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No 4WD when cold

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05 Mar 2018 13:40 #189969 by kayjay
No 4WD when cold was created by kayjay
Annoyingly the 4WD on my 2006 Jimny works fine except in very cold temperatures (subzero). I have read all the great info online and understand how it all works. I conclude that it (flashing light & no 4WD) is due to lack of vacuum. Has anyone encountered this low temperature issue before and maybe found the cause. If not I conclude I must go with freewheel hubs as the risk of no 4WD when I need it most it too high. When this happens diagnostics are not practical.

Thanks

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  • Lambert
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05 Mar 2018 16:33 #189979 by Lambert
Replied by Lambert on topic No 4WD when cold
You could have a bit of water in the lines and it is freezing?

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05 Mar 2018 16:51 #189980 by kayjay
Replied by kayjay on topic No 4WD when cold
So that would have to be somewhere between the switch and the vacuum take of point rather than switch and hubs?

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05 Mar 2018 17:25 #189982 by mlines
Replied by mlines on topic Re:No 4WD when cold
Too much grease in the hubs ( grease goes thicker in the cold)

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2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
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05 Mar 2018 17:30 #189983 by kayjay
Replied by kayjay on topic Re:No 4WD when cold
I don't believe thick grease would prevent the vacuum forming and activating the switch. It may stop the splines engaging.

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05 Mar 2018 17:45 - 05 Mar 2018 17:45 #189985 by mlines
Replied by mlines on topic Re:No 4WD when cold
It stops the sliders sliding and it helps the seals

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Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
Last edit: 05 Mar 2018 17:45 by mlines.

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05 Mar 2018 17:51 #189986 by Busta
Replied by Busta on topic No 4WD when cold
kayjay, you are correct. The system would not detect if the hubs hadn't engaged due to frozen lines to the hubs or over greased hubs. It would see that sufficient vacuum was maintained for the set period of time and therefore assume that the hubs had engaged correctly. Unless the solenoids themselves are freezing, I'm at a loss as to how cold weather could cause the system not to operate correctly.

Have you checked the prop is engaging? I'm not familiar with the exact process in the electric transfer cases but could it see a fault at the transfer box end and call it quits before even activating the vacuum?

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05 Mar 2018 17:57 #189987 by kayjay
Replied by kayjay on topic No 4WD when cold
It seems that the prop is engaged. In any case the green light is out until the transfer box signals that the front prop is engaged, only then does the green light come on flashing until the pressure switch signals vacuum OK

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05 Mar 2018 21:40 #190002 by Busta
Replied by Busta on topic No 4WD when cold
I'd play about with a few of the vacuum pipes, checking if there is 'suction' at various points in the system by putting your finger over the end while an assistant fiddles with the controls. You could also try by-passing the controller completely, plugging the vacuum line from the intake straight into the lines down to the hubs. It might give you some clues!

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05 Mar 2018 22:10 #190004 by kayjay
Replied by kayjay on topic No 4WD when cold
Not really practical in sub zero temperatures unfortunately. I guess my only sensible option is to install freewheel hubs. I see that the AVM457 are a common option but jimnybits do an unbranded version that looks identical they claim does the same job and is considerably cheaper. Has anyone tried them, if so what is the quality like?

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05 Mar 2018 22:34 #190006 by kirkynut
Replied by kirkynut on topic No 4WD when cold
I appreciate everyone is trying to help but unless it's all stripped down they are just wild guesses. It could be that the rubbercseal in the hub shrinks or goes hard and leaks the vacuum too.

You are right in my m8nd to just get freewheeling hubs.

If you can afford the AVM hubs, get them. If you don't do much in 4wd and have a standard Jimny the others ought to do the job.

Kirkynut

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