Crawl control deactivating and rear diff lock

Good day. The other day I was out ice fishing and happened to get stuck. Basically stopped and sunk down to axles. so I put rear lockers on and still stuck, activated crawl control and it would start working but the truck would start shaking a lot. and the crawl would deactivate on its own.

I checked everything once I got out and everything was still working as should be.
What would cause the crawl control to deactivate on its own?

thanks.

 

It has to unlock the rear axle. The only way to send power to a non slipping rear wheel is to have the locker deactivated.

 

Crawl uses the brakes to control wheel spin and locker defeats that purpose.
Also, never use 4lo unless you need extra torque because that's all 4lo gives. Keep it in 4hi and use crawl to get unstuck.

 

I think crawl control only works in 4 lo .

 

Uhh...not to be a jerk, but that’s the whole reason for the lockers existence. It physically locks the two wheels together. Brake based traction control can attempt to emulate this, but it isn’t nearly as effective.

 

I believe this article says both MTS, CC and Lockers are all possible at once

https://www.tacomaworld.com/threads/3rd-gen-traction-control-modes-explained.530695/

 

In the tiny bit of reading I did on the 2020+ crawl control deactivation thread, engaging the locker seemed to help things. Was your locker engaged, or still blinking?

 

Crawl control works fine with the locker on on my truck. It still manipulates the front wheels and throttle with the rear locker on.

 

So it treats both tears as one?

 

Then I misspoke. Carry on.

 

Yes. It still does the whole manipulation of the brake and throttle “off road cruise control” thing, and the front wheels get independent traction control.

Crawl control and Mts are exclusive of each other. You can’t do both at once, however either works with the locker.

 

If the rear tires are locked, they are both getting full power - matching exactly what the transfercase is putting out, which means no slip to modulate. System can deal with the front tires.

 

+1

 

A locker being locked kind of defeats the purpose of crawl control. But, yes, you can use them together. I'm not sure what would cause CC to deactivate on its own other than eliminating one of the requirements for it to work, such as 4Lo. I don't believe having the rear locked would have stopped it. What year is you truck?

 

2019 off road. I was hung up basically all tires were free flying. I was thinking that because all tires weren’t grabbing anything at all, the crawl control was just free wheeling. Kinda like if you were to put it on block and turn on crawl control??

 

Just checking to see if it was 2020 or later since they nerfed it. Them freewheeling shouldn't matter either since I can't tell you how many videos I've seen of it being exactly like that in the sand. How many times did it stop by itself?

 

A couple times. The truck would shake like it was grabbing something but then just go to deactivate.

 

It did have a hell of a time getting it to lock rear diffs.

 

Locker only engages in 4LO. Did Crawl Control deactivate or did the truck just stop doing anything (thats a big difference). I played a funny joke on my wife many years ago in a different vehicle, I had her drive up a snowy road knowing what would happen. No matter what she did the car slowly came to a complete stop and wouldn't move. The Traction control system had encountered so much slippage it just ground a stop. If the systems can't overcome the conditions they will grind to a halt.

Theres a TFL episode on Youbtube of them testing a 3rd gen Tacoma where CC brings the rig to a complete stop and it won't move. this happened because they had wheels lifting. They engaged the locker and adjusted and it figured itself out and up the hill.

The Crawl/Traction systems rely on SOME resistance. This is also how all LSD's work. They need something to resist to work. Old LSD's you would apply the brake pedal (or parking brake) manually to get them to engage.

 

It should be noted though that the TFL episode you're referring to (if we're talking about the same one) featured the 2020 Tacoma with the nerfed crawl control. They've had no issues with it in prior models.