Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSSUBARU2016LEGACY 2.5IREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTINFOTAINMENTINFOTAINMENT SYSTEM (DIAGNOSTICS)BASIC DIAGNOSTIC PROCEDUREPROCEDURE

2016 Subaru Legacy 2.5i

Basic Diagnostic Procedure: Procedure

2016 Subaru Legacy 2.5iSECTION Procedure

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 PERFORM CUSTOMER INTERVIEW. Using the Check List for Interview, ask the customer the condition of how trouble occurs.	Did you interview the customer?	Go to step 2 .	Interview the customer. < Ref. to CHECK , Check List for Interview. >
2 CHECK SUBARU SELECT MONITOR COMMUNICATION. Check for communication with the infotainment system. NOTE: If the communication function of the Subaru Select Monitor cannot be executed properly, check the communication circuit. < Ref. to INSPECTION , Subaru Select Monitor. >	Is communication possible?	Go to step 3 .	Check the communication circuit.
3 CHECK DTC. Using the Subaru Select Monitor, read DTC of the infotainment system. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Is DTC displayed?	Perform the diagnosis according to DTC. < Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > After diagnosis, Go to step 6 .	Go to step 4 .
4 PERFORM DIAGNOSTICS WITH PHENOMENON. Check the list of Diagnostics with Phenomenon. < Ref. to DIAGNOSTICS WITH PHENOMENON . >	Does the symptom apply?	Perform diagnosis according to the procedures in the diagnostics with phenomenon.	Go to step 5 .
5 CHECK TROUBLE PHENOMENON. Perform the basic inspection. < Ref. to INSPECTION , General Description. > Check the control module I/O signal. < Ref. to ELECTRICAL SPECIFICATION , Control Module I/O Signal. > Perform check of current data. < Ref. to READ CURRENT DATA . >	Was the trouble cause found?	Perform the Clear Memory after repairing or replacing the cause of trouble. < Ref. to CLEAR MEMORY MODE . >	System is normal.
6 PERFORM DIAGNOSIS. Perform the Clear Memory Mode. < Ref. to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Ref. to INSPECTION MODE . >	Is DTC displayed?	Perform the diagnosis according to DTC. < Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >	Finish the diagnosis.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.