no 4 wheel drive

[smigie]

hi all well the snow is here at last. went to fetch my daughter back from work thinking i can go anywhere. put the beast in 4 wheel drive on approaching i big hill full of confidence ha ha got stuck half way up no 4 wheel drive.
light is coming on on the dash but no drive to front wheels tried it in low range as well any pointers as to what to look for would be wellcome. terrican 2006 diesel auto
thanks in advance smiggy

[NejcT]

If you have 4wd engaged and the first wheels are not turning, I'm almost sure that you have broken hubs. Terracan has automatic hubs, which are not so reliable like manual one. Take both on the first wheels down and check if you still have all the sprockets inside. If there is no sprockets it means that the hub is slippering inside and 4wd is not engaged.

Buy new one, the best (like i mentioned) are manual one. The only thing at the manual is, that you have to go out everytime, when you engage 4x4. But they last forever.

Best wishes

Nejc

[RBURGOSS]

Originally Posted by smigie

hi all well the snow is here at last. went to fetch my daughter back from work thinking i can go anywhere. put the beast in 4 wheel drive on approaching i big hill full of confidence ha ha got stuck half way up no 4 wheel drive.
light is coming on on the dash but no drive to front wheels tried it in low range as well any pointers as to what to look for would be wellcome. terrican 2006 diesel auto
thanks in advance smiggy

With all due respect for Necjt, I beg to differ here...

Your problem is at the CADS system. The front axle is not engaging. The CADS system need to be checked.

There is a 90% chance the problem is at the CADS solenoids or vacuum lines. Other possibilities include a broken vacuum actuator (inner diaphragm). Actual mechanical problems are very rare with the CAD's system or the Terracan's front axles or hubs.

Here is the service manual pages for it:

[smigie]

thanks for the repl[es will check cads tomorrow do you have a part no for cads please

[Willem Winch]

consider also: if you don't have a locker, the advantage of a "4WD" vehicle on a slippery (ice, snow) hill is limited ... you lose traction on one of the front wheels means you lose the whole 4WD... so the question is: when you got bogged, was one of the front wheels still turning or were both wheels not turning while one of the rear wheels still turned when you tried to accelerate?

if one of the front wheels was still turning while the other was stationary you just lost traction ...that has nothing to do with the CADS or a mechanical failure...

[smigie]

the problem is i have no drive to the front wheels at all in any situation

[Willem Winch]

when you are in 4WD mode: is the front propeller shaft turning? ... if not, there is an issue with the transfer case or the position motor...or the switch... if the shaft turns there is a problem with the CADS (e.g. diaphragm of the actuator, blocked vacuum hoses - ice?)...or the electrical actuator if you have a Highlander version...

[smigie]

going to put it on a ramp tomorrow at my mates garagto check shafts and cads will let u know what i find

[smigie]

4 wheel drive now fixed thanks 4 all your replies in the end it was a easy fix got it on ramp and found no vacume to cads checked all pipes no leaks anywhere.Found a in line valvue on the first pipe from vacume pump took this out of line put in a new lenth of pipe without valvue all now ok. question do i need to put in a new valvue or can i run without it???

[NejcT]

It is great to hear it was a simple solution!

Nejc