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Over-ride / manually operate 4wd actuator?

Discussion in '3rd Gen. Tacomas (2016+)' started by Rujack, Oct 27, 2018.

  1. Oct 27, 2018 at 7:20 PM
    #1
    Rujack

    Rujack [OP] Stop Global Whining

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    How can this be done on the trail in case of a failure of the actuator?
     
  2. Oct 27, 2018 at 7:26 PM
    #2
    Bishop84

    Bishop84 Well-Known Member

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    Simply, you can't, the actuator holds the selector in place, you would need a locking device to hold it. A vice grip might work in a pinch, but if the limit switch for 4x4 doesn't work it won't actuate the front diff.

    The front diff has a sliding sleeve that also can't be overridden because it needs to be held in place at a specific spot.

    If you get super serious you can put a FJ cruiser transfer case in with actual levers, and there's ways to delete the ADD in the front.

    The front differential disconnect (ADD) is the weak point on these trucks. The real secret is to carry a spare ADD actuator.

    download.jpg
     
    RustyTacos likes this.
  3. Oct 27, 2018 at 7:28 PM
    #3
    Rujack

    Rujack [OP] Stop Global Whining

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    Well, that’s a bummer.

    Contemplating the fj case, but it’ll be way down the line.
     
  4. Oct 27, 2018 at 7:34 PM
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    SC4333

    SC4333 Well-Known Member

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    @Bishop84 do you know how much a ADD runs? New or used?
     
  5. Oct 27, 2018 at 7:39 PM
    #5
    Bishop84

    Bishop84 Well-Known Member

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    I've had customers supply them from online for around 200$, I think Toyota's price is 600$ haha.
     
  6. Oct 27, 2018 at 7:42 PM
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    SC4333

    SC4333 Well-Known Member

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    Ouch! $600 is nuts
     
  7. Oct 27, 2018 at 10:57 PM
    #7
    Flash1034

    Flash1034 Well-Known Member

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    Might you have a Toyota part number?
     
  8. Oct 28, 2018 at 5:54 AM
    #8
    BigWhiteTRD

    BigWhiteTRD Official thread killer (only crickets remain)

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    You can electrically override both actuators. Pull actuator connector on each actuator and apply 6v-12v to the appropriate pins. Only works if motor is still connected electrically and not jammed. This will 'override' feedback position switch failures.
     
    libagui and tonered like this.
  9. Oct 28, 2018 at 6:08 AM
    #9
    Rujack

    Rujack [OP] Stop Global Whining

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    Awesome thanks. Do you have a diagram showing which pins? Or what color the appropriate wires are? No worries if not.

    If they’re jammed, any steps to try to free them up?
     
  10. Oct 28, 2018 at 11:29 AM
    #10
    BigWhiteTRD

    BigWhiteTRD Official thread killer (only crickets remain)

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    I have more written up some more previously (that I can see if i can find tonight or tomorrow.) I know on front ADD its pin 1 and 2 on the ADD connector, heavier gauge red and blue wires.
    See 2 wheel lo schematic in my thread in sig.

    From playing in general to free up an issue,( with no actual failure modes), on the front ADD.. I jack 1 front wheel and spin free tire while trying to get ADD to engage.

    If this overall is a significant fear, it would well be worth it for you to make a breakout box. Spend about $20 on connectors, some wire, and a little box with a few switches (some LEDs if you want to get fancy, but probably not worth it). Let you manually force position of either actuator (if the motors are still viable) regardless of the ECU being pissed.

    If you want some help with this idea, I can give you some info and we can try to put something elegant. (If you are really interested in building one). I have thought about making one of these, as I found I could inadvertently put the front ADD into invalid positions while doing 2wheel low failure mode testing, 4wd mode change were then locked out.

    To get 4wd back, I had to manually run the motor by putting a few volts on it to get back into a valid actuator position. I just did it with a few pieces of wire and a flashlight 6v battery pack, but a premade harness to do it would be sweet...

    This making sense? Sorry, kinda jibberishy.
     
    stun gun likes this.
  11. Oct 28, 2018 at 3:46 PM
    #11
    BigWhiteTRD

    BigWhiteTRD Official thread killer (only crickets remain)

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    ADD
    upload_2018-10-28_18-23-15.jpg
    upload_2018-10-28_18-27-10.jpg



    Transfer Case
    upload_2018-10-28_18-24-53.jpgupload_2018-10-28_18-25-49.jpg
    upload_2018-10-28_18-27-56.jpg

    For toyota parts here is approximately what I come up with (cheaper may be available overseas, etc.)
    ADD Side
    90980-11858 ~$12.18
    2 * 82998-12440 ~2*$6.57

    Transfer Side
    90980-11151 ~$9.85
    2 * 82998-12440 ~2*$6.57

    ~$48.31 total for toyota brand connectors or pins


    (plus some long wiring, a few dpdt switches, and a power source, or 12v battery connection.)
     

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