LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2019 >> Mirai >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System - Diagnostic Codes (1 Of 2) >> 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 [06/2015 - ] >> 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 [06/2015 - ]: Procedure

  1. CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION 
    1. Check the protrusion of the plunger.

      Refer to INSTALLATION [06/2015 - ]

      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

      Proceed to
      OK
      NG

    Result: 

    NG 

    ADJUST PROTRUSION OF SHAFT. Refer to  INSTALLATION [06/2015 - ] 

    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 [06/2015 - ]

    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 [06/2015 - ]

      Chassis > ABS/VSC/TRAC > Data List 

      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

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      Regulator Pressure Sensor Output
    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) 1.50 to 2.30 4.88 to 8.88 MPa (49.8 to 90.6 kgf/cm2 , 708 to 1288 psi) 4.88 to 8.88 MPa (49.8 to 90.6 kgf/cm2 , 708 to 1288 psi)
      200 (20, 45.0) 3.37 to 4.17 14.01 to 18.01 MPa (142.9 to 183.7 kgf/cm2 , 2031 to 2611 psi) 14.01 to 18.01 MPa (142.9 to 183.7 kgf/cm2 , 2031 to 2611 psi)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    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 [06/2015 - ]

    2. Select the Data List on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [06/2015 - ]

      Chassis > ABS/VSC/TRAC > Data List 

      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

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      Wheel Cylinder Pressure Sensor
    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

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    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 [06/2015 - ]

    2. Select the Data List on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [06/2015 - ]

      Chassis > ABS/VSC/TRAC > Data List 

      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
      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
      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

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      Regulator Pressure Sensor Output
      Stroke Sensor
      Stroke Sensor2
      Wheel Cylinder Pressure Sensor
    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) 1.26 to 1.96 3.04 to 3.74 1.50 to 2.30 1.30 to 2.10
      200 (20, 45.0) 1.74 to 2.44 2.56 to 3.26 3.37 to 4.17 2.89 to 3.69

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    OK 

    See step  5

  5. RECONFIRM DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    2. Turn the power switch off.
    3. Perform a road test.
    4. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      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 [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

    Result: 

    B 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

scientia non olet · About LEMON Manuals