under the front of my truck when I came out of work tonight. That can't be from MY truck, I thought, it must be something I picked up off the road and it's been dragging along. Well, I was right that it was dragging along, but it was from my truck! The end still connected goes into the front of the front differential, and the other end has a plastic clip, somewhat battered now, with two little prong connections in it and a plastic guide in the middle. After considerable searching I found what I believe it should be connected to, a similar two prong connector that goes up near the oil filter where it joins another wire coming out of the block right next to the filter, and together they go up into a maze of wires. Does anybody know what this is -- is it some kind of sensor? I haven't had any idiot lights go on or anything, and all my gauges work OK. We're going on a trip tomorrow, but taking my wife's car, so it's no big deal. I'll look at it when we return. Any ideas?

 

Any pictures?

 

No can do, digital cam is being charged for trip.

 

If it's attached to your front diff it the line that checks to see if the ADD has activated.
If you have 4WD it's working.

 

That would be my guess or the vehicle speed sensor (NOT Speed sensor)? I am not sure if Toyota does that, but i know GM does.

 

ADD? Something something differential? (sorry guys, I'm not that knowledgable)

 

ADD=Automatic Differential Disconnect. If you don't have manual hubs, that is what you have. Yes, all that wire is is the sensor for the ADD. Mine has been unhooked for a while now because I swapped in some manual locking hubs. If you plugged her back up and your 4 wheel is working, you gots nothing to worry about.

 

That wire turns on the 4WD light on the dash when you're in 4 wheel drive. Without it you still have 4wd, but you won't have an indicator light.

 

Thanks guys -- I appreciate it!

 

if your looking for the other end to hook into it should run down with the wire for your oil psi sending unit