2020 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE

Basic Diagnostic Procedure: Procedure

  1. PERFORM CUSTOMER INTERVIEW. 

    Ask the customer when and how the trouble occurred using the interview checklist. Ref. to MULTI-FUNCTION DISPLAY (DIAGNOSTICS)>CHECK LIST FOR INTERVIEW .

    Did you interview the customer?

    Yes  : Go to  2.

    No  : Perform the interview, and Go to  2.

  2. PERFORM BASIC INSPECTION. 

    Perform basic inspection. Ref. to MULTI-FUNCTION DISPLAY (DIAGNOSTICS)>GENERAL DESCRIPTION>INSPECTION .

    Is the check result OK?

    Yes  : Go to  3.

    No  : Repair the faulty part found in basic inspection, and Go to  3.

  3. CHECK SUBARU SELECT MONITOR COMMUNICATION. 
    1. Turn the ignition switch to OFF.
    2. Connect the Subaru Select Monitor to data link connector. Ref. to COMMON (DIAG)>DATA LINK CONNECTOR .
    3. Turn the ignition switch to ON and run the Subaru Select Monitor.
    4. Select [Multi-Function Display].
    NOTE: For detailed operation procedures, refer to "Help" of application.

    Is communication possible?

    Yes  : Go to  4.

    No  : Check the communication circuit. Ref. to MULTI-FUNCTION DISPLAY (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE FOR SUBARU SELECT MONITOR COMMUNICATION .

  4. CHECK CAN COMMUNICATION. 

    Perform the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

    Is the check result OK?

    Yes  : Go to  5.

    No  : Perform the inspection according to the diagnosis for LAN system.

  5. CHECK MFD. 

    Read the DTC of [Multi-Function Display] using the Subaru Select Monitor. Ref. to MULTI-FUNCTION DISPLAY (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are any DTCs displayed? (Current malfunction)

    Yes  : Record the DTC, time stamp and freeze frame data, and Go to  7.

    No  : Go to  6.

  6. CHECK MFD. 

    Check MFD operation. Ref. to MULTI-FUNCTION DISPLAY (DIAGNOSTICS)>ACTIVE TEST .

    Is the check result OK?

    Yes  : System is normal. Ref. to MULTI-FUNCTION DISPLAY (DIAGNOSTICS)>ACTIVE TEST .

    No  : Replace the MFD. Ref. to INSTRUMENTATION/DRIVER INFO>COMBINATION METER .

  7. PERFORM DIAGNOSIS. 
    1. Perform the diagnosis for the displayed DTCs.
    2. Repair or replace the cause of trouble.
    3. Using the Subaru Select Monitor, perform the clear memory of [Multi-Function Display]. Ref. to COMMON (diag)>CLEAR MEMORY .
    4. Execute the inspection mode.
    5. Read the DTC of [Multi-Function Display] using the Subaru Select Monitor. Ref. to MULTI-FUNCTION DISPLAY (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are any DTCs displayed? (Current malfunction)

    Yes  : Repeat step  7 until DTC is not shown. Go to  7.

    No  : Finish the diagnosis.

Factory Service Tools

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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.

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