ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1246/46, C1281/81, C1364/61

DTC Code DTC Name
C1246/46 Master Cylinder Pressure Sensor Malfunction
C1281/81 Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC)
C1364/61 Wheel Cylinder Pressure Sensor Malfunction

DESCRIPTION

The master cylinder pressure sensor and the wheel cylinder pressure sensor are built into the brake actuator assembly, and measure the master cylinder pressure and the wheel cylinder pressure sent to the skid control ECU assembly.

DTC C1281/81 will be cleared when the master cylinder pressure sensor sends a master cylinder pressure signal or when Test Mode ends. DTC C1281/81 is output only in Test Mode.

DTC Code INF Code DTC Detection Condition Trouble Area
C1246/46 191 Sensor power source 1 (VCM) voltage is 4.7 V or less or 5.3 V or more for at least 0.05 seconds.

  • Brake actuator assembly (Master cylinder pressure sensor)

  • Master cylinder pressure sensor circuit

  • Master cylinder pressure sensor power supply

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 192 Master cylinder pressure sensor output voltage 1 (PMC1) is less than 0.25 V or 4.53 V or more for at least 0.05 seconds.

  • Brake actuator assembly (Master cylinder pressure sensor)

  • Master cylinder pressure sensor circuit

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 194 Sensor power source 2 (VCM2) voltage is 4.7 V or less or 5.3 V or more for at least 0.05 seconds.

  • Brake actuator assembly (Master cylinder pressure sensor)

  • Master cylinder pressure sensor circuit

  • Master cylinder pressure sensor power supply

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 195 Master cylinder pressure sensor output voltage 2 (PMC2) is less than 0.25 V or 4.53 V or more for at least 0.05 seconds.

  • Brake actuator assembly (Master cylinder pressure sensor)

  • Master cylinder pressure sensor circuit

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 197 Master cylinder pressure sensor output voltage 1 (PMC1) is abnormal.

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 198 Master cylinder pressure sensor output voltage 2 (PMC2) is abnormal. ↑
↑ 199 Master cylinder pressure sensor output voltage 1 (PMC1) is less than 0.33 V or 0.85 V or more when not braking.

  • Brake actuator assembly (Master cylinder pressure sensor)

  • Master cylinder pressure sensor circuit

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 200 Master cylinder pressure sensor output voltage 2 (PMC2) is less than 0.33 V or 0.85 V or more when not braking. ↑
↑ 201

Either of the following is detected:


  1. PMC1 and PMC2 voltages are different.

  2. Master cylinder pressure sensor has a fluctuation of 15 MPa or more continuously for 0.054 seconds within a 0.6 second interval.

 ↑
↑ 202 Condition that output voltage of front wheel cylinder pressure sensor RH (PFR) and rear wheel cylinder pressure sensor LH (PRL) is less than 0.25 V or 4.53 V or more continues for 0.05 seconds or more.

  • Master cylinder pressure sensor power supply

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 205 Condition that output voltage of front wheel cylinder pressure sensor LH (PFL) is less than 0.25 V or 4.53 V or more and rear wheel cylinder pressure sensor RH (PRR) is 0.25 V or more or 4.53 V or more continues for 0.05 seconds or more. ↑
C1364/61 221 Sensor power source 1 (VCM) voltage is 4.7 V or less or 5.3 V or more for at least 0.05 seconds.

  • Wheel cylinder pressure sensor power supply

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 222 Front wheel cylinder pressure sensor RH output voltage (PFR) is 0.25 V or less or 4.53 V or more for at least 0.05 seconds.

  • Brake actuator assembly (Wheel cylinder pressure sensor)

  • Wheel cylinder pressure sensor circuit

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 224

Either of the following is detected:


  1. Front wheel cylinder pressure sensor RH output (PFR) is 0.33 V or less or 0.85 V or more for least 3 seconds when not braking.

