newbie 4wd problem with pics

[iliketwopointeights]

Hi
I have just got a k plate 2.8D 4runner
Unfortunately i dont seem to be able to get 4wd
I have read all the post about checking the vacum pipes and the following images show where there might be somthing missing. I cat here any click (apart from switch on knob) when i try and select 4wd nor does the light come on.

Theres this one on the driver side, this thingy is flapping about and look like it once had a vacum pipe on it.


Or this one on the passenger side (not very clear) again looks like it shoul have a vacum on it.


If i get a volt meter can i tell if the solenoid on the front diff is getting 12v whilst the car is stood still?

If anyone can answer any of these question it would be much appreciated and hopefully help people in the future
Cheers
Jos

[MudSurfer]

Second pic isn't part of the 4WD system, so don't worry about that bit...

The first one looks like one of the VSVs....I'll have to go away and find the diagram, but you should have two, one blue, one brown on the LHS (as you stand in front of the truck) between the brake servo (big round black thing) and the battery.

I'll see if I can find the diagram that shows you how they all connect.....

Could you take another pic of the whole of the LHS of the engine bay and I'll draw it on there for you

[iliketwopointeights]

Second pic isn't part of the 4WD system, so don't worry about that bit...

The first one looks like one of the VSVs....I'll have to go away and find the diagram, but you should have two, one blue, one brown on the LHS (as you stand in front of the truck) between the brake servo (big round black thing) and the battery.

I'll see if I can find the diagram that shows you how they all connect.....

Could you take another pic of the whole of the LHS of the engine bay and I'll draw it on there for you

Hi
Yeah the other two are on the top right of pic one they are nicely secured to the wing. They seem fine and i have checked the hoses from them.

The only other thing we thought it might be is the wire that goes into the from of the front diff has no guard on it and i went through a puddle and it got ####ed wet through. I have tried to check the fuses and they all seem ok , but i could find one that said it was for the 4wd system. I heard there was a relay for the system but i am not sure what number or how to test it.

There is a bigger pic of the drivers side engine bay here but its very big

[MudSurfer]

Right - while I think about stuff, have a look over this little lot...

http://www.off-road.com/trucks4x4/ar....jsp?id=399612

On the front diff there is a switch, that youmay want to clean up if it's getting gunge etc in it - under the truck on the transmission you'll find two more at the top and one just where the transfer case meets the transmission - check the connectors first - the two on top of the transmission are white and blue - just pull the plugs apart, check the voltage to them, and give them a squirt of WD40 or similar (there are other water dispersant products available )

Then do the same with the one where the transfer meets the transmission - all are accessible by getting to the from the passenger side.

If these all check out, and you get voltage when you should, then you'll need a 27mm open spanner, and remove the one by the transfer and check that the voltage gets to the switch, and not just the connector.

If this doesn't work, check the connector at the very back of the transfer case - same as above.

If that doesn't work, there are 4 bolts on a 'square' plate on the RHS of the transfer case at the back, undo these and take the cover off - it should be clean but with gold and or white coloured grease in there - if it's all full of crap, then clean it out and regrease and put the cover back on. (this is the transfer engage motor)

If none of this works, check under the drivers side wheel arch, your's may have a vacuum tank there (the 2.4 does, not sure on the 2.8) - check that the pipe between here, the brake servo and VSVs is intact.

Also check the pipe going to the alternator....

With the engine off, but ignition on, see if you can here the transfer try to engage after you've done all of this.....

[iliketwopointeights]

Cheers mate that great info.
Just one question, Should these connectors be getting 12v with just the ignition on or just when the 4wd button is pressed?
cheers
Jos

[NiftyNev]

Second pic.

Nev

[NiftyNev]

Another Diagram for the ADD VSVs.

Nev

[NiftyNev]

The other VSV with a missing hose could be the Air Con idle up. Look for a vacuum operated gizmo on the fuel pump or somehere nearby for a vacuum hose connection. I'm not sure of this so if there is a connection there somewhere run a vacuum hose from the VSV to it and see what happens when the air con is switched on.

Nev

[iliketwopointeights]

Ok I have done my tests with the ignition on and 4wd button pressed in.
The only sign of life is from ONE of the terminals in the brown thingy in pic one that is connected to the wing. I dont get anything from the blue one, or the two connectors on the front diff/transfer thingy.
Unfortunately i am not sure if i should be test with the engine running or what this means. Anyone know if this is a good or bad sign ?

[MudSurfer]

It's a good idea to test with the engine running as this will start creating vacuum, if you test the system with just the ignition on it will us the remaining vacuum in the system.

When you test the VSVs - you'll get voltage on one at a time, so grab a passer by and ask them to press the button in and out - as one will engage, the other will disengage.

I have a pair of VSVs at home somewhere, but it's highly unlikely to be them.

If you've checked all the other bits from my other post, and had a look over the diagrams that Nev posted, then make sure you can see that the vacuum pipes go all the way from one end to the other...

[iliketwopointeights]

It's a good idea to test with the engine running as this will start creating vacuum, if you test the system with just the ignition on it will us the remaining vacuum in the system.

Would the fact that the battery has been flat for ages effect the 4wd as i have just had the alternator belt fixed. also it has wrong battery would that effect it, the engine fires up well now, just no 4wd

[MudSurfer]

Would the fact that the battery has been flat for ages effect the 4wd as i have just had the alternator belt fixed. also it has wrong battery would that effect it, the engine fires up well now, just no 4wd

No - but if you were working on the alternator, make sure you've got the belt tight and the vacuum pipes are all connected properly

Do you get any sound from it at all? Mine used to click the relay on and off all the time..

[iliketwopointeights]

nope no sound from above the pedals at all, just a click on the actual button, that the only sound i get. Think i am going try and find a 4x4 specialist as i havent got a clue

[iliketwopointeights]

Does anyone know what the relay that controls the ADD looks like or what its called so i can try replacing that
cheers
jos

[iliketwopointeights]

I have tested the connector at the fron of the diff with the engine running and 4wd button pressed in and got nothing. I took one of the pipes of the brown thingy and it hissed as if it was sucking, but the when i treid it agian it didnt do anything. I am still concerned about the part in pic one that look like it should have a pipe on it because that is connect to the other vacum pipes, so i am going to try and block it for now