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

DTC P2404/REPROGRAMMING FILES

TECHNICAL SERVICE BULLETIN

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
		Outback Wilderness	22765AS472.pfc	22765AS470 22765AS471	LHBK240H00G
	2.5L	Legacy	22765AS49C.pfc	22765AS49A 22765AS49B	XE1W400m00G
		Outback	22765AS50C.pfc	22765AS50A 22765AS50B	XE1W400n00G
2024	2.5L	Legacy	22765AT70B.pfc	22765AT70A	XE1W400L00G
		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.

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