Canada - Engine Control - Engine Pinging Or Knocking Noise

Bulletin
TSB2986R

Issue Date
March 31, 2008

Market
Canada

Title
ENGINE "PINGING" OR "KNOCKING" NOISE

Component
ENGINE MECHANICAL

Models
'01-'03 Highlander

TSB REVISION NOTICE:
- July 10, 2008: 2001-2002 model years have been added to Applicable Vehicles. Parts Information has been updated. Previous versions of this TSB 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] logic has been improved to address this condition.






APPLICABLE VEHICLES:






PARTS INFORMATION:






WARRANTY INFORMATION:

INSPECTION PROCEDURE:

1. Drive the vehicle slowly up a slight grade using light throttle input.
2. If engine "pinging" or "knocking" can be heard between 1400-1800 rpm, follow the procedure below to resolve the customer's concern.

REPAIR PROCEDURE:







1. Remove and replace the ECM (PCM).
2. Start the engine and warm it up to normal operating temperature before test driving.
3. Test drive the vehicle to confirm normal operation. The repair is complete

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.