2016 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE

Basic Diagnostic Procedure: Procedure

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. PERFORM CUSTOMER INTERVIEW  .

    Ask the customer when and how the trouble occurred using the Check List for Interview. Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>CHECK LIST FOR INTERVIEW 

    Did you interview the customer?

    Yes  : Go to  2.

    No  : Perform the interview, and Go to  2.

  2. BASIC INSPECTION  .

    Perform basic inspection. Ref. to FRONT RELAY CONTROL MODULE (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 (DIAGNOSTICS)>DATA LINK CONNECTOR
    3. Turn the ignition switch to ON and run the Subaru Select Monitor.
    4. Select [Front Relay Control Module].
      NOTE:

      For detailed operation procedures, refer to "Help" of application. 

    Is communication possible?

    Yes  : Go to  4.

    No  : Check the communication circuit. Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE FOR SUBARU SELECT MONITOR COMMUNICATION>INSPECTION 

  4. CHECK DTC  .
    1. Read the DTC of [Front Relay Control Module] using the Subaru Select Monitor. Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 
    2. Record all DTCs and time stamp.
      NOTE:

      For time stamp, refer to LAN system. Ref. to  LAN SYSTEM (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION>TIME STAMP 

    Are any DTCs displayed? (Current code)

    Yes  : Record the DTC, time stamp and freeze frame data, and Go to  5.

    No  : Finish the diagnosis.

  5. PERFORM DIAGNOSIS  .
    1. Perform the diagnosis according to the displayed DTC. Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST 
    2. Repair or replace the cause of trouble.
    3. Using the Subaru Select Monitor, perform the clear memory of [Front Relay Control Module]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY
    4. Execute the inspection mode. Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>INSPECTION MODE 
    5. Read the DTC of [Front Relay Control Module] using the Subaru Select Monitor. Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

    Are any DTCs displayed? (Current code)

    Yes  : Repeat step  5 until DTC is not shown. Go to  5.

    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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