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TacomaGeneral discussion forum for the 2005 and later Toyota Tacoma.
This is a discussion thread titled "Locker mod?", within the Tacoma forum, part of the Truck Forums category.
I have stared at the schematics for hours man. It seems easy, but the ecu, 4wd computer, and abs systems are all intermingled and it gets confusing. I think we should be able to trick the computer by telling the ecu we are in 4LO, but how do you do that without sending the signal to the transfer case? man I would pay to find out.
I would also pay to find out. I would also spend hours looking at the schematics if I thought I could understand them. If the locker disabled the anti-lock brakes, that wouldn't be a big issue because they are already turned-off when you use the e-locker in 4LO.
The more I think about it, the more I'm frustrated because it seems like such a useful feature in 2HI or 4HI.
Makes you really drool over the new FJ features doesn't it
Not to flame or anything, but no....
I wish they would have called it something else like the RAV7 or something.
Just like when VW remade the New Beetle and embarrassed all the vintage VW owners, I think the FJ will do the same by sharing its namesake with the greatness of the OLD FJ....
And then to incorporate the word "Cruiser" is like insult to injury..
FJ Cruiser
PT Cruiser
It's a Metrosexual concept that has made its way into production IMHO.
Haha! Styling may be retro and I think they say "Cruiser" to also appeal to the general public. Like it or not if Toyota built a truck JUST for true off-roaders they wouldn't sell enough to be truely profitable. So there alternative is to build a vehicle that is appealing to not only off roaders but the general public in its stock form. Like the looks or not, the new FJ comes with a helluva lot of options I would lOVE to see on my Tacoma that's for sure and alot of options off roaders love to see without having to mod it to death. But I agree it isn't for everyone.
I have stared at the schematics for hours man. It seems easy, but the ecu, 4wd computer, and abs systems are all intermingled and it gets confusing. I think we should be able to trick the computer by telling the ecu we are in 4LO, but how do you do that without sending the signal to the transfer case? man I would pay to find out.
Here's an Idea... I have nothing better to do at work then spend 5-8 hours a day wasting (a-hem! passing) the time w/ internet, reading a book, etc, etc, on a regular basis (Gov't work). I've spent allot of it researching my Tacoma, mods, maintenace/repair issues, among other things. I don't have a repair/service manual (actually don't have my truck yet either! But give me a few months)
So If you could Post/Send me a few scans of the wiring diagram for the 4WD, ABS, TRAC systems, etc. Also include whatever info you might know already about the wiring/control units that may not be mentioned in the maunal. and I'll "waste" those hours doing something constructive and help figure out a solution. (Then I'll already know how when I get mine.) By the way, I work with a ton of engineers (all disciplines) who have nothing better to do most the time either. I'm sure I can get help when needed!
If it takes 50 relays to make it work, I'll figure out something!
(Or get an electrical/computer engineer to help me design a new control unit or something!)
There semes to be two threads aobut this. I had a frontier and I fond this ink on how to mod the Titans and Frontiers. It should be a simular principal on how to get it to work on the tacos.
Please remember this is for a Frontier but it should give you the ideas. If I had wireing dirgrams I could work it out. But I cant get them intill tomorrow off of all data at work if it has them. http://austinm.net/titan/frontyelock/
check it out
__________________
Jeff
07 Dodge Ram 6.7l cummins 6spd (on order)
05 DC Limited, nav, DVD, leather (sold)
05 Nismo Frontier, traded due to problems
03 Triumph Sprint S/T motorcycle
A Nissan Tech driving a Toyota
Has anyone compared the ARB air locker to the factory e-locker as to durability and performance? The ARB is a conventional diff when unlocked and can be turned on in any gear. Does anyone have an exploded view of the factory unit or photos along with an explanation of how it works?
Not to be sac-religious, but I believe that we've just found our proverbial rear-diff savior in Soup. This guy's got both the drive and the know-how. How could we not take him up on this offer?
If someone hasn't already got the stuff you need for you, let me know exactly what you need. As a subscriber, I think I have access to it don't I? And I think it's ok to pass on isn't it? Looking for a little guidance here...
Sounds good. And yes you should have full access as a subscriber and I don't see a problem with sharing the information especially since this would be a mod that many many will be interested in. You're talking about just among fellow members correct?
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That stuff is on TS? Didn't know that... I wouldn't have asked someone to steal from TS. I just thought someone might be able to scan a manual or something...
Well, since I am getting my new Taco in about 3-4 months, maybe I ought to just subscribe and DL all the stuff myself.
Not to be sac-religious, but I believe that we've just found our proverbial rear-diff savior in Soup. This guy's got both the drive and the know-how. How could we not take him up on this offer?
