Forum:
hello,
quick background:- green light DOES come on dash, but no drive to the front prop. No click sound either when button pressed, although hearing that over the noise of the hole in the exhaust would be tricky anyway. The light didn't originally work, but the garage 'rewired' it claiming that it now operates the switch correctly. I thought the light only came on when the box was actually in 4WD, so sounds a but weird?
Having spent lots of time and money on trying to get my 4WD working a 'transmission specialist' has diagnosed the problem to be knackered solenoid(s).
I have taken both off and tried to test them by measuring the resistance across the terminals as i press the pluncher.
results:-
the 4WD 'ON' solenoid (I think - its the one at the front of the transfer box horizontally mounted) => infinite resistance untouched, and 0.1ohms with plunger pressed in.
the 4WD 'OFF' solenoid (mounted vertically at the back of the transfer box) does the total opposite => 0.2ohms-ish untouched and infinite resistance with the plunger pressed in.
Does this prove that they are knackered?
any help would be much appreciated.
many thanks
paul
Fourtrak 'R' reg push button 4WD
4WD solenoids continued....
hello again,
well i think i'm loosing it...
Having had a cup of tea I've realised what i thought were the solenoids (discussed above), i believe are infact detecting switches, for the 4WD green dash light?
Are the 'solenoids' the units that are refered to as the VSV's (vacuum switching valves)?
I'm trying to identify the solenoids and failing miserably, please help.
thanks
paul
Fourtrak F78 'R' reg
yes that is the solenoids,1
yes that is the solenoids,1 wll be open all the time for 2wd with the ignition on then when you select 4wd that one will shut down and the other one will open up.
all they do is control a vacuum systerem that pulls a diaphram in the t box back and forth to select 2 or 4wd
in the secound pic you can see the solenoids
4WD solenoids continued...
thanks guys for the info, very useful.
I've tested the operation of the 2WD-4WD plunger by bypassing the solenoid and it engaged fine.
I've ordered a new solenoid and hopefully = problem solved (maybe wishfull thinking).
will let you know how it goes.
thanks again
Fourtrak F78 'R' reg
4WD UPDATE... HELP......
hello,
well i got the new solenoid and installed it.
Started up and hit the 4WD button = still no 4WD.
while the engine was still running i pulled the incoming -ve air supply off and it clicked into 4WD.
When i then put the tube back on and pressed the 4WD button off and on again, it killed the engine.
Now it won't start and when you turn the key the dash lights don't even come on (water drain light etc..).
Could anyone tell me what i've done, i can't understand how playing with the 4WD solenoids and the -VE supply to them can do this....
any help would be appreinciated.
many thanks
Fourtrak F78 'R' reg
check
fuses
Full of ideas but no time to do them!!
www.bloodredoffroad.com
www.milneroffroad.com
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youtube: Redfourtrack
fuses checked.... thanks
There are 2 inline fuses (15A and 30A) that go to a large relay under the bonnet, which while not black and totally blown are slightly cracked and therefore open circuit. I changed the 15A fuse and made no difference. I will need to buy a 30A fuse tomorrow and change that one too. Hopefully that will bring it back to life?!?
does anyone know what this fuse is for?
All the other fuses in the drivers footwell are ok.
Are there anywhere else i've missed?
What could cause all the dash lights to not work - glow plugs, drain water, handbrake etc..?
The headlights work and to full beam indicator light works on the dash.
It turns over well, but no sign of starting.
I think it cutout when i pressed the 4WD button, but that might have been coincidence.
thanks for your input so far.p
Fourtrak F78 'R' reg
Fourtrak F78 'R' reg
immobiliser?
could it be an immobiliser?
if so, not sure why it would have suddenly kicked in.
Fourtrak F78 'R' reg
running again... but 4WD still won't actuate
disconnected the battery for 30mins and checked the fuses again. found the 'gauge' fuse to be faulty - not sure how i missed that when i tested them all yesterday.
STill haven't changed the 30A fuse though, so don't know what that is for?
Anyway, it now starts and runs again, hooray.
4WD still not kicking in, but i think i may have to setup the vacuum switches as they might have got themselves into a 'funny' state?
I thought if it was just connected up the system would sort itself once the -VE air was pplied via the alternator.
Is it necessary to 'set up' the solenoids/vacuum switches if they have been disconnected and then reconnected?
thanks for your help..
Fourtrak F78 'R' reg
does the solenoids click?? it
does the solenoids click??
it could be that the shaft in the t box is sticking like mine so the vacuum can not pull the diaphram out to pull the shaft in the t box to select 4wd
yes they are clicking...
the 4WD ON (vacuum switch 1) is new and i have just taken out the other one (vacuum switch 2) and tested it with 12v and it clicks.
I am able to make the shaft move to the 4WD position by bypassing the switches and plugging straight into the T box. So i assume the diaphram will move when the correct pressure is applied.
I've tested the 4L and N switches by measuring the resistance across the terminals as the plunger is pressed and they seem fine.
