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 wheel cylinder pressure sensor are built into the brake actuator assembly. They measure their respective pressures and send signals 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 No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1246/46 Master Cylinder Pressure Sensor Malfunction

191

192

194

195

197

198

199

200

201

202

205

  • INF Code: 191


    • Sensor supply voltage 1 (VCM) is 4.7 V or less or 5.3 V or more for 0.05 seconds or more.

  • INF Code: 192


    • Master cylinder pressure sensor output voltage 1 (PMC1) is less than 0.25 V or 4.53 V or more for 0.05 seconds or more.

  • INF Code: 194


    • Sensor supply voltage 2 (VCM2) is 4.7 V or less or 5.3 V or more for 0.05 seconds or more.

  • INF Code: 195


    • Master cylinder pressure sensor output voltage 2 (PMC2) is less than 0.25 V or 4.53 V or more for 0.05 seconds or more.

  • INF Code: 197


    • Master cylinder pressure sensor output voltage 1 (PMC1) malfunction.

  • INF Code: 198


    • Master cylinder pressure sensor output voltage 2 (PMC2) malfunction.

  • INF Code: 199


    • When not under braking, the master cylinder pressure sensor output voltage 1 (PMC1) is less than 0.33 V or 0.85 V or more.

  • INF Code: 200


    • When not under braking, the master cylinder pressure sensor output voltage 2 (PMC2) is less than 0.33 V or 0.85 V or more.

  • INF Code: 201


    • Either of the following is detected:


      1. PMC1 and PMC2 voltages are different when braking.

      2. Master cylinder pressure sensor has a fluctuation of 15 MPa (153 kgf/cm2, 2176 psi) or more continuously for 0.054 seconds within a 0.6 second interval.

  • INF Code: 202


    • Condition in which the 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.

  • INF Code: 205


    • Condition in which the output voltage of front wheel cylinder pressure sensor LH (PFL) and rear wheel cylinder pressure sensor RH (PRR) is less than 0.25 V or 4.53 V or more continues for 0.05 seconds or more.

  • INF Code: 191, 194


    • Open or short in master cylinder pressure sensor power supply circuit

    • Improperly connected connector, deformation or corrosion of terminals

    • Brake actuator assembly

    • Skid control ECU assembly

  • INF Code: 192, 195, 201


    • Open or short in wire harness

    • Improperly connected connector, deformation or corrosion of terminals

    • Brake actuator assembly

    • Skid control ECU assembly

  • INF Code: 197, 198


    • Brake actuator assembly

    • Skid control ECU assembly

  • INF Code: 199, 200


    • Open or short in wire harness

    • Improperly connected connector, deformation or corrosion of terminals

    • Stop light switch assembly input

    • Brake actuator assembly

    • Skid control ECU assembly

  • INF Code: 202, 205


    • Open or short in master cylinder pressure sensor power supply circuit

    • Brake actuator assembly

    • Skid control ECU assembly

 Electronically controlled brake system DTC
C1281/81 Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC) - Detected only during Test Mode.

  • Open or short in master cylinder pressure sensor

  • Open or short in stop light switch assembly

  • Stop light switch assembly stuck off malfunction

 ABS Test Mode DTC
C1364/61 Wheel Cylinder Pressure Sensor Malfunction

221

222

224

225

227

228

230

231

233

234

236

237

239

240

242

243

  • INF Code: 221


    • Sensor supply voltage 1 (VCM1) is 4.7 V or less or 5.3 V or more for 0.05 seconds or more.

  • INF Code: 222


    • Output voltage of front wheel cylinder pressure sensor RH (PFR) is 0.25 V or less or 4.53 V or more for 0.05 seconds or more.

  • INF Code: 224


    • Either of the following is detected:


      1. When not under braking, the output voltage of front wheel cylinder pressure sensor RH (PFR) is 0.33 V or less or 0.85 V or more for 3 seconds or more.

      2. When under braking, the output voltage of front wheel cylinder pressure sensor RH (PFR) is 0.33 V or less for 0.1 seconds or more.

  • INF Code: 225


    • Output voltage of front wheel cylinder pressure sensor RH (PFR) is stuck at 4.53 V or less.

  • INF Code: 227


    • Sensor supply voltage 2 (VCM2) is 4.7 V or less or 5.3 V or more for 0.05 seconds or more.

