DTC P2404/Reprogramming Files (09-107-23)

DTC P2404/REPROGRAMMING FILES

TECHNICAL SERVICE BULLETIN

APPLICABILITY

2019-23MY Ascent

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 diagnostic procedures outlined below.

PFC FILE INFORMATION

Model	MY	File Name	Old Part Number	New CID #
Ascent	23	22765AS631.pfc	22765AS630	LHBK240Y00G

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

PAK FILE APPLICABILITY

Model	MY	File Name	Old Part Number	Decryption Keyword	New CID #
Ascent	19	22765AL739.pak	22765AL730 22765AL731 22765AL732 22765AL733 22765AL734 22765AL735 22765AL736 22765AL737 22765AL738	0DDE2284	LT8DB00A
	20	22765AN506.pak	22765AN500 22765AN501 22765AN502 22765AN503 22765AN504 22765AN505	D0E053B2	LT8F600C00G
	21	22765AP824.pak	22765AP820 22765AP821 22765AP822 22765AP823	B681D094	LT8H600D00G
	22	22765AS003.pak	22765AS000 22765AS001 22765AS002	C3D40F22	LT8J500F00G

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

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. Once repaired, perform the reprogramming procedures outlined in STEP 11.

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 recommendations.

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