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4wd won't engage, troubleshooting

Discussion in 'Technical Chat' started by rawtaco, Dec 5, 2010.

  1. Dec 5, 2010 at 9:04 PM
    #1
    rawtaco

    rawtaco [OP] ADV Rider

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    Damien
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    I have a 03 Tacoma V6 AT, push button 4WD. The 4wd is not engaging, and the light is not going on. Could you help me troubleshoot this problem? I’ve got the truck on jack stands now, I’m ready to get this project going so that I can get up to the mountains over the winter break.

    What I have done so far… when I push the 4wd button, I can hear the actuator on the differential clicking. When the front wheels are off the ground, and the truck in 2wd, I can spin the front drive shaft by hand. When in 4wd, I can not spin the font drive shaft by hand. But in 4wd, when I spin the front tires, the front drive shaft does not spin.

    So, is there an actuator located on the front axle, passenger side? I see something that looks like that. Any suggestions how to trouble shoot that, or what to do next?

    Thank you!
     
  2. Dec 5, 2010 at 9:40 PM
    #2
    David K

    David K Well-Known Member

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    I am not a mechanic, so I can't help... but you may find something if you search under ADD (Automatic Disconnecting Differential) which is how we have 'auto locking hubs' on Tacomas for shift on the fly ability, but don't need to drive backwards to unlock them.

    The ADD uses a fork on one of the front axles next to the differential. I have heard of that fork not working electrically... but until it is repaired you can manually engage it... you can go in and out of 4WD, but your front drive will not be free wheeling... no biggie, locking hubs weren't on WWII Jeeps afterall.

    Good luck!
     
  3. Dec 6, 2010 at 5:00 AM
    #3
    Janster

    Janster Old & Forgetful

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    Make sure your vacuum lines are hooked up and/or don't have any vacuum leaks.
     
  4. Dec 6, 2010 at 5:18 AM
    #4
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
    That means it is working (if you had the truck in park). Are you referring to the green 4x4 light in the dash that isn't lighting up? That could just be a simple switch on the TC.
     
  5. Dec 6, 2010 at 5:21 AM
    #5
    Graham

    Graham Pay it Forward

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  6. Dec 6, 2010 at 8:26 AM
    #6
    rawtaco

    rawtaco [OP] ADV Rider

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    Bilstein 5100s all around... nice mod
    Thanks, I'll check that now...
     
  7. Dec 6, 2010 at 8:27 AM
    #7
    rawtaco

    rawtaco [OP] ADV Rider

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    No, the 4wd is absolutely not working. Power is not delivered to the front wheels.
     
  8. Dec 6, 2010 at 8:30 AM
    #8
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
    What you described indicates the front axle is connecting if you spin one wheel and the other wheel spins in the opposite direction.
     
  9. Dec 6, 2010 at 9:03 AM
    #9
    rawtaco

    rawtaco [OP] ADV Rider

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    When I spin one wheel, the other wheel is not affected.
     
  10. Dec 6, 2010 at 9:09 AM
    #10
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Ok, that means the axle disconnect is non-functional. As Jan posted, it is an electrical actuator that opens a vacuum up to slide the fork.

    Here are some pages out of the FSM to help you diagnose the problem further.

    http://www.ncttora.com/fsm/2003/Repair_Manual/03tacoma/sa/acsy14wd/insp.pdf

    In the below page, the ADD relay is actually behind the glove box. That pic is confusing.
    http://www.ncttora.com/fsm/2003/Repair_Manual/03tacoma/sa/acsy14wd/loca.pdf

    http://www.ncttora.com/fsm/2003/Repair_Manual/03tacoma/sa/fdc4wd/comp.pdf
     
  11. Dec 6, 2010 at 9:14 AM
    #11
    rawtaco

    rawtaco [OP] ADV Rider

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    PERFECT. Thanks for the help. I'll report back.
     
  12. Dec 12, 2010 at 8:01 PM
    #12
    rawtaco

    rawtaco [OP] ADV Rider

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    Bilstein 5100s all around... nice mod
    I used the links to confirm that the ADD disconnect is bad. The resistance measured at the plug was out of spec. Great link - thanks. I've ordered a new part from trdparts4u.

    Final report to come when it's installed.
     
  13. Dec 20, 2010 at 1:14 PM
    #13
    rawtaco

    rawtaco [OP] ADV Rider

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    Bilstein 5100s all around... nice mod
    Well crap, I just installed a new actuator and the 4WD is not working still. Too bad. I did the trouble shooting according to the manual, and the resistance measured indicated that it was shot. Now I guess I'll do the same for the new actuator, and check the relays. After it stops pouring rain. Which should be in four days.
     
  14. Dec 20, 2010 at 1:18 PM
    #14
    Max-4_Yota

    Max-4_Yota The Welfare Cadilac

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  15. Nov 16, 2013 at 3:49 PM
    #15
    imcshane85

    imcshane85 Member

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    Same thing has happened to me, except I have an 05 Tacoma TRD TRD, V6, 6 Speed. When I turn the switch, the light does not come on. I use 4WD quite often, and it's been working up until today, although the last couple times I used it it it didn't go out or come in to 4wd as easily as it should. It could be the actuator has gone bad, and it seems they are known to go bad, but before I change it out I wanted to ask if there's often easier solutions, like is this truck known to get leaks in the vacuum lines or something?

    I don't want the same thing to happen to me, order a new actuator and replace it only to find it doesn't work. What's my best course of action?

    Thanks
     
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