DTC P2404/Reprogramming Files (09-108-23)

WARNING: This page is about the Outback Limited XT, which is a different variant/trim than selected.

Publication date: 2023-07-18
Reference number: 09-108-23

DTC P2404/REPROGRAMMING FILES

TECHNICAL SERVICE BULLETIN

Reference Number(s): 09-108-23, Date of Issue: July 18, 2023

SUBARU:

2020-23MY Legacy & Outback; 2023MY Legacy & Outback

APPLICABILITY

2020-23MY Legacy & Outback 2.4L

2023MY Legacy & Outback 2.5L

INTRODUCTION

This bulletin the announces diagnostic procedures and availability of new Engine Control Module (ECM) reprogramming files to address DTC P2404 (Evap System Leak Detection Pump Sense Circuit Range/Performance) detection. In rare cases, the internal pump for the Evaporative Leak Check Module (ELCM) system can seize temporarily. The new files contain enhanced logic to prevent the ELCM pump from seizing. If P2404 is found in the fault memory, follow the procedures outlined below.

PAK FILE APPLICABILITY

Model	MY	File Name	Old Part Number	Decryption Keyword	New CID #
Legacy & Outback 2.4L	20	22765AM977.pk2	22765AM970 22765AM971 22765AM972 22765AM973 22765AM974 22765AM975 22765AM976	954775AC	LG7D900B00G
	21	22765AR245.pk2	22765AR240 22765AR241 22765AR242 22765AR243 22765AR244	004FF36F	LG7F600F00G
	22	22765AR933.pk2	22765AR930 22765AR931 22765AR932	B11BCE83	LG7G500G00G
Outback Wilderness 2.4L	22	22765AR253.pk2	22765AR250 22765AR251 22765AR252	0B2A5DBD	LG7G500H00G

These reprogramming files have been included in the April 2023 SSM software update.

PFC FILE INFORMATION

MY	Specification	Model	File Name	Old Part Number	New CID #
2023	2.4L	Legacy & Outback	22765AS462.pfc	22765AS460 22765AS461	LHBK240G00G
	2.4L	Outback Wilderness	22765AS472.pfc	22765AS470 22765AS471	LHBK240H00G
	2.5L	Legacy	22765AS49C.pfc	22765AS49A 22765AS49B	XE1W400m00G
	2.5L	Outback	22765AS50C.pfc	22765AS50A 22765AS50B	XE1W400n00G
2024	2.5L	Legacy	22765AT70B.pfc	22765AT70A	XE1W400L00G
2024	2.5L	Outback	22765AT71B.pfc	22765AT71A	XE1W400J00G

Detailed information regarding the SSM5-R reprogramming procedures can be found in TSB 14-28-21.

SERVICE PROCEDURE FLOWCHART

SERVICE PROCEDURE/INFORMATION

STEP 1: Using Subaru Select Monitor (SSM), check for diagnostic trouble codes. Confirm P2404 is stored and proceed to the next step.

NOTE: Always save SSM data and record the results of the following tests.

STEP 2: Are any of the diagnostic trouble codes listed below also stored withing the ECM?

P2419 - Evap System Switching Valve Control Circuit Low
P2420 - Evap System Switching Valve Control Circuit High
P2401 - Evap System Leak Detection Pump Control Circuit Low
P2402 - Evap System Leak Detection Pump Control Circuit High
P24BA - Evap System Leak Detection Pump Pressure Sensor Circuit Low
P24BB - Evap System Leak Detection Pump Pressure Sensor Circuit High
P24B9 - Evap System Leak Detection Pump Pressure Sensor Circuit Range/Performance

NO - Proceed to STEP 3.

YES - Perform diagnosis of the DTC(s) following the procedures outlined in the applicable Service Manual.

STEP 3: Refer to the applicable Service Manual and review: General Description > Repair Contents > Action required before & after Battery Disconnect . Additionally, record any stored seat position(s) before proceeding. Relearn any seat position memory after work is complete. If the power rear gate (PRG) height has been customized, that position must also be noted and relearned. CAREFULLY disconnect the ground terminal from the battery sensor.

STEP 4: CAREFULLY Raise the vehicle and locate the ELCM located behind the fuel tank.

STEP 5: CAREFULLY disconnect the ELCM drain tube. Inspect for signs of water or oil.

Have signs of water or oil been detected withing the ELCM drain tube?

YES - Clean and dry the drain tube using a non-alcohol base cleaner. Proceed to STEP 6.

NO - Proceed to STEP 6.

STEP 6: Connect the vehicle to a recommended power supply. See APPENDIX A for additional information regarding power supply. Using SSM, perform the Evaporative System Leak Test. Collect and save all data.

Once the evaporative system leak test is complete, check the DTCs and examine the vacuum value results. Record the value shown in the row labeled MID: $3C, TID: $C4, and Scaling ID: $FE. This value should be lower than -0.26 PSI.

Is DTC P2404 stored within the ECM?

NO - Proceed to STEP 7.

YES - Proceed to STEP 8.

STEP 7: Was the vacuum value result observed in STEP 6 found to be lower than -0.26 PSI?

YES - Proceed to STEP 11.

NO - Repeat the Evaporative System Leak Test (outlined in Step 6) then proceed to STEP 9.

STEP 8: Using SSM, perform the ELCM Pump Active Test for a period of 35 minutes or more. See APPENDIX A for additional information regarding power supply.

