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.


@Singtoe

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

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

The button activates the front diff and the CLD.

Get ahold of @Singtoe . He might be able to help ya out a little more with the wiring, seeing as how he mated one to the Sequoia trans.

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

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...

I was thinking this, but wanted to make sure. Thank you Rob!

You'll shoot your eye out...

Wait...I don't have anything worthwhile for you on this topic other than I see you figured out how to tag people in a thread.

@Appntr thanks for your useful post... Go play in traffic! hahaha

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?

Sorry, I couldn't get past "I have a 99 Tacoma with an 02 Tundra V8".

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.

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.

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 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.

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.