Tundra 4WD V8-4.6L (1UR-FE) (2010)
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Engine Control Module: Customer Interest
Engine Controls - ECM Update For Shift Performance
T-SB-0285-10
October 12, 2010
ECM Calibration: Enhancement to Shifting Performance
Service Category
Drivetrain
Section
Automatic Transmission/Transaxle
Market
USA
Applicability
Introduction
Some vehicles may exhibit the following shifting conditions:
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Harsh shift on acceleration below 20 mph during the 2-1 downshift.
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Excessive lock-up operation at freeway speeds about 50 - 60 mph, sometimes referred to as "busy shifting".
The Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM) calibration has been revised. Use the following repair procedure to
address these conditions.
Warranty Information
APPLICABLE WARRANTY
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This repair is covered under the Toyota Federal Emission Warranty. This warranty is in effect for 96 months or 80,000 miles, whichever occurs first,
from the vehicle's in-service date.
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Warranty application is limited to occurrence of the specified condition described in this bulletin.
