4x4 not Engaging

Does anybody know if your speed sensor on each tire have anything to do with your 4x4???

 

Usually if ECU doesn't know how fast you are going that could cause the 4x4 not to engage. Doesn't have to be all 4 of them one will shut it down. Is the check engine lite illuminated?

 

I was thinking the 4x4 actuator.

 

No but 4x4 will not engage but I took my actuator off n the post where connected so I know my actuator is working fine so don't know

 

The first time I used it after hurricane Harvey which I went through a lot of water both my hi and low light where flash that the same time but my 4x4 did not engage

 

Sounds like the vacuum actuator line.You went through high water and either knocked it off or clogged it.

 

Hey man I had a chance to look at my vacuum holes an the one that goes to my tcase was crack do think this where it leaking

 

Is it cracked such that you can't cut it off and still have some hose left to stretch it?

 

Yea I got Enough hose to cut it But do you think this might be the problem That it letting vacuum out and not causing it to engage

 

I don't know. Go take it for a ride after you trim the hose back to remove the cracked section.
Let us know the outcome.

 

On my Tundra, if you have a bad speed sensor, 4wheel drive will not engage.

I'm pretty sure the Tacoma uses the same system.

 

On those speed sensor it just got to be one of them to go wrong for it to not work right

 

Correct, just takes one.

 

Ok I think that might the problem then can I when through a lot of Water in hurricane Harvey And the first time I try to use after that it didn’t work on me

 

I cut one of the wires that feed the rear speed sensor on my Tundra. 4 wheel drive was not available.

Soldered the wire back together and all is good.

 

Check the wires, it's the weakest link.

 

What vacuum lines are you talking about?

 

Are we discussing the 4wd system in a 2nd gen Tacoma here? Is it not vacuum actuated and the speed sensor is in the transmission not on each of the 4 wheels.

 

Correct!

Op, I posted basically the same response in your other thread on this issue. 4WD is electrically actuated on the 2nd gens.

https://www.tacomaworld.com/threads/4x4-vacuum-hose.522378/

 

Yea it a 06