  2. Front wheel cylinder pressure sensor RH output (PFR) is 0.33 V or less for at least 0.1 seconds when braking.

 ↑
↑ 225 The front wheel cylinder pressure sensor RH output (PFR) output voltage is stuck at 4.53 V or less. ↑
↑ 227 Sensor power source 2 (VCM2) voltage is 4.7 V or less or 5.3 V or more for at least 0.05 seconds.

  • Wheel cylinder pressure sensor power supply

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 228 Front wheel cylinder pressure sensor LH output voltage (PFL) is 0.25 V or less or 4.53 V or more for at least 0.05 seconds.

  • Brake actuator assembly (Wheel cylinder pressure sensor)

  • Wheel cylinder pressure sensor circuit

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 230

Either of the following is detected:


  1. Front wheel cylinder pressure sensor LH output (PFL) is 0.33 V or less or 0.85 V or more for least 3 seconds when not braking.

  2. Front wheel cylinder pressure sensor LH output (PFL) is 0.33 V or less for at least 0.1 seconds when braking.

 ↑
↑ 231 The front wheel cylinder pressure sensor LH output (PFL) output voltage is stuck at 4.53 V or less. ↑
↑ 233 Sensor power source 2 (VCM2) voltage is 4.7 V or less or 5.3 V or more for at least 0.05 seconds.

  • Wheel cylinder pressure sensor power supply

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 234 Rear wheel cylinder pressure sensor RH output voltage (PRR) is 0.25 V or less or 4.53 V or more for at least 0.05 seconds.

  • Brake actuator assembly (Wheel cylinder pressure sensor)

  • Wheel cylinder pressure sensor circuit

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 236

Either of the following is detected:


  1. Rear wheel cylinder pressure sensor RH output (PRR) is 0.33 V or less or 0.85 V or more for at least 3 seconds when not braking.

  2. Rear wheel cylinder pressure sensor RH output (PRR) is 0.33 V or less for at least 0.1 seconds when braking.

 ↑
↑ 237 The rear wheel cylinder pressure sensor RH output (PRR) output voltage is stuck at 4.53 V or less. ↑
↑ 239 Sensor power source 1 (VCM) voltage is 4.7 V or less or 5.3 V or more for at least 0.05 seconds.

  • Wheel cylinder pressure sensor power supply

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 240 Rear wheel cylinder pressure sensor LH output voltage (PRL) is 0.25 V or less or 4.53 V or more for at least 0.05 seconds.

  • Brake actuator assembly (Wheel cylinder pressure sensor)

  • Wheel cylinder pressure sensor circuit

  • Brake actuator assembly

  • Skid control ECU assembly
↑ 242

Either of the following is detected:


  1. Rear wheel cylinder pressure sensor LH output (PRL) is 0.33 V or less or 0.85 V or more for at least 3 seconds when not braking.

  2. Rear wheel cylinder pressure sensor LH output (PRL) is 0.33 V or less for at least 0.1 seconds when braking.

 ↑
↑ 243 The rear wheel cylinder pressure sensor LH output (PRL) output voltage is stuck at 4.53 V or less. ↑
C1281/81 - Detected only during Test Mode.

  • Stop light switch assembly

  • Master cylinder pressure sensor

WIRING DIAGRAM

A01FQXXE10

INSPECTION PROCEDURE

Note

When replacing the skid control ECU assembly or brake actuator assembly, perform initialization and calibration of the linear solenoid valve Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)


