WARNING TO ALL SUPERTENERE OWNERS,PLEASE READ CAREFULLY

[HeliMoto]

In a nutshell, DO NOT INSTALL a Dynojet O2 Optimizer module with the PCv system , it will fry your main wire harness and fry your ECU , and possibly burn your bike to the ground if you don't get the ignition shut off quick enough, this is due to insufficient increased ground path necessary for the O2 optimizer, the S10 evidently has a weak and barely sufficient ground path.
This happened to my new 2014 S10 last week , destroyed my main harness and blew my ECU so bad that the housing cracked !! When we reported it to the Yamaha tech rep here in Canada , he knew right away that I had installed the O2 optimizer because he had seen at least 5 other bikes do the same thing and explained that it's because of the weak ground path on the S10, he also said it's possible to use the O2 optimizer if you add a supplemental ground wire to the O2 unit, I'm not going
to chance it because if the extra ground wire ever breaks or fails, the system will fry...again !
So please, be careful ! I learned the hard way , almost $3000 (Canadian )Damage ..so far,not including my near, nervous breakdown when I saw the damage to my new baby :-(
I will be contacting DynoJet soon about this ! I'm sure they will be denying any responsibility !!
I will report any news as I learn more, if anyone has any relevant info , please feel free to add here.

 

[Ramseybella]

Sorry and although I am not planning on one thanks for the heads up for others.
Did these guys not test this system on a Tenere before they unleashed it on the public? :-[

 

[TenereStreets]

Let us know what Dynojet says. I've had one installed since June of last year on my 2014 and put 28k miles on it since and no problems.

 

[HeliMoto]

I live in a border town and am good friends with the Yamaha dealer just across the border in Michigan , I'm hoping to talk to him and see if The USA Yamaha tech rep has any input on this situation.

 

[2daMax]

Thanks for the warning. I would probably not install this device but will remain cautious and hands at the keys if I do install a foreign device. Sorry for the loss but glad you are ok.

I have a different thinking, that such as damage can only be caused by a short circuit, when the current flow exceeded the wire harness capability to handle it. It maybe a faulty controller that shorted internally and threw a high voltage/current to the ECU's feedback channels. The ECU fuse only protects the power circuit and not the signal circuits (guessing)

 

[stutrump]

Blimey...sorry to hear that. Please let us know how it resolves

 

[4jranch]

That really is awful. Very sorry to hear this, thanks for the report. Surely Dynojet new after the first incident and should have pulled the product. Good luck, at least you were not hurt.

 

[Checkswrecks]

Sorry to hear of your problem and clearly I'd be upset too, if I took on that much damage. But we have a 19 page thread of folks discussing these with nobody else having such a huge problem. And while I haven't had one on either of my Teneres, I'm at a loss to understand what about it does to ground such a big amount of current. After all, basically it's a plug-in computer that fools the existing ECU.


Any thoughts to what I'm missing here?

 

[HeliMoto]

I'm guessing only some units are faulty, don't know yet

 

[twinrider]

I've been using one on my 2011 S10 for more than a year with zero issues. While I can understand your frame of mind in issuing this warning, unless it is proven conclusively that that your optimizer was installed correctly and it caused your issue, I would be hesitant to make such a sweeping claim.

 

[Rodge]

Sorry to hear about that.
I have the O2 optimizers installed at the stock 13.6 AFR resistance value for about 4000 kms, did NOT install the Power commander V module, I run my own Flashtune map. No issue.
O2 optimizers are a passive device that changes the resistance value (cheating) O2 feedback voltage values back to the ECU, they are inline resistances, the ECU output a non variable high signal (my guess +5 volts) and looks back at the coming value and deducts the lean or rich condition sensed by the O2 sensors in close loop mode, that's it, that's all... Personally I would focus on the Power commander V.
Cheers

 

[trainman]

just out of interest did it come with an earth wire and if so, where did you run it to? did the instructions advise a location for this wire?

 

[Rodge]

just out of interest did it come with an earth wire and if so, where did you run it to? did the instructions advise a location for this wire?

The O2 optimizer module does not come with a ground or power lead, it is a passive device, 2 male & 2 female pigtails to plug inline in the left & right O2 sensors, if either one of the channel would fail in a short or open circuit the ECU would react the same as if an O2 sensor would fail and post an ECU code in the gauge cluster.

