Drivetrain - Transfer Case ECM Replacement Information

T-SB-0090-08

June 9, 2008

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

Service Category
Drivetrain

Section
Transfer/4wd/Awd

Market
USA





Applicability

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.





Warranty Information

APPLICABLE WARRANTY

^ This repair is covered under the Toyota Powertrain Warranty. This warranty is in effect for 60 months or 60,000 miles, whichever occurs first, from the vehicle's in-service date.

^ Warranty application is limited to correction of a problem based upon a customer's specific complaint.





Production Change Information

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





Parts Information





Required Tools & Equipment

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 Technical Information System (TIS):

2007 or 2008 model year Tundra Repair Manual Drivetrain - Transfer/4wd/Awd - "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 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"