    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    2. Disconnect the A14 and A16 skid control ECU assembly connectors and the A12 brake actuator assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A14-27 (VCM) - A12-35 (VCM) Always Below 1 Ω
      A14-27 (VCM) - Body ground Always 10 kΩ or higher
      A14-26 (PAC1) - A12-46 (PAC1) Always Below 1 Ω
      A14-26 (PAC1) - Body ground Always 10 kΩ or higher
      A14-14 (PMC1) - A12-38 (PMC1) Always Below 1 Ω
      A14-14 (PMC1) - Body ground Always 10 kΩ or higher
      A14-44 (PFR) - A12-34 (PFR) Always Below 1 Ω
      A14-44 (PFR) - Body ground Always 10 kΩ or higher
      A14-42 (PRL) - A12-36 (PRL) Always Below 1 Ω
      A14-42 (PRL) - Body ground Always 10 kΩ or higher
      A14-28 (E) - A12-45 (E) Always Below 1 Ω
      A14-28 (E) - Body ground Always 10 kΩ or higher
      A14-9 (PCK1) - A12-37 (PCK1) Always Below 1 Ω
      A14-9 (PCK1) - Body ground Always 10 kΩ or higher
      A16-28 (VCM2) - A12-40 (VCM2) Always Below 1 Ω
      A16-28 (VCM2) - Body ground Always 10 kΩ or higher
      A16-14 (PMC2) - A12-43 (PMC2) Always Below 1 Ω
      A16-14 (PMC2) - Body ground Always 10 kΩ or higher
      A16-45 (PFL) - A12-39 (PFL) Always Below 1 Ω
      A16-45 (PFL) - Body ground Always 10 kΩ or higher
      A16-43 (PRR) - A12-41 (PRR) Always Below 1 Ω
      A16-43 (PRR) - Body ground Always 10 kΩ or higher
      A16-44 (E2) - A12-44 (E2) Always Below 1 Ω
      A16-44 (E2) - Body ground Always 10 kΩ or higher
      A16-7 (PCK2) - A12-42 (PCK2) Always Below 1 Ω
      A16-7 (PCK2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A14-27 (VCM) - A12-10 (VCM) Always Below 1 Ω
      A14-27 (VCM) - Body ground Always 10 kΩ or higher
      A14-26 (PAC1) - A12-15 (PAC1) Always Below 1 Ω
      A14-26 (PAC1) - Body ground Always 10 kΩ or higher
      A14-14 (PMC1) - A12-13 (PMC1) Always Below 1 Ω
      A14-14 (PMC1) - Body ground Always 10 kΩ or higher
      A14-44 (PFR) - A12-9 (PFR) Always Below 1 Ω
      A14-44 (PFR) - Body ground Always 10 kΩ or higher
      A14-42 (PRL) - A12-11 (PRL) Always Below 1 Ω
      A14-42 (PRL) - Body ground Always 10 kΩ or higher
      A14-28 (E) - A12-14 (E) Always Below 1 Ω
      A14-28 (E) - Body ground Always 10 kΩ or higher
      A14-9 (PCK1) - A12-12 (PCK1) Always Below 1 Ω
      A14-9 (PCK1) - Body ground Always 10 kΩ or higher
      A16-28 (VCM2) - A12-5 (VCM2) Always Below 1 Ω
      A16-28 (VCM2) - Body ground Always 10 kΩ or higher
      A16-14 (PMC2) - A12-8 (PMC2) Always Below 1 Ω
      A16-14 (PMC2) - Body ground Always 10 kΩ or higher
      A16-45 (PFL) - A12-4 (PFL) Always Below 1 Ω
      A16-45 (PFL) - Body ground Always 10 kΩ or higher
      A16-43 (PRR) - A12-6 (PRR) Always Below 1 Ω
      A16-43 (PRR) - Body ground Always 10 kΩ or higher
      A16-44 (E2) - A12-16 (E2) Always Below 1 Ω
      A16-44 (E2) - Body ground Always 10 kΩ or higher
      A16-7 (PCK2) - A12-7 (PCK2) Always Below 1 Ω
      A16-7 (PCK2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. READ VALUE USING GTS (MASTER CYLINDER PRESSURE SENSOR)


    1. Reconnect the skid control ECU assembly connectors and the brake actuator assembly connector.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Select the Data List on the GTS Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Master Cylinder Sensor Master cylinder pressure sensor 1 / Min.: 0.00 V, Max.: 5.00 V

      When brake pedal is released:

      0.3 to 0.7 V

      		 Reading increases when brake pedal is depressed
      Master Cylinder Sensor2 Master cylinder pressure sensor 2 / Min.: 0.00 V, Max.: 5.00 V