  • INF Code: 228


    • Output voltage of front wheel cylinder pressure sensor LH (PFL) is 0.25 V or less or 4.53 V or more for 0.05 seconds or more.

  • INF Code: 230


    • Either of the following is detected:


      1. When not under braking, the output voltage of front wheel cylinder pressure sensor LH (PFL) is 0.33 V or less or 0.85 V or more for 3 seconds or more.

      2. When under braking, the output voltage of front wheel cylinder pressure sensor LH (PFL) is 0.33 V or less for 0.1 seconds or more.

  • INF Code: 231


    • Output voltage of front wheel cylinder pressure sensor LH (PFL) is stuck at 4.53 V or less.

  • INF Code: 233


    • Sensor supply voltage 2 (VCM2) is 4.7 V or less or 5.3 V or more for 0.05 seconds or more.

  • INF Code: 234


    • Output voltage of rear wheel cylinder pressure sensor RH (PRR) is 0.25 V or less or 4.53 V or more for 0.05 seconds or more.

  • INF Code: 236


    • Either of the following is detected:


      1. When not under braking, the output voltage of rear wheel cylinder pressure sensor RH (PRR) is 0.33 V or less or 0.85 V or more for 3 seconds or more.

      2. When under braking, the output voltage of rear wheel cylinder pressure sensor RH (PRR) is 0.33 V or less for 0.1 seconds or more.

  • INF Code: 237


    • Output voltage of rear wheel cylinder pressure sensor RH (PRR) is stuck at 4.53 V or less.

  • INF Code: 239


    • Sensor supply voltage 1 (VCM1) is 4.7 V or less or 5.3 V or more for 0.05 seconds or more.

  • INF Code: 240


    • Output voltage of rear wheel cylinder pressure sensor LH (PRL) is 0.25 V or less or 4.53 V or more for 0.05 seconds or more.

  • INF Code: 242


    • Either of the following is detected:


      1. When not under braking, the output voltage of rear wheel cylinder pressure sensor LH (PRL) is 0.33 V or less or 0.85 V or more for 3 seconds or more.

      2. When under braking, the output voltage of rear wheel cylinder pressure sensor LH (PRL) is 0.33 V or less for 0.1 seconds or more.

  • INF Code: 243


    • Output voltage of rear wheel cylinder pressure sensor LH (PRL) is stuck at 4.53 V or less.

  • INF Code: 221, 227, 233, 239


    • Open or short in wheel cylinder pressure sensor power supply circuit

    • Brake actuator assembly

    • Skid control ECU assembly

  • INF Code: 222, 224, 225, 228, 230, 231, 234, 236, 237, 240, 242, 243


    • Open or short in wire harness

    • Improperly connected connector, deformation or corrosion of terminals

    • Brake actuator assembly

    • Skid control ECU assembly

 Electronically controlled brake system DTC

WIRING DIAGRAM

A002156E10

CAUTION / NOTICE / HINT

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 A24 and A25 skid control ECU assembly connectors.

