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Subaru Legacy BN/BS (2015-2019) Service Manual: Basic diagnostic procedure procedure

1. ENGINE

STEPCHECKYESNO

1.CHECK ENGINE START FAILURE.

1) Ask the customer when and how the trouble occurred using the interview check list. Check List for Interview > CHECK

2) Start the engine.

Does the engine start-

Basic Diagnostic Procedure > PROCEDURE

Inspection using “Diagnostics for Engine Starting Failure” Diagnostics for Engine Starting Failure

2.CHECK ILLUMINATION OF MALFUNCTION INDICATOR LIGHT.

Does the malfunction indicator light illuminate-

Basic Diagnostic Procedure > PROCEDURE

Inspection using “General Diagnostic Table”. General Diagnostic Table > INSPECTION

3.CHECK COMMUNICATION STATUS.

1) Turn the ignition switch to OFF.

2) Connect the Subaru Select Monitor or general scan tool to the data link connector.

3) Turn the ignition switch to ON, and run the Subaru Select Monitor or general scan tool.

NOTE:

Subaru Select Monitor

For detailed operation procedures, refer to the “Subaru Select Monitor”. Subaru Select Monitor

General scan tool

For detailed operation procedures, refer to the general scan tool operation manual.

Does Subaru Select Monitor or general scan tool communicate with vehicle normally-

Basic Diagnostic Procedure > PROCEDURE

Inspection using LAN system “Diagnostic Procedure with Diagnostic Trouble Code (DTC)”. Basic Diagnostic Procedure

4.CHECK DTC.

Read DTC using Subaru Select Monitor or general scan tool.

NOTE:

Subaru Select Monitor

For detailed operation procedures, refer to “Read Diagnostic Trouble Code (DTC)”. Read Diagnostic Trouble Code (DTC)

General scan tool

For detailed operation procedures, refer to the general scan tool operation manual.

Is DTC displayed on Subaru Select Monitor or general scan tool-

Record the DTC and freeze frame data. Repair the trouble cause. List of Diagnostic Trouble Code (DTC) After repair, go to the next step.

Basic Diagnostic Procedure > PROCEDURE

Repair the related parts.

NOTE:

If DTC is not shown on display although the malfunction indicator light illuminates, perform the diagnosis of malfunction indicator light circuit or combination meter. Malfunction Indicator Light

5.PERFORM DIAGNOSIS.

1) Perform the Clear Memory Mode. Clear Memory Mode

2) Perform the Inspection Mode or Drive Cycle. Inspection Mode Drive Cycle

Is DTC displayed on Subaru Select Monitor or general scan tool-

Inspect using “Diagnostic Procedure with Diagnostic Trouble Code (DTC)”.

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Finish the diagnosis.

Active test operation
CAUTION:After executing the system operation check mode, execute the Clear Memory Mode. Clear Memory Mode > OPERATIONNOTE:For detailed operation procedures, refer to “Application help”.*: ...

Check list for interview check
1. CHECK LIST NO. 1Check the following item when problem has occurred.NOTE:Use copies of this page for interviewing customers.Customer’s name Engine No. Date of purchase Fuel type Date of repair ...

Other materials:

Dtc p013b o2 sensor slow response - lean to rich bank 1 sensor 2
NOTE:For the diagnostic procedure, refer to DTC P013A. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P013A O2 SENSOR SLOW RESPONSE - RICH TO LEAN BANK 1 SENSOR 21. OUTLINE OF DIAGNOSISDetect the slow response of lean > rich for rear oxygen sensor output.After the deceleration fuel c ...

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