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4x4 is not engaging front wheels

Discussion in 'Technical Chat' started by surfseacher, Oct 24, 2010.

  1. Oct 24, 2010 at 11:55 AM
    #1
    surfseacher

    surfseacher [OP] Member

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    james
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    i dont know whats wrong with my 2001 tacoma 4x4. When i shift into 4x4 my transmission shifts into gear but front diff isn't engaging what;s wrong please help
     
  2. Oct 24, 2010 at 3:23 PM
    #2
    Janster

    Janster Old & Forgetful

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    What transmission do you have?

    Auto or manual?

    Do you have a gear shift 4WD or a switch?

    Are you seeing the 4X4 light on the dash at all?

    Where are you trying to engage? Are you driving? Are you not moving? Are you on a hill? Are your wheels straight?
     
  3. Oct 24, 2010 at 4:27 PM
    #3
    surfseacher

    surfseacher [OP] Member

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    auto tran no light on dash and front axle is turning
     
  4. Oct 24, 2010 at 8:11 PM
    #4
    David K

    David K Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Cibie Halogen. Bilstein 5100s Ride Rite Air Bags
    ADD issue?

    The ADD (Automatic Disconnecting Differential) is how our Tacomas can have 'shift on the fly' 4WD hi-range and 'free wheeling hubs' (auto locking hubs)... but instead of auto locking right at each hub, which requires driving backwards to unlock... Toyota has a device on one of the axles next to the front differential that connects and disconnects with an electric motor when you go into or out of H4. Only the two front axles turn (with the tires) but not the differential gears or front drive shaft... saving wear and improving mileage.

    There have been some problems with the ADD that require fixing or learning how to engage it manually, so you can 4 wheel. Search ADD fixes here.
     
  5. Oct 25, 2010 at 4:08 AM
    #5
    Janster

    Janster Old & Forgetful

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    Is the front axle DRIVING or just turning?

    Do you have a Shift lever or a push button?
     
  6. Oct 27, 2010 at 6:40 PM
    #6
    surfseacher

    surfseacher [OP] Member

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    yes the front axle is spinning and i have a shift lever

    and i'm not completly sure yet but my add may have been bypassed i was following the vac hoses and they ran up near the battery and were capped off

    so what do i do now did someone not get it engaged or how do i manually engauge
     
  7. Oct 29, 2010 at 6:30 AM
    #7
    tacosuprem

    tacosuprem Well-Known Member

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    that may be the breather
     
  8. Oct 29, 2010 at 10:28 AM
    #8
    David K

    David K Well-Known Member

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    Yup,
    The two rubber tubes that are attched near the battery with silver caps on top are the breathers for the front differential and the ADD. This is something many of us have down on the rear differential so it doesn't get contaminated... see link in my sig. below!
     
  9. Oct 29, 2010 at 3:44 PM
    #9
    surfseacher

    surfseacher [OP] Member

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    ok yeah thx i did check out your links

    so does this mean its been discoonected but not engauged?
     
  10. Feb 22, 2011 at 8:59 AM
    #10
    David K

    David K Well-Known Member

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    Front differential and ADD breathers:

    [​IMG]

    [​IMG]
     
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