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CHECK ENGINE START FAILURE .
1. Ask the customer when and how the trouble occurred using the interview check list. Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Check List for Interview>CHECK .
2. Start the engine.
Does the engine start?

Yes: Go to 2

No: Inspection using "Diagnostics for Engine Starting Failure" Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Diagnostics for Engine Starting Failure .
CHECK ILLUMINATION OF MALFUNCTION INDICATOR LIGHT .
Does the malfunction indicator light illuminate?

Yes: Go to 3

No: Inspection using "General Diagnostic Table". Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>General Diagnostic Table .
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". Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Subaru Select Monitor .
  - General scan tool
    For detailed operation procedures, refer to the general scan tool operation manual.
Does Subaru Select Monitor communicate with vehicle normally?

Yes: Go to 4

No: Inspection using "Basic Diagnostic Procedure" of LAN system Ref. to LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure .
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)". Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>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? (Current malfunction)

Yes: Record DTC, time stamp, and freeze frame data, then repair the trouble cause. Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>List of Diagnostic Trouble Code (DTC) . after repair, go to the next step. Go to 5
NOTE:
- For the time stamp, refer to LAN article. Ref. to LAN SYSTEM (DIAGNOSTICS)>General Description>CAUTION>TIME STAMP .
- Depending on DTCs, time stamp may not be stored.
No: 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. Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Malfunction Indicator Light .
PERFORM DIAGNOSIS .
1. Perform the Clear Memory Mode. Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Clear Memory Mode .
2. Perform the Inspection Mode or Drive Cycle. Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Inspection Mode . Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Drive Cycle .
Is DTC displayed on Subaru Select Monitor or general scan tool?

Yes: Inspect using "Diagnostic Procedure with Diagnostic Trouble Code (DTC)".

Ref. to WRX (2.0L) .

No: Finish the diagnosis.

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.

Safety Warning

Basic Diagnostic Procedure: Procedure: Engine

Use the Manual With the Right Hardware

When to See a Mechanic

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