multi mode transfer case question

Yotaoffroad27

Yotaoffroad27

New member
Ok, Back story. I have a 99 Tacoma with an 02 Tundra V8. Its mated to a v6 Tacoma R150 Manual trans. All of this runs out through a FJ80 E-locker axle. I am wanting to add to my "Hybrid" a 99 4runner multi mode T-case. I want this T-case because it has the J-Shift pattern (same as the 00). I am trying to run this t-case with the 01-02 4wd ECU. The reason for this is I want to run na electronic actuated ADD front diff instead of the vacuum actuated diff Toyota used up through 2000.

I have spent a few hours looking at, and comparing the 99-00 ECU wring to the 01-02 ecu. The only thing that is different is the way the front diff is controlled. everything on the T-case is basically the same.

I have everything wired up on my bench to test the functionality of the system. At this moment, when I push the 4wd button on the shift knob the center diff locks and the t-case goes into 4wd. What should happen is the Center diff stays open, but the case goes into 4wd. When the button is released, nothing happens. The only way I can get the case back to 2wd is the manually apply power to the pins on the motor to back it up. The same thing happens when I put the case into Low range. both times the Center diff light, and 4wd light flash non stopped.

I am 98% sure I have this thing wired up correctly. The only thing I dont have wired in is the front diff. It is installed in my truck. I could pull it from my truck, or put together a small harness that would reach, but I dont really want to go through all that yet.


I am wondering if ANYONE with01-02 a multi mode 4runner would be willing to unplug the front diff and try to engage the t-case.


[MENTION=59542]Singtoe[/MENTION]
 
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Multi mode cases aren't j shifts they are push button awd and have push button 4wd and the shifter is for h and l
 
541joseph said:
Multi mode cases aren't j shifts they are push button awd and have push button 4wd and the shifter is for h and l
Click to expand...


I know mine was a j-shift with the push button.

The button activates the front diff and the CLD.

Get ahold of [MENTION=59542]Singtoe[/MENTION]. He might be able to help ya out a little more with the wiring, seeing as how he mated one to the Sequoia trans.
 
541joseph said:
Multi mode cases aren't j shifts they are push button awd and have push button 4wd and the shifter is for h and l
Click to expand...

This is incorrect J shift is multi mode just a different flavor of it.

4-Ripcord said:
-In ’99-’00, the limited upgraded from a standard transfer case with push button, over to a differential type transfer case (known as Multi-Mode). This type of transfer case still has a push button to engage 4wd from 2wd. A differential type t-case is different from a standard t-case in that the front and rear drive shafts could rotate independent of each other and avoid binding on high traction surfaces. Until this center differential was locked, the vehicle is essentially in all wheel drive (discussed more below).
To lock the T-case, you simply shift from 4Hi to 4Hi(L).

-In 2001 and 2002, all models gained these Multi-Mode transfer cases (including limited, now they all have the same system). But, the locking method changed from a separate shifting position to a separate push button on the dash.


http://www.toyota-4runner.org/3rd-g...rs-3rd-gens-transfer-case-awd-multi-mode.html
I HIGHLY encourage you to read this thread skillfully written by Brian2sun. It is more in depth and contains information such as recommended speeds, shifting configurations, Pictures, Uses, and more differences.
The information above is a summary of the information in his thread.
Click to expand...
 
You need the front diff hooked up. The ECU see's a problem and does not try to do anything.

Make a long extension cord and plug it in to your front diff. And then bench test it...
 
My question is how have you addressed the differences in the ECU and CDL? In the older multi modes with J shift the CDL and ADD automatically engaged itself depending on which position the J shift was positioned in. In the 01-02 the CDL is activated by the dash mounted switch. Does what im asking make sense?
 
nor_cal51501 said:
My question is how have you addressed the differences in the ECU and CDL? In the older multi modes with J shift the CDL and ADD automatically engaged itself depending on which position the J shift was positioned in. In the 01-02 the CDL is activated by the dash mounted switch. Does what im asking make sense?
Click to expand...

I don't have the EWDs on me right now, but I would suspect that the shift position switches are similar or the same. The ECU knows what gear it's in based on switches installed on the transfer case. Thus lever or switch, the ECU verifies what position the transfer case is in before activating the ADD, if the ADD does not respond or the circuit is not hooked up; the transfer case should default to the open position in an attempt to save itself from possible damage. At least that is how most of our electronic transfer cases with these days.
 
