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How To Trouble Shoot 4x4 Actuator

Discussion in '2nd Gen. Tacomas (2005-2015)' started by blackhawke88, Feb 15, 2013.

  1. Aug 4, 2022 at 4:08 PM
    #861
    Mezvyk4200

    Mezvyk4200 Member

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    anyone ever tried accessing this spring loaded wait mechanism? I am thinking this could be my culprit… maybe save myself a few hundred bucks
     
  2. Aug 4, 2022 at 7:32 PM
    #862
    6 gearT444E

    6 gearT444E Certified Electron Pusher

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    that’s never been a problem. It’s part of the worm wheel.
     
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  3. Aug 4, 2022 at 8:03 PM
    #863
    Dm93

    Dm93 Test Don't Guess

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    You can access it but I don't know how repairable it would be.

    Here's a schematic drawing and picture of the contacts of the ADD Actuator from my thread on the 4wd system.

    upload_2022-8-4_22-1-59.jpg

    upload_2022-8-4_22-2-55.jpg
     
  4. Aug 5, 2022 at 5:38 AM
    #864
    SR-71A

    SR-71A Define "Well-Known Member"

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    Unfortunately I dont have any good pictures of the spring mechanism. But its just a really big clock spring under the gear. As @6 gearT444E said Ive never read about that being an issue and doubt it ever would be.

    It sounds to me like you have water in the front diff. IIRC some oil drains out when you pull the ADD, but not a ton. I would definitely recommend you get that drain plug out (have a new plug on hand, or upgrade to the Lexus drain plug part # 90341-24016) and do a full flush of the old oil. Hopefully the oil did its job and protected the internals for the most part. The fact that you can move the sleeve by hand is a good thing.
     
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  5. Aug 5, 2022 at 2:10 PM
    #865
    Mezvyk4200

    Mezvyk4200 Member

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    So the drain plug came out with cold chisel, took maybe 5 minutes (between the fluid loss from yesterday and today it added up to pretty much 1.6 quarts). Refilled the diff but the ADD is functioning just as before. When I turn the switch the transfer case locks up, I hear the ECU click but the light keeps flashing green and the front propeller shaft is engaged.
    I am in the process of getting the broken “new” ADD either refunded or exchanged so have to wait for that to get here now I guess.
    As for the water in the diff, I dont know if thats the case cause I didnt see much if any water when I drained it. I was on a bit of a slope when I took the ADD out yesterday so that might explain why more than usual amount came out.
    Can the timing between the actuators be an issue? I swear these trucks have a mind of their own sometimes.
     
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  6. Aug 5, 2022 at 2:29 PM
    #866
    Dm93

    Dm93 Test Don't Guess

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    Shouldn't be, the transfer case actuator can be timed incorrectly in relation to the shift fork in the transfer case and I'm not sure if the ADD can be mis-timed internally if it's ever been taken apart or not.

    I have all the shift sequences and limit switch voltages in my thread below but since you said it worked a few times and quit and I'd bet it's just bad.

    https://www.tacomaworld.com/threads/4wd-system-operation-help-thread.742420/
     
  7. Aug 5, 2022 at 2:41 PM
    #867
    Mezvyk4200

    Mezvyk4200 Member

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    Thanks! Yes I have seen that write up by you and been reading this thread religiously before I took on any of this. This is my first Taco and more of a hunting vehicle than off roading so I am really hoping to get it going reliably for October as we drew again, back to back years, for a goat hunt in the Rockies and the terrain was pretty terrible last year.
     
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  8. Aug 6, 2022 at 10:30 AM
    #868
    TRDMopar

    TRDMopar Well-Known Member

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    I did this with much frustration on that one bolt. Did not fix so now I'm going to replace the sensors on the transfer case. Lol, fingers crossed. This thread was awesome tho!
     
  9. Aug 10, 2022 at 2:21 PM
    #869
    Mezvyk4200

    Mezvyk4200 Member

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    Well I am happy to report that after buying the ADD from the dealership it now engages the 4wd like butter. Gave the front diff some extra love too and splurged on some royal purple.

    now my battle with ZN automotive to return their broken and non functioning ADD.

    off to doing some more maintenance. Gotta get these leaf springs to stop squeaking now and install the ECGS bushing. thanks everyone for their help here, really made this fix easy.
     
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  10. Aug 10, 2022 at 2:31 PM
    #870
    Shakeber

    Shakeber Well-Known Member

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    Thanks for this info. Hope to not need it someday.
     
  11. Sep 12, 2022 at 5:00 PM
    #871
    babylon5

    babylon5 Well-Known Member

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    Luckily no problem so far but was wondering if any knows the vacuum tubing internal diameter that connects to the transfer case actuator.

    I hear it can become brittle /crack and let water in and is one of the prime sources of failure. Want to add this to my check list when i am under the truck greasing the U-joints and might even just replace it with some thin wall high temp silicone hose to fix it once and for all.. Looking at the photo's of the front ADD some of them look like water got in there as well?? Anyone notice if the same issue with the vent tube hose happens here like the rear actuator?
     

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