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Home >> Toyota >> 2015 >> Avalon Hybrid Limited >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Electronically Controlled Brake System - Diagnostic Codes (1 Of 2) - (Hybrid) >> Electronically Controlled Brake System >> DTC C1246/46: Master Cylinder Pressure Sensor Malfunction; DTC C1281/81: Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC) ; DTC C1364/61: Wheel Cylinder Pressure Sensor Malfunction [10/2014 - ] >> Procedure

DTC C1246/46: Master Cylinder Pressure Sensor Malfunction; DTC C1281/81: Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC) ; DTC C1364/61: Wheel Cylinder Pressure Sensor Malfunction [10/2014 - ]: Procedure

  1. CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION 
    1. Check the protrusion of the plunger (Refer to INSTALLATION [10/2014 - ] ).

      OK

      The stop light switch assembly is installed properly.

      HINT: 

      If the stop light switch assembly is not installed properly, adjust the protrusion of the plunger before proceeding to the next step.

    Result: 

    NG 

    ADJUST PROTRUSION OF PLUNGER 

    (Refer to INSTALLATION [10/2014 - ] )

    Result: 

    OK 

    See step  2

  2. READ VALUE USING TECHSTREAM (REGULATOR PRESSURE SENSOR) 
    1. Mount a pedal effort gauge and install LSPV gauges to the rear wheels (Refer to ON-VEHICLE INSPECTION [10/2014 - ] ).
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Select the Data List on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2014 - 10/2015] or DATA LIST / ACTIVE TEST [10/2015 - ] ).
      ABS/VSC/TRAC

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Regulator Pressure Sensor Output Regulator pressure sensor output / Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.10 to 0.90 V Reading increases when brake pedal is depressed
    5. Check the output value of the regulator pressure sensor as the brake pedal is depressed.

      Standard Voltage

      Brake Effort
      (N (kgf, lbf))      		 Regulator Pressure Sensor Output
      (V)      		 Rear Right Wheel Hydraulic Pressure
      (MPa (kgf/cm2 , psi))      		 Rear Left Wheel Hydraulic Pressure
      (MPa (kgf/cm2 , psi))
      100 (10, 22.5) 1.32 to 2.12 3.98 to 7.98 (40.6 to 81.3, 578 to 1157) 3.98 to 7.98 (40.6 to 81.3, 578 to 1157)
      200 (20, 45.0) 2.90 to 3.70 11.72 to 15.72 (119.6 to 160.2, 1700 to 2280) 11.72 to 15.72 (119.6 to 160.2, 1700 to 2280)

    Result: 

    NG 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    OK 

    See step  3

  3. READ VALUE USING TECHSTREAM (WHEEL CYLINDER PRESSURE SENSOR) 
    1. Install LSPV gauges to the front wheels (Refer to ON-VEHICLE INSPECTION [10/2014 - ] ).
    2. Select the Data List on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2014 - 10/2015] or DATA LIST / ACTIVE TEST [10/2015 - ] ).
      ABS/VSC/TRAC

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Wheel Cylinder Pressure Sensor Wheel cylinder pressure sensor / Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.10 to 0.90 V Reading increases when brake pedal is depressed
    3. Check the output values of the wheel cylinder pressure sensor at each hydraulic pressure during electronically controlled brake system control.

      Standard Voltage

      for Front Wheel Cylinder LH 

      Hydraulic Pressure
      (MPa (kgf/cm2 , psi))      		 Wheel Cylinder Pressure Sensor
      (V)
      2.0 (20.4, 290) 0.53 to 1.33
      5.0 (51.0, 725) 1.12 to 1.92
      7.0 (71.4, 1015) 1.52 to 2.32
      10.0 (102.0, 1451) 2.14 to 2.94

      for Front Wheel Cylinder RH 

      Hydraulic Pressure
      (MPa (kgf/cm2 , psi))      		 Wheel Cylinder Pressure Sensor
      (V)
      2.0 (20.4, 290) 0.53 to 1.33
      5.0 (51.0, 725) 1.12 to 1.92
      7.0 (71.4, 1015) 1.52 to 2.32
      10.0 (102.0, 1451) 2.14 to 2.94

    Result: 

    NG 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    OK 

    See step  4

  4. READ VALUE USING TECHSTREAM (BRAKE PEDAL STROKE SENSOR ASSEMBLY AND PRESSURE SENSOR COMPARISON) 
    1. Mount a pedal effort gauge and install LSPV gauges to the front and rear wheels (Refer to ON-VEHICLE INSPECTION [10/2014 - ] ).
    2. Select the Data List on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2014 - 10/2015] or DATA LIST / ACTIVE TEST [10/2015 - ] ).
      ABS/VSC/TRAC

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stroke Sensor Brake pedal stroke sensor assembly / Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.65 to 1.35 V Reading increases when brake pedal is depressed
      Stroke Sensor2 Brake pedal stroke sensor assembly 2 / Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 3.65 to 4.35 V Reading decreases when brake pedal is depressed
      Regulator Pressure Sensor Output Regulator pressure sensor output / Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.10 to 0.90 V Reading increases when brake pedal is depressed
      Wheel Cylinder Pressure Sensor Wheel cylinder pressure sensor / Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.10 to 0.90 V Reading increases when brake pedal is depressed
    3. Check the output value of the brake pedal stroke sensor assembly as the brake pedal is depressed.

      Standard Voltage

      Brake Effort
      (N (kgf, lbf))      		 Stroke Sensor
      (V)      		 Stroke Sensor2
      (V)      		 Regulator Pressure Sensor Output
      (V)      		 Wheel Cylinder Pressure Sensor
      (V)
      100 (10, 22.5) 1.65 to 2.35 2.65 to 3.35 1.32 to 2.12 1.14 to 1.94
      200 (20, 45.0) 2.38 to 3.08 1.92 to 2.62 2.90 to 3.70 2.49 to 3.29

    Result: 

    NG 

    REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    OK 

    See step  5

  5. RECONFIRM DTC 
    1. Turn the power switch off.
    2. Clear the DTCs (Refer to DTC CHECK / CLEAR [10/2014 - ] ).
    3. Perform a road test.
    4. Check if the same DTC is output (Refer to DTC CHECK / CLEAR [10/2014 - ] ).

      Result

      Result Proceed to
      DTCs C1246/46 and C1364/61 are not output. A
      DTCs C1246/46 and/or C1364/61 are output. B

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK 

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

    Result: 

    B 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

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