      When brake pedal is released:

      0.3 to 0.7 V

      		 Reading increases when brake pedal is depressed
      ECB* Solenoid (SMC1) Master cut solenoid (SMC1) / ON or OFF

      ON: Operating

      OFF: Not operating

      		 -
      ECB* Solenoid (SMC2) Master cut solenoid (SMC2) / ON or OFF

      ON: Operating

      OFF: Not operating

      		 -

      • *: Electronically Controlled Brake System

    5. Check the output value of the master cylinder pressure sensor as the brake pedal is depressed.

      OK
      Output voltage is proportional to pedal stroke, and there is not a large difference in output between sensor 1 and sensor 2.

      Tech Tips


      • If DTCs are stored due to the brake pedal being depressed, and electronically controlled brake system control is prohibited, check the Freeze Frame Data recorded at the time the DTCs were stored.

      • If the Freeze Frame Data shows that there are no abnormalities in the output of the master cylinder pressure sensors and no difference in the output between sensor 1 and sensor 2, proceed to the next step.


    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  3. READ VALUE USING GTS (WHEEL CYLINDER PRESSURE SENSOR)


    1. Turn the power switch off.

    2. Install a hydro LSPV gauge and bleed air Click here.

      SST
      09709-29018

    3. Turn the power switch on (IG).

    4. Select the Data List on the GTS Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR W/C Sensor Front wheel cylinder pressure sensor RH / Min.: 0.00 V, Max.: 5.00 V

      When brake pedal is released:

      0.3 to 0.7 V

      		 Reading increases when brake pedal is depressed
      FL W/C Sensor Front wheel cylinder pressure sensor LH / Min.: 0.00 V, Max.: 5.00 V

      When brake pedal is released:

      0.3 to 0.7 V

      		 Reading increases when brake pedal is depressed
      RR W/C Sensor Rear wheel cylinder pressure sensor RH / Min.: 0.00 V, Max.: 5.00 V

      When brake pedal is released:

      0.3 to 0.7 V

      		 Reading increases when brake pedal is depressed
      RL W/C Sensor Rear wheel cylinder pressure sensor LH / Min.: 0.00 V, Max.: 5.00 V

      When brake pedal is released:

      0.3 to 0.7 V

      		 Reading increases when brake pedal is depressed

    5. Check the output value of the wheel cylinder pressure sensor at each hydraulic pressure during electronically controlled brake system control.

      Standard Voltage
      Front Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2GR-FXE)
      except Sport Package

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Data List Display)

      FL W/C Sensor

      (Data List Display)
      3.84 (39.2, 557) 1.08 to 1.48 V 1.08 to 1.48 V
      5.29 (53.9, 767) 1.38 to 1.78 V 1.38 to 1.78 V
      Front Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2GR-FXE)
      for Sport Package

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Data List Display)

      FL W/C Sensor

      (Data List Display)
      3.19 (32.5, 463) 0.95 to 1.35 V 0.95 to 1.35 V
      4.85 (49.5, 703) 1.29 to 1.69 V 1.29 to 1.69 V
      Front Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2AR-FSE)
      Front Disc Brake Pad (Type A) / Rear Disc Brake Pad (Type A)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Data List Display)

      FL W/C Sensor

      (Data List Display)
      3.60 (36.7, 522) 1.04 to 1.44 V 1.04 to 1.44 V
      5.26 (53.6, 763) 1.37 to 1.77 V 1.37 to 1.77 V
      Front Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2AR-FSE)
      Front Disc Brake Pad (Type B) / Rear Disc Brake Pad (Type B)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Data List Display)

      FL W/C Sensor

      (Data List Display)
      2.57 (26.2, 373) 0.83 to 1.23 V 0.83 to 1.23 V
      4.76 (48.5, 690) 1.27 to 1.67 V 1.27 to 1.67 V
      Front Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2AR-FSE)
      Front Disc Brake Pad (Type B) / Rear Disc Brake Pad (Type A)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Data List Display)

