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

Subaru Legacy BN/BS (2015-2019) Service Manual / Lan system (diagnostics) / Basic diagnostic procedure procedure

CAUTION:

• Remove foreign matter (dust, water, oil, etc.) from each control module connector during removal and installation.

• Registration of immobilizer may be needed after the replacement of control modules, etc. For detailed procedure, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER”.

NOTE:

• To check harness for open or short circuits, shake the suspected trouble spot or connector.

• Check List for Interview Check List for Interview

STEP	CHECK	YES	NO
1.CHECK PRE-INSPECTION. Ask the customer when and how the trouble occurred using the interview check list. Check List for Interview	Did you interview the customer-	Basic Diagnostic Procedure > PROCEDURE	Interview the customer.
2.BASIC INSPECTION (CAN DIAGNOSTIC IS NOT USED). Check components which might affect CAN communication problem. General Description > INSPECTION	Is the component that might affect CAN communication problem normal-	Basic Diagnostic Procedure > PROCEDURE	Repair or replace each component.
3.CHECK COMMUNICATION FOR INITIALIZING. Communicate with the all systems by connecting the Subaru Select Monitor.	Is the communication for initializing finished for all modules-	Basic Diagnostic Procedure > PROCEDURE	Check the error of communication for initializing. Subaru Select Monitor > COMMUNICATION FOR INITIALIZING IMPOSSIBLE
4.BASIC INSPECTION (CAN DIAGNOSTIC IS USED). Check components which might affect CAN communication problem. General Description > INSPECTION	Is the component that might affect CAN communication problem normal-	Basic Diagnostic Procedure > PROCEDURE	Repair or replace each component.
5.CHECK DTC. 1) Start the engine and read all DTCs. NOTE: When the engine does not start, perform the diagnosis for the engine start malfunction. Diagnostics for Engine Starting Failure Diagnostics for Engine Starting Failure 2) Record all DTCs, time stamp and freeze frame data. NOTE: For time stamp, refer to “TIME STAMP” of General Description. General Description > CAUTION	Is DTC U**** displayed-	Basic Diagnostic Procedure > PROCEDURE	Basic Diagnostic Procedure > PROCEDURE
6.CHECK DTC. 1) Perform the inspection using the DTC check sheet. List of Diagnostic Trouble Code (DTC) > LIST 2) Using the Subaru Select Monitor, read all DTCs.	Is DTC U**** displayed-	Basic Diagnostic Procedure > PROCEDURE	Basic Diagnostic Procedure > PROCEDURE
7.PERFORM GENERAL DIAGNOSTICS. Inspect using the “General Diagnostic Table”. General Diagnostic Table	Is result of inspection OK-	LAN system is normal.	Basic Diagnostic Procedure > PROCEDURE
8.PERFORM DIAGNOSIS. 1) Correct the cause of trouble. 2) Perform the Clear Memory Mode. Clear Memory Mode > OPERATION 3) Read the DTC. Read Diagnostic Trouble Code (DTC) > OPERATION	Is DTC displayed-	Repeat step 8 until DTC is not shown.	Finish the diagnosis.

Lan system (diagnostics)

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