Campaign - ECM Update/Fuel Tank One Way Valve Removal: Overview
NUMBER: WVN-24DATE: October 2009 (Revised 03/23/11)
APPLICABILITY:
2007-2008MY CA PZEV Spec. Subaru Forester
SERVICE PROGRAM BULLETIN
SUBJECT:
Engine Control Module (ECM) Reprogramming & Fuel Tank One-Way Fuel Valve Removal
INTRODUCTION
Subaru of America, Inc. (SOA) has determined that vehicles affected by this Service Program have two conditions that may adversely affect the performance of the catalytic converter. To correct these conditions, described below, affected vehicles require (1) ECM reprogramming and (2) permanent removal of the fuel tank one-way fuel valve.
Condition One (1) Under certain severe driving patterns, such as high speed highway/uphill driving and/or accelerating with high engine revolutions, the efficiency of an affected vehicle's catalytic converter may begin to degrade beyond design parameters. To prevent this condition, Subaru has developed a modification to the Engine Control Module software logic that will improve management of the catalytic converter. This software change will not adversely affect the vehicle's performance.
Condition Two (2) The one-way fuel valve is located at the base of a small sub-chamber contained in the fuel tank and may not perform as intended. When the tank's fuel level drops below 1-1/2 gallons, the sub-chamber is intended to provide a fuel reserve for the fuel pump during vehicle cornering. However, the one-way valve may inadvertently act in such a way as to prevent fuel from refilling the sub-chamber; failing to provide a reserve. If this were to hap- pen, the fuel pump could momentarily draw air causing the engine to experience a sporadic misfire condition resulting in possible damage to the vehicle's catalytic converter.
If either or both conditions were to cause the catalytic converter efficiency to degrade beyond an acceptable level, the "Check Engine" light on the vehicle's instrument panel will illuminate to alert the driver that the vehicle may be releasing air pollutants that exceed Federal or California emission standards.
AFFECTED VEHICLES
2007-2008 MY Subaru Forester with CAL PZEV Spec Emission System
Affected vehicles are identified in the VIN range chart.
NOTE:
Prior to performing repairs, confirm coverage for potentially affected vehicles by using the Vehicle Coverage Inquiry function at the website.
OWNER NOTIFICATION
SOA will prepare and mail an Owner Notification Letter to owners of affected vehicles on or around January 4, 2010.
A copy of the Owner Notification Letter is included at the end of 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.
PARTS INFORMATION
SOA will automatically pre-order and ship each dealer a supply of repair parts equivalent to 20% of their affected vehicle count. Dealers will need to order any additional supply through normal parts ordering procedures.
Also, for those vehicles requiring catalytic converter replacement in association with this Service Program, Subaru has prepared the following gasket/hardware kit. Please note that the kit also includes the fuel pump housing gasket.
SPECIAL TOOLS
Vehicle ECM reprogramming Will require the following:
Subaru Diagnostic System (SDS)
^ SDS Toughbook
^ Subaru Select Monitor III (SSMIII Application Software)
^ Subaru Diagnostic Interface Box (SDI)
^ USB Data Link Cable and Reprogramming Cable.
Note:
If you require assistance with using the Subaru Diagnostic System (SDS), use the "Help" function icon, which will allow you to access the tutorial information.
Fuel Tank One-way fuel valve removal will require the following:
Fuel Line Quick Connector Tool: Part number 42099AE000
SERVICE PROCEDURE
This service procedure will involve completing the following two (2) steps:
1) Check ECM memory for diagnostic trouble codes.
2) Reprogram ECM with updated Pack file.
1) Check ECM memory for diagnostic trouble codes.
Using the appropriate Subaru Diagnostics System (SDS) components, connect to the vehicle's Diagnostic Link Connector (DLC) located in the vehicle's lower left dash panel.
Select the Select Monitor Icon from the SDS Graphical User Interface (GUI). The Main Menu will appear:
1) Select Each System Check.
2) Select Engine Control System.
3) Select Diagnostic Code(s) Display.
4) Select Memorized Diagnostic Code(s).
5) Search results will appear. Proceed as follows:
If no codes are found, proceed to the "ECM Reprogramming Instructions" section of this bulletin.
If trouble codes are found, refer to the table for the correct repair procedure. Make any necessary repairs and clear all codes prior to reprogramming the ECM.
2) ECM Reprogramming Instructions
Note:
Vehicles equipped with automatic transmission must be placed in "Park" (P) during the reprogramming process.
Confirm that your SSMIII contains the October 2009 or newer software update. Use the following Pack file to reprogram the ECM:
FUEL PUMP HOUSING & ONE-WAY FUEL VALVE REMOVAL
Note:
Removal of the fuel tank one-way fuel valve is only necessary on certain 2007 and 2008 model year vehicles. Confirm this procedure is necessary before proceeding.
WARNING:
^ Place "Caution" signs near the work area indicating "No Fire" or "No Smoking".
^ Be careful not to spill fuel on the floor.
^ Make sure there is no more than half a tank of fuel in fuel tank.
CAUTION:
Use extreme care while performing the following steps. Gasoline contained in the fuel tank is extremely flammable. Repairs should only be performed in a well ventilated area.
^ Do not use electrical devices, such as drop lights, or other items that could cause a spark.
^ Do not allow smoking or other activities in the work area that could result in ignition of fuel vapors.
^ Be sure the vehicle's battery is disconnected, as indicated in the following instructions.
1) Remove the luggage area floor mat (varies by model).
