by pass centre diff lock

Submitted: Thursday, Jul 24, 2003 at 20:04
ThreadID: 6157 Views:1964 Replies:5 FollowUps:14
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I have a 2000 manual prado....Does anyone know if it is
possible to bypass the centre diff lock on these things.
What I want to achieve is the use of low range without locking
up the centre diff. As it stands at present, as soon as I select
low range, the centre diff automatically locks.

Can this be done?

Thanks
Jason
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Reply By: Hilly - Thursday, Jul 24, 2003 at 20:11

Thursday, Jul 24, 2003 at 20:11
Don't know how but I'm wondering why?
AnswerID: 25833

Follow Up By: Jason (macca) - Thursday, Jul 24, 2003 at 20:35

Thursday, Jul 24, 2003 at 20:35
Hilly

My drive way is a real pain in the butt to reverse my boat up.
I need to do a 90 degree turn into the garage. I am really giving the clutch a hard time. I am scared of busting something if I use low range noting it automatically locks the centre diff.

Jason
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FollowupID: 17542

Follow Up By: Hilly - Thursday, Jul 24, 2003 at 20:49

Thursday, Jul 24, 2003 at 20:49
Today I have a poverty pack 80 series with manual freewheeling hubs, on occasion I engage low range without the hubs locked for that exact same driveway reason. I haven't broken anything yet.

Tomorrow I'll have a GU with auto locking hubs, not sure what the story will be then.
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FollowupID: 17545

Follow Up By: Jason (macca) - Thursday, Jul 24, 2003 at 21:04

Thursday, Jul 24, 2003 at 21:04
Hilly

Maybe you will be in the same boat as me...I have explored
putting free wheeling hubs on the Prado but have been told
that it cant be done
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FollowupID: 17546

Follow Up By: Michael - Friday, Jul 25, 2003 at 15:40

Friday, Jul 25, 2003 at 15:40
Hilly, you can lock your new Patrol hubs manually BUT ive never tried unlocking them once they are in, interesting... Try it and if you dont break anything, could you please let me know, that concept could be very handy, thanks and best regards , Michael
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FollowupID: 17601

Follow Up By: Member - Bonz (Vic) - Friday, Jul 25, 2003 at 17:04

Friday, Jul 25, 2003 at 17:04
The hubs lock auto, only way to unlock is to reverse in 2wd, unlocking the hubs wont do it, if they are locked manual, all that manual lockin gdoes is give them positive lock.So many places to go!
So much work to do :0(
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FollowupID: 17605

Reply By: Steve from Drive Systems Victoria - Thursday, Jul 24, 2003 at 20:21

Thursday, Jul 24, 2003 at 20:21
Should be possible if you can get hold of the wiring diagram for the lock-circuitry. A switch placed in series should effect want you need.
AnswerID: 25836

Follow Up By: Mick - Saturday, Jul 26, 2003 at 08:20

Saturday, Jul 26, 2003 at 08:20
Only problem Steve is that it's a lever operated lock not electronic. Surprised that a pro didn't know that!
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FollowupID: 17635

Follow Up By: Steve from Drive Systems Victoria - Sunday, Jul 27, 2003 at 09:01

Sunday, Jul 27, 2003 at 09:01
No need to be a smart arse about it Macca. You asked a question, only giving vague clues as to what type of transfer you have, and I offered a suggestion based on the "automatic" assump[tion that it was a push botton 4x4 engagment and was wrong. So, if you know so much about how it is engaged, then fix the bloody thing yourself!
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FollowupID: 17711

Follow Up By: Jason (macca) - Sunday, Jul 27, 2003 at 18:41

Sunday, Jul 27, 2003 at 18:41
Steve,

You should check who posted the follow up before you run off at the mouth. My name is not mick it is macca!!!!!!!!