If someone hasn't already got the stuff you need for you, let me know exactly what you need. As a subscriber, I think I have access to it don't I? And I think it's ok to pass on isn't it? Looking for a little guidance here...
^^^As you can now see... I have FULL ACCESS! New Subscriber! *woot, woot*
I have everything I can get off TS (unless there is more stuff hiding, scattered throught the forums).
I wouldn't put to much hope in me, though. I'll figure out what I can. I'm not an engineer myself (data analyst), but I know how to read the diagrams, and I have PLENTY of time to do it. Only problem is, I don't have a Taco to do any testing or take voltmeter readings or anything. So until I do, anything I come up with will simply be "theory" until it is actually tested. Somebody else will have to be the guinea pig until I get mine, but at your own risk of course.
I've been looking and analyzing the wiring diagrams for hours. Comparing, thinking, contemplating... seem to have a good grasp on how the systems work together. I can't begin to guess how the 4WD computer actually reads all the sensor inputs and stuff to determine everything is working properly...
With all that said...
You have to bypass the actuator controls WITHOUT bypassing the sensors. (so you cannot simply just ground out anything or hook two wires together, a litle more complicated than that). Since the power/polarity to the locker actuator is reversed to disengage the locker, I would think a rocker switch would work fine. Similar to the "05 Frontier locker mod" I saw posted around here somewhere. However this does leave a few unknow variables... You can look at wiring diagrams all day, but that won't tell you how the ECU, 4WD CU, and other onboard computers react to the input from the different sensors. If you engage it manually, Does the computer read the indicator switch and tripp an error since it only supposed to workin in 4LO? Or does that only apply to the actuator circuit? What about other sensors configurations? Does it check the actuator? the 4WD switch position? The 4WD CU itself is what limits the actuator to 4LO. So even if you can lock the diff, I don't know how the computer will react to the sensor inputs in any mode besides 4LO.
Assuming it works...
It would have to be engaged manually with a switch (and disengaged the same way). Only problem with that is, if it doesn't go in right away, you won't have a computer to keep trying automtically until the indicator switch tells it it's in. You would have to keep pushing it or hold it until the indicator light comes on. The ABS, VSC functions are just controled by the ECU and the indicator switches. Leave all the sensors intact, and your ABS, VSC, etc should still disable as normal. Also by putting in a manual switch, you would not have the safety features enabled to keep you from accidentally engaging it while at highways speeds!
In short, if you bypas the computer, you won't be able to use the factory Diff lock button. You'll have to use something else like a rocker switch (or wire up 2 of them...one to engage, one to disengage.) And pray the computer doesn't spit back errors at you. You'll only know by trying it. If I had my truck I'd do it myself. But if someone wants to try, I'll provide any input I can. However, you must have a full understanding of what you are doing since I will not be held responsible, for any resulting damage or error.
Alternatively... a more expensive, but factory-look solution came to mind....
The Prerunner uses a different Control unit than the 4WD models. However it's still called a 4wd control unit... Imagine that! and controls the same safety functions the 4WD model does when the locker is engaged. (disables ABS, VSC, etc).
The prerunner engages the locker regardless of 4WD mode, because it doesn't have it, due to a different control unit... DuH! I know you knew that.
The 4X4 can engage 4WD in any mode WITHOUT the locker just not with it. Again you knew that...
Why not have 2 computers? One from the Prerunner, wired up to the locker. And the other 4WD ECU to control the drive mode. Completely disconnect the e-lock switch and actuator, and indicator switch from the 4WD CU (don't want to confuse it) so it NEVER senses that it's active, and hook them up the the Prerunner CU which will send any neccesary info to the other onboard computers. The 4WD computer should work fine on it's own without the e-locker connected.
The trick is, the Prerunner CU needs to be sliced into some of the same wires that the 4WD CU uses to communicate with the ECU, SKU, ABS, etc. But you don't want each CU tripping sensors and stuff on the other one. The solution would be to use diodes to isolate each computer from tripping the other one, but still using the same wires to transmit signals to the other onboard computers.
Personally I like this idea better, since it still enables you to use the factory switches, and keeps all the safety features intact to keep you from accidentally engaging soemthing you don't want. Would be quite a bit more expensive since you have to buy a second computer from a Prerunner as well as the wiring harness to plug into it. I haven't checked and have no idea what another 4WD computer would sell for... But I know I could get it to work.
Locker mod?
. I've spent allot of it researching my Tacoma, mods, maintenace/repair issues, among other things. I don't have a repair/service manual (actually don't have my truck yet either! 
But give me a few months) 
Locker mod possibilities
The 4WD CU itself is what limits the actuator to 4LO. So even if you can lock the diff, I don't know how the computer will react to the sensor inputs in any mode besides 4LO.
Linear Mode