      FL W/C Sensor

      (Data List Display)
      2.78 (28.3, 403) 0.87 to 1.27 V 0.87 to 1.27 V
      4.81 (49.0, 697) 1.28 to 1.68 V 1.28 to 1.68 V
      Front Wheel Cylinder Pressure Sensor: for 18 inch Front Disc Brake

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Data List Display)

      FL W/C Sensor

      (Data List Display)
      3.25 (33.1, 471) 0.96 to 1.36 V 0.96 to 1.36 V
      4.85 (49.5, 703) 1.29 to 1.69 V 1.29 to 1.69 V
      Rear Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2GR-FXE)
      except Sport Package

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Data List Display)

      RL W/C Sensor

      (Data List Display)
      3.84 (39.2, 557) 1.08 to 1.48 V 1.08 to 1.48 V
      5.29 (53.9, 767) 1.38 to 1.78 V 1.38 to 1.78 V
      Rear Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2GR-FXE)
      for Sport Package

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Data List Display)

      RL W/C Sensor

      (Data List Display)
      3.19 (32.5, 463) 0.95 to 1.35 V 0.95 to 1.35 V
      4.85 (49.5, 703) 1.29 to 1.69 V 1.29 to 1.69 V
      Rear Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2AR-FSE)
      Front Disc Brake Pad (Type A) / Rear Disc Brake Pad (Type A)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Data List Display)

      RL W/C Sensor

      (Data List Display)
      3.60 (36.7, 522) 1.04 to 1.44 V 1.04 to 1.44 V
      5.26 (53.6, 763) 1.37 to 1.77 V 1.37 to 1.77 V
      Rear Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2AR-FSE)
      Front Disc Brake Pad (Type B) / Rear Disc Brake Pad (Type B)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Data List Display)

      RL W/C Sensor

      (Data List Display)
      2.57 (26.2, 373) 0.83 to 1.23 V 0.83 to 1.23 V
      4.76 (48.5, 690) 1.27 to 1.67 V 1.27 to 1.67 V
      Rear Wheel Cylinder Pressure Sensor: for 17 inch Front Disc Brake (2AR-FSE)
      Front Disc Brake Pad (Type B) / Rear Disc Brake Pad (Type A)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Data List Display)

      RL W/C Sensor

      (Data List Display)
      2.78 (28.3, 403) 0.87 to 1.27 V 0.87 to 1.27 V
      4.81 (49.0, 697) 1.28 to 1.68 V 1.28 to 1.68 V
      Rear Wheel Cylinder Pressure Sensor: for 18 inch Front Disc Brake

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Data List Display)

      RL W/C Sensor

      (Data List Display)
      3.25 (33.1, 471) 0.96 to 1.36 V 0.96 to 1.36 V
      4.85 (49.5, 703) 1.29 to 1.69 V 1.29 to 1.69 V

      Tech Tips


      • If DTCs are stored due to the brake pedal being depressed, and electronically controlled brake system control is prohibited, check the Freeze Frame Data recorded at the time the DTCs were stored.

      • If the Freeze Frame Data shows that there are no abnormalities in the output of the master cylinder pressure sensors and no difference in the output between sensor 1 and sensor 2, proceed to the next step.

      • Refer to the on-vehicle inspection for the brake stroke simulator cylinder for details about the pad shapes and which pad combinations to use for the 17 inch front disc brake for vehicles with a 2AR-FSE engine Click here.


    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  4. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs Click here.

    3. Perform a road test.

    4. Check if the same DTC is recorded Click here.

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

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  5. CHECK FREEZE FRAME DATA


    1. Check the INF code from the Freeze Frame Data memorized when the DTC (C1246/46 and/or C1364/61) is stored Click here.

      Result
      Result Proceed to
      INF code (sensor power supply malfunction) is output A
      INF code (sensor output malfunction) is output B

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    REPLACE SKID CONTROL ECU ASSEMBLY Click here