DTC P2404/Reprogramming Files (09-113-23)

DTC P2404/REPROGRAMMING FILES

TECHNICAL SERVICE BULLETIN

APPLICABILITY

2017-22MY Forester

INTRODUCTION

This bulletin 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

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

MY	File name	Specification	Old Part Number	Decryption Keyword	New CID #
17	22765AH854.pak	2.5L NA, 6MT	22765AH850 22765AH851 22765AH852 22765AH853	67E0C04A	EB4L200W
	22765AH864.pak	2.5L NA, CVT	22765AH860 22765AH861 22765AH862 22765AH863	D45ED35A	EB4J350R
18	22765AL383.pak	2.5L NA, 6MT	22765AL380 22765AL381 22765AL382	1B3F1BAD	EB4P040W
	22765AL393.pak	2.5L NA, CVT	22765AL390 22765AL391 22765AL392	665EE069	EB4S300R
19	22765AL827.pak	2.5L NA, CVT	22765AL820 22765AL821 22765AL822 22765AL823 22765AL824 22765AL825 22765AL826	A44B186E	XE1FB00A
20	22765AN466.pak	2.5L NA, CVT	22765AN460 22765AN461 22765AN462 22765AN463 22765AN464 22765AN465	585CB1E4	XE1M700a00G
21	22765AR675.pak	2.5L NA, CVT	22765AR670 22765AR671 22765AR672 22765AR673 22765AR675	67CEEA2A	XE1P800a00G
22	22765AR604.pak	2.5L NA, CVT	22765AR600 22765AR601 22765AR602 22765AR603	E1A8EC6C	XE1R600k00G
22	22765AR554.pak	2.5L NA, CVT	22765AR550 22765AR551 22765AR552 22765AR553	B4E98F7C	XE1R600a00G
22	22765AR614.pak	2.5L NA, CVT	22765AR610 22765AR611 22765AR612 22765AR613	73EC24BE	XE1R600z00G

SERVICE PROCEDURE FLOWCHART

SERVICE PROCEDURE/INFORMATION

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

STEP 2:  Are any of the diagnostic trouble codes listed below also stored within 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. Refer to STIS: Engine > EMISSION CONTROL (AUS. EMISSION CONTROL DEVICES) 

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

Have signs of water or oil been detected within 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 the 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