^ Remove the backside mat from the rear seat backrest.
^ Remove the clips and then detach the rear floor mats and boxes.
2) Remove fuel pump access cover.
3) Release fuel pressure:
^ Disconnect the electrical connector from fuel pump.
^ Start the engine and run it until it stalls.
^ After the engine stalls, crank it for five more seconds. Turn ignition switch to OFF.
NOTE:
Record radio pre-set stations.
4) Disconnect battery ground cable.
5) Please use caution and observe the following instructions when separating the fuel pump line connections.
Note:
The fuel line retainer clamps used on lines "A", "B", and "C", will be reused so take care not to cause damage during disassembly. (Configurations and clamp type vary by model.)
Separation of the Quick Connector on the Fuel Pump
The special tool 42O99AE000, which is set up to separate fuel hoses with quick connectors in the engine compartment, can also be used for return and delivery sub hoses. The quick connector can be unlocked by inserting the special tool around the pipe and pushing it forward as shown. Pull out and separate the connector.
6) Remove the nuts which secure the fuel pump assembly onto the fuel tank.
7) Carefully remove the fuel pump assembly from fuel tank. To ease removal, lift up on the float while removing. Do not attempt to force the pump assembly from the tank.
8) Wearing suitable fuel resistant gloves, reach into the fuel tank and remove the one-way fuel valve by pulling while twisting the valve. The valve should easily detach from the inner tank fuel reservoir. Discard the valve as it is no longer needed.
Reinstall the Fuel Pump Housing
IMPORTANT:
^ Always use a new gasket.
^ Ensure the sealing portion is free from fuel or foreign particles before installation.
1) Carefully reinstall the fuel pump housing into the fuel tank using caution while inserting the fuel level float through the fuel tank opening. It will be necessary to hold the float up to avoid interference with the inner tank fuel reservoir.
2) Tighten nuts in alphabetical sequence as shown to the specified torque.
Tightening torque: 4.4 N.m (0.45 kgf-m, 3.3 ft-lb)
3) Reattach the fuel lines. NOTE: If the fuel line retainer clamps are damaged or broken, replace with new ones.
^ When the connector is reconnected, be careful not to force, bend, or twist the pipe.
When the retainer was separated usin2 the special tool or the retainer was replaced with a new part:
Hold the connector body with your fingers, align the axis of the pipe and the connector and then push in the pipe until the retainer clicks.
^ Push and pull the connector lightly several times to ensure the pipe is fully engaged with the connector. Also, visually check if the retainer claws are engaged with the connector groove at both of the two points.
4) Reattach the fuel pump electrical connector.
5) Reconnect the battery.
6) Start vehicle and confirm there are no fuel leaks.
^ Raise fuel pressure in the high pressure fuel lines and check for leakage at each of the connectors, tubes and pipes.
7) Reinstall the fuel pump access cover and remaining components to their original condition.
8) Reprogram radio pre-set stations.
STATE EMISSION TESTING ADVISORY
After ECM reprogramming, the OBD system's readiness code monitors will set to "incomplete". Normally, the vehicle needs to be driven under a variety of conditions before the readiness code monitors will indicate "complete". (See State I/M Program Advisory Bulletin number 11-72-04, dated 8/4/04 for details.)
SERVICE PROGRAM IDENTIFICATION LABEL
Type or print the necessary information on a Service Program identification label. The completed label should be attached to the vehicle's upper radiator support.
A quantity of labels has been sent to each dealer along with their affected VIN list.
Additional labels are available through the Customer Dealer Services Department.
CALIFORNIA "VEHICLE EMISSION RECALL - PROOf Of CORRECTION" CERTIFICATE
The California Air Resources Board and the Department of Motor Vehicles Registration / Recall Program requires that all emission related Recall/Campaign or Service Program repairs be completed before a vehicle registration is renewed. Please provide owners of vehicles registered in the state of California a completed "Vehicle Emission Recall - Proof of Correction" certificate. Vehicle owners should be advised to retain this certificate because the California Department of Motor Vehicles may require they provide proof this service program repair has been completed.
CLAIM REIMBURSEMENT AND ENTRY PROCEDURES
Credit to perform this Service Program will be based on the submission of properly completed repair order information. Dealers may submit claims through Vehicle Claim Entry on Subarunet.
Note:
certain vehicles affected by the WVN-24 Service Program may also be affected by the WVU-31 ECM Reprogramming Service Program. Since the WVU-3 1 PAK file includes the updates contained in the WVN-24 PAK file, only reprogram the ECM using the WVU-31 PAK file. When WVN-24 is performed in conjunction with WVU-31, labor time will be reduced by 0.4 hours on the WVN-24 claim, to adjust for overlapping reprogramming labor.
When WVN-24 is Not Performed in Conjunction with WVU-31:
ECM Reprogramming and Fuel Tank One-way Fuel Valve Removal:
ECM Reprogramming, Fuel Tank One-Way Fuel Valve Removal and Catalytic Converter Replacement:
Note:
If catalytic converter replacement was necessary due to DTC P0420 submit claims for replacement using claim type RC.
When WVN-24 is Performed in Conjunction with WVU-31:
ECM Reprogramming and Fuel Tank One-way Fuel Valve Removal:
ECM Reprogramming, Fuel Tank One-Way Fuel Valve Removal and Catalytic Converter Replacement:
Note:
If catalytic converter replacement was necessary due to DTC P0420 submit claims for replacement using claim type RC.