3rd Gen ADD fault HELP!

[mckirdy-services]

Hi all

I have had my 3rd gen into 4 garages now including Toyota main dealers however none of them have been able to fix the ADD system on my truck.

I will literally drive it anywhere in England, Scotland, Wales or Ireland to a garage that can fix it.

Please post any recommended garages that could fix the fault (most likely the actuator)

Thanks
Sean

[NiftyNev]

Never worked on one myself but the third generation ADD is a little different to the second generation. Looking at the diagrams, it shouldn't be that difficult to diagnose problems. It's just a process of elimination to find where the fault is. Could be mechanical, electrical or vacuum. The problem these days is finding someone that knows how to diagnose anything.

Nev

[Ava_Banana]

What does it do......what does it not do?

[mckirdy-services]

the light on the dash board flashes as if it is going into or out of 4wd but it does not engage the front drive shaft and the light continously flashes.

It used to work fine.

[NiftyNev]

First thing I would check is the two VSV that operate the ADD. They are somewhere on drivers side I think and should be together. Two hoses will go the the ADD. One will have vacuum when ADD should be engaged and the other when not. If they operate as they should then the problem is the actuator. If not then the fault is before the VSVs.

Nev

[NiftyNev]

Nev

[NiftyNev]

Don't know what happened to that image but if you click on it it seems to be ok when resized.

Nev

[mckirdy-services]

yep both vsv's work and there is a vacume

[mckirdy-services]

Anyone on here fancy some tokens for fixing it?

[lord lucan]

Anyone on here fancy some tokens for fixing it?

if your in east london 9 till 5 weekday i,ll have a butchers 07759 272270 terry

[mud skipper]

how long does the light flash for?

[mckirdy-services]

if your in east london 9 till 5 weekday i,ll have a butchers 07759 272270 terry

thanks, ill text you in the morning.

[mckirdy-services]

how long does the light flash for?

it continously flashes only pauses for a few seconds when the 4wd switch is selected and de selected

[mud skipper]

it continously flashes only pauses for a few seconds when the 4wd switch is selected and de selected

when you select 4wd move the vehicle forward and backward a few yards about 6 times.

this is something i have to do when i get my hands on the surf, after Sally's been doing all her road driveing. it seems to go stiff from the lack of use. if i just select 4wd and drive off then mine wont engage, the light just flashes and if i select 4wd and dont move it just flashes as well.
hope yours is just sticky like mine. once i get mine to engage then its back to normal till Sally does her road miles

[mckirdy-services]

when you select 4wd move the vehicle forward and backward a few yards about 6 times.

this is something i have to do when i get my hands on the surf, after Sally's been doing all her road driveing. it seems to go stiff from the lack of use. if i just select 4wd and drive off then mine wont engage, the light just flashes and if i select 4wd and dont move it just flashes as well.
hope yours is just sticky like mine. once i get mine to engage then its back to normal till Sally does her road miles

That used to work for a while but not any more ;-(