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Home >> Subaru >> 2019 >> BRZ Series.Gray >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (System & Circuit Tests) >> EFI System (FA20) >> Brake Override System >> Inspection steps

Inspection steps

Drive the vehicle approx. at 10 km/h {6.25 MPH}, and depress the accelerator pedal ASSY by half or by 3/4 of the way.

While holding the depressed accelerator pedal ASSY, depress the brake pedal with your left foot. When the engine speed drops approx. to 1000 r/min at this time, it is possible to determine that the control operates normally.

WARNING: Perform this test in the place where a drive check can be done safely, and pay special attention to the circumstance of the vehicle. Observe the traffic law such as legal speed limit when driving.
NOTE:
  • Normally, the value for the accelerator pedal opening angle in the data monitor changes according to the value for the accelerator sensor No. 1 voltage ratio. (Values are not the same. Refer to DATA MONITOR/ACTIVE TEST )
  • When the value for the accelerator sensor No. 1 voltage ratio is constant, it is possible to determine that the control operates even if the accelerator pedal opening angle and the accelerator sensor No. 1 voltage ratio in the data monitor differ from each other and the value for the accelerator pedal opening is fluctuating as well. (Using the data storage function of the SSM4, the data obtained during driving can be recorded. The recorded data can be checked after driving.)
  • If a concern arises from a customer that the vehicle decelerates when he/she intentionally depresses the accelerator pedal and brake pedal simultaneously, ask the customer not to depress both pedals at the same time. (Example: While operating the accelerator pedal, operate the brake pedal with left foot.)
  1. Read DTC
    1. Connect the SSM4 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Select the following menu items using the SSM4.: [Each System]/[Engine Control System]/[DTC]
    4. Check the DTC for the system that has been output.
    RESULT DESCRIPTION

    Result Go to
    No DTC is output A
    DTC is output. B

    B: To corresponding DTC chart

    A: Go to next step

  2. Reading of SSM4 data ([Stop Light Switch])
    1. Connect the SSM4 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn on the SSM4.
    4. Select the following menu items using the SSM4.: [Each System]/[Engine Control System]/[Data monitor]/[Stop Light Switch]
    5. Read the data display.
    Item name Inspection conditions Criteria
    [Stop Light Switch] Brake pedal is depressed. ON
    Brake pedal is released. OFF

    NG: Stop light circuit check (Refer to HOW TO TROUBLESHOOT )

    OK: Go to next step

  3. Check brake pedal support ASSY
    1. Check and adjust the brake pedal. (Refer to ADJUSTMENT )
    NOTE: When ON operation of the stop light switch ASSY is delayed, the control is also delayed. If the switch is turned on earlier, the operation starts accordingly at an early point. Therefore, check the brake pedal and stop light switch ASSY.

    NG: Check and replacement of brake pedal support ASSY

    OK: Go to next step

  4. Reading of SSM4 data (Accelerator Pedal Pos.#1, Accelerator Pedal Pos.#2)
    1. Connect the SSM4 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn on the SSM4.
    4. Check DTC using SSM4.
    5. Read the data display.
    INSPECTION CONDITION - CRITERIA

    Inspection conditions Criteria
    Accelerator pedal is fully closed →fully open. Changes continuously.
    NOTE: Refer to DATA MONITOR/ACTIVE TEST for normal value of [Accelerator Pedal Pos.#1] and [Accelerator Pedal Pos.#2] when the accelerator pedal is operated.

    NG: Replacement of accelerator pedal sensor ASSY (Refer to ACCELERATOR PEDAL ROD ASSY (FA20) )

    OK: Go to next step

  5. Reading of SSM4 data ([Vehicle Speed])
    1. Connect the SSM4 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn on the SSM4.
    4. Start the engine.
    5. Select the following menu items using the SSM4.: [Each System]/[Engine Control System]/[Data monitor]/[Vehicle Speed]
    INSPECTION CONDITION - CRITERIA

    Inspection conditions Criteria
    Vehicle is parked. 0 km/h {0 MPH}
    Vehicle is running at a constant speed. (16.1 to 64.4 km/h) {10 to 40 MPH} Significant fluctuation is not observed in the displayed speed.
    WARNING: When performing the driving test, always observe the applicable traffic laws such as the speed limit.
    NOTE: Using the data storage function of the SSM4, the data obtained during driving can be recorded. The recorded data can be checked after driving.

    NG: Go to meter & gauge system (Refer to SPEED METER MALFUNCTION )

    OK: Go to next step

    Complete

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