Sienna V6-3.0L (1MZ-FE) (2003)
Engine Control Module: Customer Interest
Engine Controls - Engine Knocking Or Pinging Noises
T-SB-0125-08
Rev1
July 2, 2008
Engine "Pinging" or "Knocking" Noise
Service Category
Engine/Hybrid System
Section
Engine Control
Market
USA
Applicability
TSB REVISION NOTICE
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November 17, 2008 Rev1:
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Applicability has been updated to include 2003 model year.
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Warranty and Parts Information sections have been updated with 2003 model year information.
Any previous printed versions of this service bulletin should be discarded.
Introduction
Some 2001 - 2003 model year Sienna vehicles equipped with a 1MZ-FE engine may exhibit an intermittent "pinging" or "knocking" noise when
accelerating slowly up a grade. The Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic has been modified to improve
this condition. Use the following procedure to address customer concerns.
Warranty Information