Canada - Transfer Case - 4WD ECM Replacement

Bulletin
TSB3021

Issue Date
August 15, 2008

Market
Canada

Title
4WD ECM Replacement with Transfer Case/Transfer Case Actuator Assembly Replacement

Component
Driveline

Models
'07-'08 Tundra

INTRODUCTION:

If the transfer case assembly or transfer case actuator assembly is replaced on some 2007 and 2008 model year Tundra vehicles, the four wheel drive (4WD) computer (ECM) may need to be replaced at the same time due to transfer case assembly and 4WD ECM logic changes. Refer to the procedure below to confirm if replacement of the 4WD ECM will be required at the same time as the transfer case assembly or transfer case actuator assembly replacement.






APPLICABLE VEHICLES:






WARRANTY INFORMATION:

PRODUCTION CHANGE INFORMATION:







This TSB applies to vehicles produced BEFORE the Production Change Effective VINs shown.






PARTS INFORMATION:






REQUIRED SSTS:

NOTE:
Additional SSTs may be ordered by calling SPX/OTC at 1-800-933-8335.

REPAIR PROCEDURE:

1. When replacing the transfer case assembly or transfer case actuator assembly on a 2007 or 2008 model year Tundra, confirm if the vehicle is produced prior to the Production Change Effective VINs in this TSB.


Is the vehicle produced AFTER the Production Change Effective VIN?
- YES - This TSB does NOT apply - 4WD ECM replacement is NOT required.
- NO - Go to step 2.

2. Confirm the 4WD ECM part number installed in the vehicle.
A. To access the 4WD ECM and confirm the ECM part number, refer to the Repair Manual within E-TAS / TIS library:
- Division: Toyota
- Model: Tundra
- Year: 2007 / 2008
- Service Category: Drivetrain
- Section: Transfer/4wd/Awd
- Keyword: JF1A Transfer: 4WD Control ECU: Removal

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 the Repair Manual within E-TAS / TIS library:
- Division: Toyota
- Model: Tundra
- Year: 2007 / 2008
- Service Category: Drivetrain
- Section: Transfer/4wd/Awd
- Keyword: JF1A Transfer: 4WD Control ECU: Removal and Installation

NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.