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Home >> Toyota >> 2015 >> Avalon Hybrid Limited >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System - Diagnostic Codes (8 Of 8) - Symptom & Circuit Tests - (Hybrid) >> Hybrid Control System >> Circuit Tests >> Brake Override System Circuit [10/2014 - 10/2015] >> Procedure

Brake Override System Circuit [10/2014 - 10/2015]: Procedure

  1. CHECK DTC OUTPUT (HEALTH CHECK) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: System Select / Health Check.
    4. Check DTCs.
      Result Proceed to
      No DTCs are output. A
      DTCs are output. B
    5. Turn the power switch off.

    Result: 

    B 

    GO TO APPLICABLE DTC CHART 

    Result: 

    A 

    See step  2

  2. READ VALUE USING TECHSTREAM (MASTER CYLINDER CTRL TRQ) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Data List / Master Cylinder Ctrl Trq.
    4. Read the value displayed on the Techstream.
      Tester Display Measurement Item/Range Normal Condition
      Master Cylinder Ctrl Trq Master cylinder control torque/
      Min.: -4096 Nm, Max.: 4095 Nm      		 Brake pedal depressed: Changes with the brake pedal pressure
      Brake pedal released: 0 Nm

      Result

      Result Proceed to
      Displayed value changes according to the brake pedal pressure. A
      Displayed speed value does not change according to the brake pedal pressure. B
    5. Turn the power switch off.

    Result: 

    B 

    CHECK BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

    (Refer to ON-VEHICLE INSPECTION [10/2014 - ] )

    Result: 

    A 

    See step  3

  3. READ VALUE USING TECHSTREAM (ACCEL PEDAL POS #1, ACCEL PEDAL POS #2) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Data List / Accel Pedal Pos #1, Accel Pedal Pos #2.
    4. Read the value displayed on the Techstream.
      Tester Display Measurement Item/Range Normal Condition
      Accel Pedal Pos #1 Accelerator pedal position sensor No. 1/
      Min.: 0%, Max.: 100%      		 Accelerator pedal released → depressed → released: Changes with accelerator pedal pressure
      Accel Pedal Pos #2 Accelerator pedal position sensor No. 2/
      Min.: 0%, Max.: 100%

      Result

      Result Proceed to
      Displayed values smoothly change following accelerator pedal operation. A
      Displayed values do not smoothly change following accelerator pedal operation. B
    5. Turn the power switch off.

    Result: 

    B 

    REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY 

    (Refer to COMPONENTS [10/2014 - ] )

    Result: 

    A 

    See step  4

  4. READ VALUE USING TECHSTREAM (VEHICLE SPD) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Data List / Vehicle Spd.
    4. Read the value displayed on the Techstream.
      Tester Display Measurement Item/Range Normal Condition
      Vehicle Spd Vehicle speed/
      Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)      		 Vehicle stopped: 0 km/h (0 mph)
      No large fluctuations when driving at a constant speed: Vehicle running at constant speed between 16 to 64 km/h (10 to 40 mph)

      Result

      Result Proceed to
      Displayed speed value does not fluctuate. A
      Displayed speed value fluctuates. B
      WARNING:

      Perform this road test only in an appropriate safe location, in accordance with all local laws.

      HINT: 

      Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.

    5. Turn the power switch off.

    Result: 

    B 

    GO TO METER / GAUGE SYSTEM 

    (Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] )

    Result: 

    A 

    See step  5

  5. READ VALUE USING TECHSTREAM (FR, FL, RR, RL WHEEL SPEED) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (READY).
    3. Enter the following menus: Chassis / ABS/VSC/TRAC / Data List / All Data / FR Wheel Speed, FL Wheel Speed, RR Wheel Speed and RL Wheel Speed.
    4. Read the value displayed on the Techstream.
      Tester Display Measurement Item/Range Normal Condition
      FR Wheel Speed Front speed sensor RH /
      Min.: 0 km/h (0 mph), Max.: 326 km/h (203 mph)      		 Vehicle stopped: 0 km/h (0 mph)
      No large fluctuations when driving at a constant speed: Vehicle running at constant speed between 16 to 64 km/h (10 to 40 mph)
      FL Wheel Speed Front speed sensor LH /
      Min.: 0 km/h (0 mph), Max.: 326 km/h (203 mph)
      RR Wheel Speed Rear speed sensor RH /
      Min.: 0 km/h (0 mph), Max.: 326 km/h (203 mph)
      RL Wheel Speed Rear speed sensor LH /
      Min.: 0 km/h (0 mph), Max.: 326 km/h (203 mph)

      Result

      Result Proceed to
      Displayed speed value does not fluctuate. A
      Displayed speed value fluctuates. B
      WARNING:

      Perform this road test only in an appropriate safe location, in accordance with all local laws.

      HINT: 

      Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.

    5. Turn the power switch off.

    Result: 

    A 

    END 

    Result: 

    B 

    INSPECT FRONT OR REAR SPEED SENSOR 

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