1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

2015 1794 actuator/transfer case issue

Discussion in '2.5 Gen Tundras (2014-2021)' started by ifithaswheels, Aug 2, 2022.

  1. Aug 2, 2022 at 4:51 AM
    #1
    ifithaswheels

    ifithaswheels [OP] New Member

    Joined:
    May 14, 2022
    Member:
    #78401
    Messages:
    7
    Gender:
    Male
    First Name:
    Karl
    Vehicle:
    White TRD Supercharged
    Arb bar, arb air lockers, lift kit, wheels
    I have an issue with my 2015 1794 5.7 crewmax. When I try and switch to 4x4 the light flashes on the dash but won’t go into 4x4
    I can hear a noise like it’s trying but still won’t go in
    The code when scanned was (P279E 4wd range signal circuit range performance )???

    is the issue the actuator? Does anyone know?
    can you undo the actuator and manually switch it to 4wd? To test the transfer case switch? I’m about to swap out the transfer case oil to straight 75W as I think it has 75w-85 in it?
    Any advice would be greatly appreciated
     
  2. Aug 2, 2022 at 8:00 AM
    #2
    agrestic1

    agrestic1 New Member

    Joined:
    Apr 7, 2018
    Member:
    #14263
    Messages:
    64
    Gender:
    Male
    Vehicle:
    2016 CrewMax
    AMP Research PowerStep, AMP BedStep Bumper Step, BedRug Carpet Bed Mat, Bazooka Powered Subwoofer Tube
    So found this per code P279E: Wire harness or connector
    4 wheel drive control ECU
    Transfer Position Switch
    I'll see if I can upload wire harness and test procedure with Multimeter..
     
    BossHog likes this.
  3. Aug 2, 2022 at 3:28 PM
    #3
    ifithaswheels

    ifithaswheels [OP] New Member

    Joined:
    May 14, 2022
    Member:
    #78401
    Messages:
    7
    Gender:
    Male
    First Name:
    Karl
    Vehicle:
    White TRD Supercharged
    Arb bar, arb air lockers, lift kit, wheels
    Thanks that would be great
    Some say just replace the actuator
    I’d like to know if it’s unbolted but connected to the wires if you turn the switch will it function and go back to original position?
    Eg if removed while in 2wd position

    and I guess while removed is there a test procedure for the transfer case shaft?? Thanks
     
  4. Aug 3, 2022 at 5:48 AM
    #4
    agrestic1

    agrestic1 New Member

    Joined:
    Apr 7, 2018
    Member:
    #14263
    Messages:
    64
    Gender:
    Male
    Vehicle:
    2016 CrewMax
    AMP Research PowerStep, AMP BedStep Bumper Step, BedRug Carpet Bed Mat, Bazooka Powered Subwoofer Tube
    I also have that question..
    Been trying to upload the troubleshooting testing procedure and it won't upload. I'll keep trying..
     
  5. Aug 3, 2022 at 4:04 PM
    #5
    agrestic1

    agrestic1 New Member

    Joined:
    Apr 7, 2018
    Member:
    #14263
    Messages:
    64
    Gender:
    Male
    Vehicle:
    2016 CrewMax
    AMP Research PowerStep, AMP BedStep Bumper Step, BedRug Carpet Bed Mat, Bazooka Powered Subwoofer Tube
    Not sure if this helps but see attached..

    20220803_190013.jpg
    20220803_190028.jpg
    20220803_190040.jpg
    20220803_190048.jpg
    20220803_190058.jpg
     
  6. Aug 3, 2022 at 8:29 PM
    #6
    ifithaswheels

    ifithaswheels [OP] New Member

    Joined:
    May 14, 2022
    Member:
    #78401
    Messages:
    7
    Gender:
    Male
    First Name:
    Karl
    Vehicle:
    White TRD Supercharged
    Arb bar, arb air lockers, lift kit, wheels
    Thanks so much I believe this will come in really handy
    I think I had a breakthrough today
    I changed my transfer case oil to straight 75w
    It was a task finding this here in Australia but I got it
    Whilst I was under the truck I put the ignition on and selected four-wheel-drive
    I tried to turn the shaft that runs between the transfer case and the front and it was locked to my way of thinking this indicates that the transfer case actuator is working and the problem is the front differential actuator
    I need to get it up into the air on a to post hoist so I can do the same thing and then try and spin the wheels I think I’m getting closer to solving the issue
    Reading all of the forums I’m actually a little bit shocked that such a modern Toyota has quite a few issues with regards to 4x4 actuators and the design at hand
    My old car which I still have is a 1999 Lexus LX 470 it is done a zillion kilometres and still does not have an issue
     
  7. Aug 4, 2022 at 5:05 AM
    #7
    agrestic1

    agrestic1 New Member

    Joined:
    Apr 7, 2018
    Member:
    #14263
    Messages:
    64
    Gender:
    Male
    Vehicle:
    2016 CrewMax
    AMP Research PowerStep, AMP BedStep Bumper Step, BedRug Carpet Bed Mat, Bazooka Powered Subwoofer Tube
    Post what you find, Thanks
     

Products Discussed in

To Top