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Autotune O2 sensor plug question

John in PA

John in PA

Cruisin' Guzzisti
GT Contributor
Joined
Jul 31, 2009
Messages
255
Location
Hollidaysburg, PA
The plug for the O2 sensor for the Autotune has a smaller plug piggybacked on the main connector. It appeared to be just an empty plastic cap covering what seemed like an unused portion of the connector. I sealed it with a rubber sealant to prevent corrosion. Can anyone confirm that it is indeed unused by the sensor? I read something about this being a fused connector, but did not see anything that looked like a fuse in there. Just don't want to create a new problem while trying to prevent an imagined one.

Any of the other wire entries that should be sealed on that connector? I'd like to prevent a similar situation to the "speedo sensor" aggravation.
 
Any comments in the little "piggyback" plug? Just a dummy used for other applications, or a functional fuse?

Also, I wasn't going to seal the whole connector, but I was thinking about sealing the area where the 6 wires enter. The connector is right in the line of fire for all the crap that comes off the rear wheel.
 
John, sorry, busy weekend from Friday early a.m. on. So the small additional resistor cap in the bag is for the AutoTune or for any other items you may add (i.e. switch, etc) - it is just a spare. Any time something is "piggy-backed" onto the unit, PC-V or AutoTune, an "end" resistor must be placed.

The 02-sensor is an automotive unit, and is very waterproof. The "fuse" on it is actually part of the circuitry and can be left as-is as well. I shrink wrapped a few on the installs I did just for added protection.
 
My question refers to the small removable cap in the back/side of the O2 sensor connector. I didn't screw anything up by putting sealer inside it? I didn't see anything inside the little cap, just an empty plastic rectangle.
 
John in PA said:
My question refers to the small removable cap in the back/side of the O2 sensor connector. I didn't screw anything up by putting sealer inside it? I didn't see anything inside the little cap, just an empty plastic rectangle.
Click to expand...
Hard to say John, there is a way to test the sensor using the AutoTune unit. Check the instructions on how-to.
 
John in PA said:
My question refers to the small removable cap in the back/side of the O2 sensor connector. I didn't screw anything up by putting sealer inside it? I didn't see anything inside the little cap, just an empty plastic rectangle.
Click to expand...

Answering this question, apparently this part of the connector has no function in our application, as everything is working normally. I'm not good at "if it ain't broke, don't fix it!" :oops: :roll: :D
 
John in PA said:
John in PA said:
My question refers to the small removable cap in the back/side of the O2 sensor connector. I didn't screw anything up by putting sealer inside it? I didn't see anything inside the little cap, just an empty plastic rectangle.
Click to expand...

Answering this question, apparently this part of the connector has no function in our application, as everything is working normally. I'm not good at "if it ain't broke, don't fix it!" :oops: :roll: :D
Click to expand...
Yes, if it ain't broke don't fix it. It is worth pointing out that many modern O2 sensors actually vent to atmosphere thru the wires. So you do not want to seal that first connector or the wires up. I would (and did) leave them just as they are. The connector is built for exposed application to begin with and should be fine as is.
 
GuzziMoto said:
The connector is built for exposed application to begin with and should be fine as is.
Click to expand...
Thanks GM, a point I wanted to reiterate as well. They are for automotive use, so anything short of continual submersion in water should be more then fine.
 
My reason for tinkering initially was twofold:
First , all the aggravation with wheel speed sensors that also should be made for weather exposure but have proved unreliable..

Second, the connector is unavoidably in the place here it will be exposed to the blast of swarf coming off the rear wheel constantly if riding in any kind of weather (instead of under the hood in the relatively protected engine compartment of a car). I guess I'd still like a hugger of some kind for the rear wheel.
 
Where did yours end up? My connector is under the swing arm pivot where it is relatively safe.
And yes, on some cars it is safe and dry under the hood, but on many cars the sensor (or one of the sensors as new cars usually have one after the cat as well as before) it is exposed under the car. The speedo sensor is a whole nother can of worms and from what I have seen and heard its issues are likely something stupid like Guzzi engineers mounting it incorrectly as from what I hear the same sensor works fine on other bikes. But I don't know, I could be wrong. What I do know is that O2 sensors need to vent to the atmosphere to work correctly and modern ones typically vent thru the wires so you do not want to seal them up.
 
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