Canada - Drivetrain Controls - 4WD ECU Service Precautions

Bulletin
2026

Issue Date
June 22, 2004

Market
Canada

Title:
4WD ECU SERVICE PRECAUTIONS

Model
'03 - '04 4Runner (V6 Engine)

When servicing or disconnecting the 4WD ECU, be sure to disconnect all power by removing the 20A 4WD fuse or the negative battery terminal. Failure to disconnect power for the 4WD ECU before performing Repair Manual diagnostic procedures may cause the transfer case actuator to activate and damage the transfer case actuator.

APPLICABLE VEHICLES:
- 2003 - 2004 model year 4Runner vehicles equipped with V6 engine (multi-mode 4WD) only.

REPAIR PROCEDURE:

CAUTION:
Irreparable damage to the transfer case actuator may result when the proper precautions and repair procedures are NOT followed. Damage to the actuator caused by improper repair procedures is NOT a warrantable repair.

Refer to ETAS for proper repair precautions.
Use the applicable model year 4Runner Repair Manual:
Section: Introduction;
Subsection: Repair Instruction; Precaution







WARRANTY INFORMATION:

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.