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1st Gen 4WD Issues Diagnosis/Prevention Guide

Discussion in '1st Gen Tundras (2000-2006)' started by FiatRunner, Oct 8, 2024.

Page 2 of 2
  1. Jun 8, 2025 at 5:44 PM
    #31
    Voss

    #31
    Voss Not a new member

    Joined:
    Feb 28, 2019
    Member:
    #26833
    Messages:
    1,648
    Gender:
    Male
    Vehicle:
    2003 AC TRD 4x4
    The 2nd video under “attempt to fix” perfectly describes my issues and my vacuum hose was probably what caused it as well.
    Thank you!!
     
    Voss, Jun 8, 2025
    #31
    FiatRunner[OP] likes this.
  2. Jul 3, 2025 at 3:09 PM
    #32
    Firemedicman

    #32
    Firemedicman New Member

    Joined:
    Jun 2, 2019
    Member:
    #31371
    Messages:
    5
    Vehicle:
    2004 Tundra DC TRD Offroad
    Final Update:

    I finally fixed my problem. It was the transfer switch on the transfer case. The switch telling the 4wd module that the transfer case is engaged would quit working when it would get hot, but start working when it was cool. This kept the 4wd module from sending the signal to the front actuator to engage the front axle. I used the Dorman switch available at Autozone part number JA449. I have been using my 4wd regularly since I replaced the switch without issue. Thanks.
     
    Firemedicman, Jul 3, 2025
    #32
    BroHon, Jack McCarthy, FiatRunner[OP] and 2 others like this.
  3. Jul 4, 2025 at 7:43 PM
    #33
    FiatRunner

    #33
    FiatRunner [OP] 2003 rich

    Joined:
    Nov 25, 2022
    Member:
    #87321
    Messages:
    1,179
    Gender:
    Male
    First Name:
    Jack
    Chicago Suburbs/Milwaukee
    Vehicle:
    2000 AC Limited TRD + 4WD + Thunder Gray
    See Refresh Thread (link in signature)
    Really glad you got it figured out! I might have to change some of the diagnosis guide to mention that we’re seeing position switch failures more often.
     
    FiatRunner, Jul 4, 2025
    #33
    BroHon, The Black Mamba and shifty` like this.
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