2019 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE

Check Brake Override System

WARNING: 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 OFF.
    2. Connect the Subaru Select Monitor to data link connector.
    3. Turn the ignition switch to ON.
    4. Turn the Subaru Select Monitor 4 to ON.
    5. Check the DTCs of the system that may be output.
      NOTE: Read the DTC using Subaru Select Monitor. Ref. to COMMON (DIAG)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is there any DTC output?

    Yes  : Check DTC using "Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

    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 "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .

    Is the value of [Stop Light Switch] changed to ON/OFF on the data monitor?

    Yes  : Go to  3.

    No  : Check the stop light circuit.

  3. CHECK BRAKE PEDAL. 

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

    Is the brake pedal 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] when operating the accelerator pedal from fully closed to fully open.

    NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .

    Does the values of [Accelerator Pedal Pos.#1] and [Accelerator Pedal Pos.#2] continuously change?

    Yes  : Go to  5.

    No  : Replace the accelerator pedal. Ref. to SPEED CONTROL SYSTEMS (H4DOTC)>ACCELERATOR PEDAL .

  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).

    WARNING: During the driving test, the traffic laws and regulations such as speed limit must always be observed.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.