Impreza WRX STI F4-2.5L Turbo (2008)
Technical Service Bulletin # WVE-15
Date: 080801
Campaign - ECM Update For High RPM Lean Condition
NUMBER: WVE-15
DATE: Aug. 2008
APPLICABILITY:
2008MY Impreza WRX STI
SUBJECT:
Engine Control Module (ECM) Reprogramming
INTRODUCTION
Subaru of America, Inc. (SOA) has determined that vehicles affected by this Service Program require ECM reprogramming. Under certain harsh driving
patterns, specifically when repeatedly or continuously operating the engine above the "red-line" (RPM above 6,700), abnormal combustion could occur
resulting in serious internal engine damage in the form of broken piston ring lands. This abnormal combustion condition is the result of an "over lean"
fuel mixture caused by a combination of fuel cut activation and high turbo boost. To prevent this condition from occurring, Subaru has developed a
modification to the Engine Control Module software logic that will improve combustion management above "red-line" engine speed. This revised logic
will not adversely affect peak vehicle performance.
AFFECTED VEHICLES
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2008 MY Subaru Impreza WRX STI
Affected vehicles are identified in the VIN range chart above.
NOTE:
Some vehicles affected by this Service Program have already been updated by Subaru. Prior to performing repairs, confirm coverage for potentially
affected vehicles by using the Vehicle Coverage Inquiry in the Dealer Communication System (DCS).
OWNER NOTIFICATION
SOA will prepare and mail an Owner Notification Letter to owners of affected vehicles on or around August 15, 2008.
A copy of the Owner Notification Letter is shown in this bulletin.
DEALER PROGRAM RESPONSIBILITY
Dealers are to promptly service all vehicles subject to this service program at no charge to the vehicle owner regardless of mileage, age of the vehicle, or
ownership.
For affected vehicles sold after the date on the dealer's computer list, dealers are to contact those owners and provide them with a copy of the owner
notification letter. They should also arrange to make the required correction according to the instructions in the service procedure section of this bulletin.
Dealers are also to promptly perform the applicable service procedures defined in this bulletin to correct all affected vehicles in their inventory (new,
used, demo). Additionally, whenever a vehicle subject to this service program is taken into dealer new or used inventory, or is in the dealership for
service, necessary steps should be taken to ensure the service program correction has been made before selling or releasing the vehicle.
SPECIAL TOOLS
SERVICE PROCEDURE
