4WD not working :(

[fazLN130]

Hello friends,
I have just purchased a 1992 K reg Surf 2.4td, its only got 76000 KM (58000 miles) on the clock, I am quite happy with the beast apart from one thing....the 4WD system seems to have an issue. Every time I press the 4WD switch I hear a relay click and there is a clonk noise underneath...but the 4WD light only appears for 1 second !!!

Has anybody got any idea whats wrong? If I remove a vacuum pipe from a little relay/switch under the bonnet (next to the drivers front wing) and then try selecting 4WD the light comes on and stays on, but if I reconnect the vacuum pipe the 4WD only stays on for 1 second please advice
Many thanks in advance
Faz

[BUSHWHACKER]

For the 4wd system to fully engage, and the indicator light on the dash to stay lit, you need to drive forwards or reverse a couple of feet.

[fazLN130]

Still doesnt work driving forward or in reverse has no affect, I got stuck in mud and tried selecting 4wd only the back wheels were spinning.

[BUSHWHACKER]

Heres some info for you to trouble shoot, probably easier than playing forum 'Tennis'!

http://www.toyotasurf.asn.au/techsite/add.htm

[fazLN130]

Thanks for the advice and links. I have managed to sort it out it was very easy!
I removed an earth cable cleaned the contact and sprayed WD40 on it before refitiing it. The earth cable is on the drivers side inner wing. It worked for me. I can now switch from 2WD to 4WD using the switch.