 

[trainman]

ok, all a bit odd then that the dealer says you need an extra ground path on a passive device, I suspect the interaction with the PCV module is whats at the root of this issue but don't know them well enough to know the way its all wired

if any device says its ok on a certain bike and you fitted it as per the spec you have a good right to claim damages on the maker - I guess you may have thought of this! how much success you might get is another matter, you would have to gang up with other affected S10 owners I guess?

 

[Rasher]

I never knew you could fit an optimizer without the Power Commander, I thought it was a module that attached to the PC-V.

If that is the case I could have possibly fixed the Arrow low down fuelling issues far more easily than a full custom remap.

I assume you just plug the optimiser into your computer and set a target range - in which case I would have thought just adding the optimisers would really help the ride as it is the closed loop area where the bike is running at its worst.

 

[Checkswrecks]

Not having been there and for discussion, let's set the O2 Optimizer module aside then, as it is not something which involves much power.
The following image is of a PC-V and shows a ground lug at the top, which implies that there is a source of power being tapped into as well. Loosen either of those and you have an increase in resistance which can be a source of heat.
Installation photos show grounding the lug at the battery terminal, which indeed is how the PC(3?) is connected in my son's old Strom. It will be the terminal which initially gets hot, since you've introduced resistance between the alternator and battery. As the alternator tries to charge the battery through the resistance, the current goes up and at that point, I could see the wide-spread damage which the original poster cited. But it wouldn't be created by the device itself.

While this is speculation and doesn't lessen the misery for folks who've had damage, it is also a lesson for all of us about the importance in preventing electrical connections to not be allowed to loosen.

 

[Wanderer]

Hello,
Been reading the thread for a few days now and though I don't have a Power Commander installed I need to ask after the mention of a poor ground on the Tenere, would it be helpful over all to add an extra nice heavy duty ground from the battery to the frame? I have vague memories of doing this on many a motorcycle in the past for similar reasons, though I am old.
Later,
Norm

 

[Gigitt]

I never knew you could fit an optimizer without the Power Commander, I thought it was a module that attached to the PC-V.

If that is the case I could have possibly fixed the Arrow low down fuelling issues far more easily than a full custom remap.

I assume you just plug the optimiser into your computer and set a target range - in which case I would have thought just adding the optimisers would really help the ride as it is the closed loop area where the bike is running at its worst.

You are thinking of the AutoTune 200/300 which works with the PowerCommander.
The AutoTune is a Wide band O2 tuning system that works with PCV so that you can have dynamic Fuel Maps from A/F ratios map.

The O2 Optimiser is different to the O2 Eliminator.
The O2 Eliminator is just a resister to fool the ECU and not trip a FI light and is used when you disconnect the factory O2 sensor to plug in an Autotune 200/300 O2 sensor(s) when using a PCV.

The O2 Optimiser is a bit of smarts in that it only fools the ECU in the Low RPM range.
It also looks to me a old product as it is not mentioned on Dynojet's web page.

 

[Rodge]

I never knew you could fit an optimizer without the Power Commander, I thought it was a module that attached to the PC-V.

If that is the case I could have possibly fixed the Arrow low down fuelling issues far more easily than a full custom remap.

I assume you just plug the optimiser into your computer and set a target range - in which case I would have thought just adding the optimisers would really help the ride as it is the closed loop area where the bike is running at its worst.

Hello Rasher,
Your assumptions are correct, it is not interacting at all directly with the PC-V.
Would it fix the surging issue with the Arrow header? I'm not sure about that, would it help? yes, cure it? trial & error.
It comes as part of the PC-V package and is already preset at the equivalent 13.6 AFR target value, the resistance (AFR target) is adjustable via the PC-V software.
My Flashtune map with the O2 optimizers feels like I have CV Carbs from idle to WOT...
Cheers

 

[Checkswrecks]

Hello,
Been reading the thread for a few days now and though I don't have a Power Commander installed I need to ask after the mention of a poor ground on the Tenere, would it be helpful over all to add an extra nice heavy duty ground from the battery to the frame? I have vague memories of doing this on many a motorcycle in the past for similar reasons, though I am old.
Later,
Norm

Not really with the current crop of bikes. In the bad old days the frame was frequently used as a ground path. Current systems do connect it to the battery to keep a common ground plane, but the electronics themselves have their own ground paths back to the battery. It usually works great, but every now and then a connection point will be troublesome in a connector or common connection, like the FJR spiders experienced for a while. We haven't had anybody mention this as a recurring problem in the Teneres.