2019 Subaru Forester BaseFACTORY OEM SERVICE PROCEDURE

Check Brake Override System

CAUTION: Perform this test in a location where the driving can be checked safely, while paying sufficient attention to the vicinity. While driving, the traffic laws and regulations such as speed limit must always be observed.
  1. CHECK DTC  .
    1. Turn the ignition switch to ON.
    2. Read the DTC of all systems using the Subaru Select Monitor or a general scan tool. Ref. to COMMON(DIAG)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are any DTCs displayed? (Current malfunction)

    Yes

    Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)".

    No

    Go to  2 .

  2. READ DATA MONITOR  .

    Using the Subaru Select Monitor, read the value in [Stop Light Switch].

    NOTE: For detailed operation procedures, refer to the "Data Monitor". Ref. to COMMON(DIAG)>DATA MONITOR .

    Does the value of [Stop Light Switch] change according to brake pedal operation?

    Yes

    Go to  3 .

    No

    Check the stop light switch and relevant harness, and repair the defective part or replace when necessary. Ref. to LIGHTING SYSTEM>STOP LIGHT SYSTEM .

  3. CHECK BRAKE PEDAL  .

    Check the brake pedal. Ref. to BRAKE>BRAKE PEDAL>INSPECTION .

    Is the check result OK?

    Yes

    Go to  4 .

    No

    Adjust or replace the brake pedal. Ref. to BRAKE>BRAKE PEDAL .

  4. READ DATA MONITOR  .

    Using the Subaru Select Monitor, read the values in [Accelerator Pedal Pos.#1] and [Accelerator Pedal Pos.#2].

    NOTE: For detailed operation procedures, refer to the "Data Monitor". Ref. to COMMON(DIAG)>DATA MONITOR .

    Do the values of [Accelerator Pedal Pos.#1] and [Accelerator Pedal Pos.#2] change according to accelerator pedal operation?

    Yes

    Go to  5 .

    No

    Replace the throttle opening angle sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>THROTTLE BODY .

  5. READ DATA MONITOR  .

    Using Subaru Select Monitor, read the value of [Vehicle Speed] when driving at a constant speed of 16.1 km/h (10 MPH) or 64.4 km/h (40 MPH).

    CAUTION: During the driving test, the traffic laws and regulations such as speed limit must always be observed.
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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