Highlander LTD 2WD V6-3.0L (1MZ-FE) (2002)
Engine Control Module: All Technical Service Bulletins
Engine Controls - Pinging/Knocking Climbing Grades
T-SB-0017-08
Rev1
March 12, 2008
Engine "Pinging" or "Knocking" Noise
Service Category
Engine/Hybrid System
Section
Engine Control
Market
USA
Applicability
TSB REVISION NOTICE
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June 18, 2008 Rev1:
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Applicability has been updated to include 2001 and 2002 model years.
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Parts Information has been updated with part numbers for 2001 and 2002 model years.
Any previous printed versions of this service bulletin should be discarded.
Introduction
Some 2001 - 2003 model year Highlander 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 improved to address
this condition.
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 correction of a problem based upon a customer's specific complaint.