulty if it doesn't buzz with the safety lanyard removed when starting, but that seems to be more of a "hey dummy, you're gonna burn out your starter motor if you keep trying to crank this thing with the lanyard removed" warning, as opposed to a "you better shut down your engine asap before it breaks" warning.

another gold star for rodbolt

[fairdeal]

Anyway, I have the buzzer sound and light that alert me now, so then I'm happy and reassured.

Good to hear.

[Ole marius Petterson]

Okay ... So I did the tests on the sea.

No buzzer when "dead man's strap" was disconnected and I twist the key, and no light in the oil and temperature lights at startup.


Still, when I took a wire from the oil pressure sensor to the metal / minus / earth, oil light and buzzer alerted me when I got some speed.

When I took the wires from the cdi box to the temperature sensor, connected them together, temperatur light and buzzer again alerted me when I got some speed.

I didn't notice, or forgot to hear / look for, if the speed/rpm went down too. Maybe that feature comes a little later / after some more time? .. Anyway, I have the buzzer sound and light that alert me now, so then I'm happy and reassured.


So.... I obviously have a little weird and unusual cdi box .. And it may look like it's the root of everything ...

[Ole marius Petterson]

Hopefully I will be testing all this including rpm over 2000 on Tuesday

[rejesterd]

still need to make sure the ECU get the input it needs to do what it is suppose to do.

and as said before did you ground the points the wires leave the ECU to the lights to make sure that will light up the lights?

What part number is this ECU? The manual says it's CDI, and all the wiring diagrams say the same thing. There's a microcomputer built into the unit, but it's CD ignition as far as I can tell. In all the manuals I've read, ECU/ECM means TC ignition with microcomputer, and CDI means CD ignition with microcomputer.

However, the tests you're suggesting would apply to either so they're worth doing imo.