Thanks for the mouth full of crap anyway and thanks for your
response to my question.
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FollowupID: 17739

Follow Up By: Steve from Drive Systems Victoria - Monday, Jul 28, 2003 at 12:29

Monday, Jul 28, 2003 at 12:29
You're welcome MACCA. Sorry about the confusion!
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FollowupID: 17767

Reply By: Member - DOZER- Thursday, Jul 24, 2003 at 20:42

Thursday, Jul 24, 2003 at 20:42
Jason
i think the prado has thesame as a 80 cruiser transfer, on the rear above the tailshaft should be a switch with wires coming out at the 1 oclock position. Take the plug off and try it in low with ignition on. If the dash light stays off and comes on when you press the centre diff switch, then your laughing.
Done this on mine some time ago for thesame reasons.
Want photos, go to www.lcool.org and look under tech pages.
Andrewwheredayathinkwer mike?
AnswerID: 25839

Follow Up By: Jason (macca) - Thursday, Jul 24, 2003 at 20:46

Thursday, Jul 24, 2003 at 20:46
Andrew,

The 2000 Prado does not have the diff switch on the dash. The earlier models did. I have no idea how the centre diff is activated. As soon as you select low range on the stick, the diff automatically locks up.

Jason

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FollowupID: 17544

Follow Up By: Member - DOZER- Thursday, Jul 24, 2003 at 21:54

Thursday, Jul 24, 2003 at 21:54
OK
2000 models must all have ABS then.
This is how 80 cruisers are aswell. You can get the manual locking switch from Toyota and put it in the ABS 80 dash, plug in the wiring and off you go.
If this is not possble to do on the new Prado, then have a look at a Workshop manual to find the switch on the transfer that tells the ECU the transfer is in low, and put a switch in between one of the two wires that comes out of the transfer switch. You see, when you pull it into low, this transfer switch tells the ecu to lock the ctr diff, it is not locked by the low range lever, but by an electric motor. If you interupt that signal, you will have low range constant 4wd. The other thing you will have is ABS as it doesnt know you are in low range.
I think :-)
Andrew

If the switch still has a place on the dash, then you will findwheredayathinkwer mike?
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FollowupID: 17548

Follow Up By: Jason (macca) - Friday, Jul 25, 2003 at 06:40

Friday, Jul 25, 2003 at 06:40
Andrew,

Thanks for the info. I will make some enquiries over the next few days.
My Prado does not have ABS so there is no problem there

Jason
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FollowupID: 17558

Follow Up By: Member - DOZER- Friday, Jul 25, 2003 at 10:10

Friday, Jul 25, 2003 at 10:10
Jason
there is a 90 series prado list at www.lcool.org out of Melbourne. They would nkow for sure.
Andrewwheredayathinkwer mike?
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FollowupID: 17568

Reply By: Hardy - Friday, Jul 25, 2003 at 12:17

Friday, Jul 25, 2003 at 12:17
I'm glad someone asked this question. Reversing a boat trailor around a cornor or down a boat ramp with other boats waiting can be challenging. The question really is if the mechanism is mechanical or electrical. The other question is why didn't toyota foresee this --- seems obvious to me.
Cheers
AnswerID: 25889

Reply By: Mal58 - Friday, Jul 25, 2003 at 13:15

Friday, Jul 25, 2003 at 13:15
Jason,
There are two versions of transfer case in the Prados. One is mechnically locked by the lever when selecting HL, LL , the other is locked by a switch on the dash board which pulls a solenoid in to lock the transfer case.

If your Prado has the mechanical lock then there is nothing you can do.

If your Prado has the switch on the dash, then I am not sure whether it is as simple as not pressing the switch when engaging the low range lever, or whether a wiring change is required to allow a switch to independently switch in the lock.

I am not sure what models of Prado have the mechanical or the solenoid lock for the transfer case.

Probably a question to ask on the Prado site

http://www.geocities.com/prado_95/90scool.html

Rgds,
Mal58

AnswerID: 25896

Follow Up By: Jason (macca) - Friday, Jul 25, 2003 at 22:28

Friday, Jul 25, 2003 at 22:28
Mal,

Mine is mechanical then. Rats!!!!! Best I buy something else next time

Thanks

Jason
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FollowupID: 17623

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