BlackWorksInc said:
I don't have the EWDs on me right now, but I would suspect that the shift position switches are similar or the same. The ECU knows what gear it's in based on switches installed on the transfer case. Thus lever or switch, the ECU verifies what position the transfer case is in before activating the ADD, if the ADD does not respond or the circuit is not hooked up; the transfer case should default to the open position in an attempt to save itself from possible damage. At least that is how most of our electronic transfer cases with these days.
Click to expand...

Makes sense, but the issue im seeing is that in the J shift models with multi mode they have a switch/sensor on the shifter or transfer case I would assume that recognizes the different shift placement to engage the CDL. On the 01-02's its not automatic. I bring this up because I would think the OP's problem lies in that area of his wiring the ECU to the older style J shift switch/sensor for CDL. :confused:
 
nor_cal51501 said:
Makes sense, but the issue im seeing is that in the J shift models with multi mode they have a switch/sensor on the shifter or transfer case I would assume that recognizes the different shift placement to engage the CDL. On the 01-02's its not automatic. I bring this up because I would think the OP's problem lies in that area of his wiring the ECU to the older style J shift switch/sensor for CDL. :confused:
Click to expand...

Not automatic?

The only thing really different between the 99-00 and the 01-02 is that the early ones used a lever to engage a switch and the 01-02 uses a button.

The automatic part is that the 99-00 will stay locked when the 4runner is shut off and then restarted while the 01-02 will automatically unlock when it is shut off and started back up.

I have a 100% faith in the OP's wiring skills and figuring out this issue was a simple forum favor. Can some one take their 01-02 4runner and unplug the front diff actuator and see if the transfer case will still work.
 
Singtoe said:
Not automatic?

The only thing really different between the 99-00 and the 01-02 is that the early ones used a lever to engage a switch and the 01-02 uses a button.

The automatic part is that the 99-00 will stay locked when the 4runner is shut off and then restarted while the 01-02 will automatically unlock when it is shut off and started back up.

I have a 100% faith in the OP's wiring skills and figuring out this issue was a simple forum favor. Can some one take their 01-02 4runner and unplug the front diff actuator and see if the transfer case will still work.
Click to expand...

[MENTION=59542]Singtoe[/MENTION] is right. I wish I could figure out how to post what i am looking at. If you saw the diagrams, you could see that the switches used to activate the t-case are all the same. They are just in different forms, and placed in different spots.I.E. 99-00 switches in on the case, 01-02 switch in the dash. When looking at the diagrams they look almost the same, except the wiring from the front diff.

I was pretty sure I had it figured out, but when things didnt go as planned I pulled all my wiring apart and started looking for my mistake. I ended up with the same wiring as before, and the same results. That is when I started to wonder if the diff needed to be wired in. I found the plug I needed, and it is on its way to me now. Once it is here, I will get this figured out.

This is why I like t4r... Plenty of discussion to be had. :first:
 
Well, I'm glad its something simple at least. I can unplug my front diff later this evening and give you the heads up on how it effects the system if you would like.
 
nor_cal51501 said:
Well, I'm glad its something simple at least. I can unplug my front diff later this evening and give you the heads up on how it effects the system if you would like.
Click to expand...


The last plug I needed showed up today. After quickly connecting the 6 diff actuator wires I was in business.

Everything works great... With one flaw.


If the case is in 2wd, and I pull the lever back into H4L (normal 4x4) Nothing happens. If the case is in 2wd, and I pull the shifter back into H4L, then back to 2wd, then back to H4L the case goes into 4wd...


If the case in 2wd, and push the 4wd button on the shifter the case shifts into AWD, and the front diff locks. If I go from AWD, to H4L the center diff locks, and the case is in 4WD. If I go back to 2wd with by moving the stick forward, nothing happens. Once I depress the 4wd button on the shifter, the case returns to 2wd.


Anyone wanna take a stab at this one??? [MENTION=59542]Singtoe[/MENTION]
 
Sounds like the one of your transfer case switches are hook up backwards.

Check your switches.

Manually check the switch too with a test meter and see if it locks in 4HL.
 
[MENTION=59542]Singtoe[/MENTION] the switch tested fine with my test light. The stitch in question is the CDL switch, which is normally the 4wd light switch, right?
 
The switch in question are the ones on top of the Transfer case. They Tell the ECU to engage the center diff.

The center locked indicator (4x4 Light) is the switch in the actuator assembly.
 
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