If the vac switches are in working order and the 4L and N switches are also in working order, the only thing i can think is wrong is perhaps the vac switches need 'setting up' so they have -VE pressure in the right place when it is connected up again.
Do you have to start it up and then put on the hoses in a certain order to ensure the vac switches are set correctly?
this is beginning to drive me mad....
thanks for your help.
Fourtrak F78 'R' reg
no you dont need to set them
no you dont need to set them up.
take the cover off like in one of the pics i put up to see if the shaft is stuck
will do... thanks
i'll hopefully be able to try that on tuesday, will let you know how it goes.
Fourtrak F78 'R' reg
another thing to cheack is
another thing to cheack is that you are getting a vacuum though the pipes
update...
thanks for your suggestions, I did some more diagnoses today...
* the 2WD-4WD shaft moves and engages the front prop fine, when -VE pressure is applied to the relevant end of the chamber that controls the shaft (bypassing the VSV's). Therefore i'm confident that the issue is with the vacuum switch(s)
I think there may be a problem with VSV 2 (VSV 1 has been replaced already). When the vacuum switches are all connected up, just leaving off the 2 tubes going to the chamber controlling the 2WD-4WD shaft:-
2WD selected => good -VE pressure at the correect tube
4WD selected => -VE pressure at the correct tube, but very weak (would not strong enough to pull the shaft into the 4WD position).
I think though this switch (VSV1) with the weak -VE pressure is working ok (it's brand new), so i think the problem might be with the other switch, not turning off it's vacuum, which is not allowing VSV1 (4WD ON) enough -VE pressure.
does that make any sense?
I tested VSV2 out of the car using a battery, and it clicks and i can blow air though it when energised, so appears to be working, BUT is it possible that at a higher -VE pressure it may fail/leak, which does not show itself by just blowing into it?
Any way, i'm going to try and change the connector of another VSV i have (hopefully it works) in the next couple of days, in place of VSV2. Will let you know how it goes when i do.
Fourtrak F78 'R' reg
4WD FIXED !!
hello,
just to reprot that the solenoids are now working and the 4WD is working. I replaced both solenoids in the end and the 2nd (pulls the plunger into 2WD) was stuck open. It was brand new, but sucking hard whilst applying 12v freed it up and it now operates correctly.
I think i also have a wiring issue ( a short somewhere), which was what was causing the fuse to blow (see earlier in this post string). I have not tracked down the culprit yet, but when i move the fuse box and 4WD relay in the foot well, i think something is shorting. Ihave it in a osition which is fine at the moment, which is were it will stay, until i have time to trace it.
Thank you all for your input and support.
until the next time.
Fourtrak F78 'R' reg
another thing to cheack is
another thing to cheack is that you are getting a vacuum though the pipes
did ye not look at your other
did ye not look at your other thread....................
there are 2 on the drivers
Submitted by ian on Mon, 14/02/2011 - 20:08.
there are 2 on the drivers side of the gearbox high up if you lie under neath you can see small black rubber pipes ,going into them very fiddly but can be done ,can of wd40 with straw try and get pipes of and start it up ticking over fine and spray the wd in the pipe or the solinoid ,this has worked or me on a few ocasssions seems to be when fourtrac is laid up for a bit,try it and save a few bob.if it works mind and press the button once and a while to keep it free.
4WD solenoids continued...
thanks guys for the info, very useful.
I've tested the operation of the 2WD-4WD plunger by bypassing the solenoid and it engaged fine.
I've ordered a new solenoid and hopefully = problem solved (maybe wishfull thinking).
will let you know how it goes.
thanks again
Fourtrak F78 'R' reg
checked fuses... thanks
There are 2 inline fuses (15A and 30A) that go to a large relay under the bonnet, which while not black and totally blown are slightly cracked and therefore open circuit. I changed the 15A fuse and made no difference. I will need to buy a 30A fuse tomorrow and change that one too. Hopefully that will bring it back to life?!?
does anyone know what this fuse is for?
All the other fuses in the drivers footwell are ok.
Are there anywhere else i've missed?
What could cause all the dash lights to not work - glow plugs, drain water, handbrake etc..?
The headlights work and to full beam indicator light works on the dash.
It turns over well, but no sign of starting.
I think it cutout when i pressed the 4WD button, but that might have been coincidence.
thanks for your input so far.p
Fourtrak F78 'R' reg
4wd problems
Hey
i am at a loss to why my diahatsu Ruggers front wheels wont work in 4wd. I have applied air to the vaccume hose (as the vacuume is not working :S thinking a solonoid maybe) which forces diaphragm forward engadging my 4wd light on the gadge and engadging the front prop however as soon as i take away the air the front prop will stop spinning and dash light will go off. Is there some sort of locking mechanism that is not working ??. i have dismantled another transfer case on a replica wrecked rugger and when i apply air to the vac hose the diaphragm stays in 4wd mode until i apply air to the opposite hose. therefore i believe the locking mechanism is funtional in this vehicles transfer case and not the first mentioned.
sorry if i confused you all
thanks