Once the ELCM Pump Active Test has been performed for a period of 35 minutes or more, repeat the Evaporative System Leak Test outlined in STEP 6. Check the DTCs and the vacuum value results.

Is DTC P2404 stored within the ECM?

NO - Proceed to STEP 7.

YES - Proceed to STEP 8.

STEP 9: Was the vacuum value result observed during the second Evaporative System Leak Test found to be lower than -0.26 PSI?

YES - Proceed to STEP 11.

NO - Proceed to STEP 10.

STEP 10: Replace the Evaporate Leak Check Module and repeat the Evaporative System Leak Test outlined in STEP 6. Check the DTCs and the vacuum value results.

Is DTC P2404 stored within the ECM?

NO - Proceed to STEP 11.

YES - Contact Subaru Techline with ability to provide SSM data and the testing results attained using this bulletin.

STEP 11: Reprogram the ECM following the normal FlashWrite procedure. See APPENDIX A for addition information regarding power supply.

WARRANTY/CLAIM INFORMATION

For vehicles within the Basic New Car Limited, an applicable Emission Warranty period or covered by an active Subaru Added Security Classic or Gold plan, this repair may be submitted using the following claim information:

Labor Description	Labor Operation #	Labor Time	Fail Code
ECM REPROGRAMMING & DRAIN TUBE CLEAN/EVAP TESTING	A455-223	1.0H	UPG-48
LEAK CHECK MODULE R&R AND ECM REPROGRAMMING	A455-244	1.9H	UPG-48

IMPORTANT: Always note the original Calibration Identification number (CID) the vehicle came in with on the repair order before reprogramming and, make sure to list the NEW CID for any newly-installed programming (as confirmed from the actual control module AFTER installation). The NEW CID MUST also be noted on the repair order as this information is required for entry in the claim specific data field during claim submission.

NOTE: The PAK file listings provided in this bulletin are the latest available at the time of publishing. Updates are often released thereafter without revision to the original bulletin. For this reason, it is critical to always have the latest version of Select Monitor software installed on your system. You can confirm if a later version is available by entering the CID listed in this bulletin into FlashWrite. If a newer CID is shown as available in FlashWrite, reprogram using that file.

IMPORTANT REMINDERS:

SOA strongly discourages the printing and/or local storage of service information as previously released information and electronic publications may be updated at any time.
Always check for any open recalls or campaigns anytime a vehicle is in for servicing.
Always refer to STIS for the latest service information before performing any repairs.

APPENDIX A

Subaru of America, Inc. (SOA) highly recommends connecting either the Subaru Midtronics DCA8000 Dynamic Diagnostic Charging System or the Subaru Midtronics GR8-1100 Diagnostic Battery Charger to the vehicle in the Power Supply Mode feature anytime a vehicle control module is being reprogrammed. Once the Midtronics charger is connected to the vehicle, if the battery is fully charged, it will take less than three (3) minutes to boot-up the charger, select the Power Supply Mode, and have the battery voltage stabilized and ready for reprogramming.

NOTE:

For instructions on using the Power Supply Mode, reference the applicable User Manual for the Midtronics DCA-8000 Dynamic Diagnostic Charging System and the Midtronics GR8-1100 Diagnostic Battery Charger on STIS.
Confirm all electrical loads such as lights, audio, HVAC, seat heaters, and rear defroster are all switched OFF before setting up the charger for Power Supply Mode.
Select the correct battery type (Enhanced Flooded, Flooded, Gel, AGM or AGM Spiral).
Input the CCA which matches the vehicle's battery.
NOTE: OE and replacement batteries have different CCA ratings. Always confirm the battery's CCA rating before proceeding.
If using a DCA-8000 Dynamic Diagnostic Charging System, set the power supply voltage to 13.5 Volts.
DO NOT connect the DST-i or DST-010 until the Power Supply mode function has completed its battery test mode and the Charging Voltage has dropped to and shows a steady 13.5 Volts on the display.
Once Power Supply Mode reaches a steady 13.5 Volts, connect the DST-i or DST-010 to the OBD connector and proceed with initiating the normal FlashWrite reprogramming process.
Amperage will fluctuate based upon the vehicle's demand for power.
NOTE: If the voltage rises beyond 14 Volts while programming is in process, the procedure will abort. This can indicate a need to test or charge the vehicle battery before any further attempt at programming is made.
ALWAYS set the power supply voltage to 13.5 Volts when using Power Supply Mode. NEVER turn the ignition switch on when charging at voltages 15 Volts or higher.

REMINDER: If the DCA-8000 or GR8-1100 indicates the vehicle's battery must be charged, charge the battery fully before proceeding to reprogram the vehicle while using the Power Supply Mode.

NOTE: Control module failures resulting from battery discharge during reprogramming are not a matter for warranty. Should any DTCs reset after the reprogramming update is performed, diagnose per the procedure outlined in the applicable Service Manual.

VERY IMPORTANT:

This information is applicable to the Subaru Midtronics DCA-8000 Dynamic Diagnostic Charging

System and the Subaru Midtronics GR8-1100 Diagnostic Battery Charger ONLY . It does not apply to any other brand/type of "generic" battery charger whatsoever. ONLY the DCA-8000 and the GR8-1100 and their Power Supply Mode feature have been tested and approved by SOA.