should it suck? solenoids question

[tomiasorensen]

Hi,

I posted a problem with 4X4 not working a few weeks ago and have been underneath to haev a little look. I wanted to check something out.
The TOD vacum thing on the front axel has 2 solenoids which presumabley apply a vacum to one side or the other of the diaphram. On my car, not matter what position the various buttons and leavers are I only get a vacum being applied to one side of the diaphram. One solenoid is not doing it at all. There is a vacum on the other side of the solenoid so its getting to it but not anyfurther. IS this normal? does the car have to be moving or something for this to be activated or is this in fact the problem? I wiggled things and tapped things fairly enthusiasticaly to no avail.
Does anyone no what pipe is meant to be doign what at what time?

T

[pig75]

Sounds like you have shift on the fly not TOD
These might help

fiy.jpg

This is TOD

tod.jpg

[tomiasorensen]

Sorry yes it is SOTF. Erm Sorry I dont understand this, will it tell me which pipe shoudl suck adn when?

[pig75]

The grey valve puts it in 4wd the blue one takes it out of 4wd

[pig75]

If you have the work shop manual for your Trooper go too section 4B1 all the info is in there

[tomiasorensen]

Ahhh perfect thanks, looks like its that solenoid then. I haev seen a thing on how to service them on here somewhere, I'll go mess with it.
Thanks lots, I am bit thick when it comes to diagrams, wierd for an Architect you may think... and you would be right!