Tundra 4WD V8-5.7L (3UR-FE) (2007)
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B.
Is the 4WD computer part number 89533-0C031?
^
YES - the 4WD computer has already been replaced. This TSB does NOT apply. Replacement of the 4WD ECM is NOT required.
^
NO - Go to step 3.
3.
Replace the 4WD ECM.
Refer to TIS:
2007 model year Tundra Repair Manual Drivetrain - Transfer/4wd/Awd - "JF1A Transfer: 4WD Control ECU: Removal and Installation"
2008 model year Tundra Repair Manual Drivetrain - Transfer/4wd/Awd - "JF1A Transfer: 4WD Control ECU: Removal and Installation"
