Basic Diagnostic Procedure: Procedure: Engine

1. CHECK ENGINE START FAILURE. 
   1. Ask the customer when and how the trouble occurred using the interview check list. Refer 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". Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>DIAGNOSTICS FOR ENGINE STARTING FAILURE .

2. CHECK ILLUMINATION OF MALFUNCTION INDICATOR LIGHT. 

   Check the lighting condition of the malfunction indicator light.

   Does the malfunction indicator light illuminate?

   Yes:  Go to  3.

   No:  Inspection using "General Diagnostic Table". Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>GENERAL DIAGNOSTIC TABLE .

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". Refer 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. Refer to LAN SYSTEM (DIAGNOSTICS)>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)". Refer 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. Refer 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 instructions. Refer 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. Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>MALFUNCTION INDICATOR LIGHT .
5. PERFORM DIAGNOSIS. 

1. Perform the Clear Memory Mode. Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>CLEAR MEMORY MODE .
2. Perform the Inspection Mode or Drive Cycle. Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>INSPECTION MODE . Refer 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)". Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) .

No:  Finish the diagnosis.