    3. Disconnect the A16 brake actuator assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A24-27 (VCM) - A16-35 (VCM) Always Below 1 Ω
      A24-27 (VCM) or A16-35 (VCM) - Body ground Always 10 kΩ or higher
      A24-26 (PAC1) - A16-46 (PAC1) Always Below 1 Ω
      A24-26 (PAC1) or A16-46 (PAC1) - Body ground Always 10 kΩ or higher
      A24-14 (PMC1) - A16-38 (PMC1) Always Below 1 Ω
      A24-14 (PMC1) or A16-38 (PMC1) - Body ground Always 10 kΩ or higher
      A24-44 (PFR) - A16-34 (PFR) Always Below 1 Ω
      A24-44 (PFR) or A16-34 (PFR) - Body ground Always 10 kΩ or higher
      A24-42 (PRL) - A16-36 (PRL) Always Below 1 Ω
      A24-42 (PRL) or A16-36 (PRL) - Body ground Always 10 kΩ or higher
      A24-28 (E) - A16-45 (E) Always Below 1 Ω
      A24-28 (E) or A16-45 (E) - Body ground Always 10 kΩ or higher
      A24-9 (PCK1) - A16-37 (PCK1) Always Below 1 Ω
      A24-9 (PCK1) or A16-37 (PCK1) - Body ground Always 10 kΩ or higher
      A25-28 (VCM2) - A16-40 (VCM2) Always Below 1 Ω
      A25-28 (VCM2) or A16-40 (VCM2) - Body ground Always 10 kΩ or higher
      A25-14 (PMC2) - A16-43 (PMC2) Always Below 1 Ω
      A25-14 (PMC2) or A16-43 (PMC2) - Body ground Always 10 kΩ or higher
      A25-45 (PFL) - A16-39 (PFL) Always Below 1 Ω
      A25-45 (PFL) or A16-39 (PFL) - Body ground Always 10 kΩ or higher
      A25-43 (PRR) - A16-41 (PRR) Always Below 1 Ω
      A25-43 (PRR) or A16-41 (PRR) - Body ground Always 10 kΩ or higher
      A25-44 (E2) - A16-44 (E2) Always Below 1 Ω
      A25-44 (E2) or A16-44 (E2) - Body ground Always 10 kΩ or higher
      A25-7 (PCK2) - A16-42 (PCK2) Always Below 1 Ω
      A25-7 (PCK2) or A16-42 (PCK2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A24-27 (VCM) - A16-10 (VCM) Always Below 1 Ω
      A24-27 (VCM) or A16-10 (VCM) - Body ground Always 10 kΩ or higher
      A24-26 (PAC1) - A16-15 (PAC1) Always Below 1 Ω
      A24-26 (PAC1) or A16-15 (PAC1) - Body ground Always 10 kΩ or higher
      A24-14 (PMC1) - A16-13 (PMC1) Always Below 1 Ω
      A24-14 (PMC1) or A16-13 (PMC1) - Body ground Always 10 kΩ or higher
      A24-44 (PFR) - A16-9 (PFR) Always Below 1 Ω
      A24-44 (PFR) or A16-9 (PFR) - Body ground Always 10 kΩ or higher
      A24-42 (PRL) - A16-11 (PRL) Always Below 1 Ω
      A24-42 (PRL) or A16-11 (PRL) - Body ground Always 10 kΩ or higher
      A24-28 (E) - A16-14 (E) Always Below 1 Ω
      A24-28 (E) or A16-14 (E) - Body ground Always 10 kΩ or higher
      A24-9 (PCK1) - A16-12 (PCK1) Always Below 1 Ω
      A24-9 (PCK1) or A16-12 (PCK1) - Body ground Always 10 kΩ or higher
      A25-28 (VCM2) - A16-5 (VCM2) Always Below 1 Ω
      A25-28 (VCM2) or A16-5 (VCM2) - Body ground Always 10 kΩ or higher
      A25-14 (PMC2) - A16-8 (PMC2) Always Below 1 Ω
      A25-14 (PMC2) or A16-8 (PMC2) - Body ground Always 10 kΩ or higher
      A25-45 (PFL) - A16-4 (PFL) Always Below 1 Ω
      A25-45 (PFL) or A16-4 (PFL) - Body ground Always 10 kΩ or higher
      A25-43 (PRR) - A16-6 (PRR) Always Below 1 Ω
      A25-43 (PRR) or A16-6 (PRR) - Body ground Always 10 kΩ or higher
      A25-44 (E2) - A16-16 (E2) Always Below 1 Ω
      A25-44 (E2) or A16-16 (E2) - Body ground Always 10 kΩ or higher
      A25-7 (PCK2) - A16-7 (PCK2) Always Below 1 Ω
      A25-7 (PCK2) or A16-7 (PCK2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Reconnect the A24 and A25 skid control ECU assembly connectors.

    2. Reconnect the A16 brake actuator assembly connector.

    3. Connect the GTS to the DLC3.

    4. Turn the power switch on (IG).

    5. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      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 Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed
      Master Cylinder Sensor2 Master cylinder pressure sensor 2 Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed
      ECB Solenoid (SMC1) Master cut solenoid (SMC1) ON or OFF

      ON: Solenoid on

      OFF: Solenoid off

      		 ECB: Electronically Controlled Brake System
      ECB Solenoid (SMC2) Master cut solenoid (SMC2) ON or OFF

      ON: Solenoid on

      OFF: Solenoid off

      		 ECB: Electronically Controlled Brake System

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Master Cylinder Sensor
      Master Cylinder Sensor2
      ECB Solenoid (SMC1)
      ECB Solenoid (SMC2)

    6. 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 difference in the output between sensor 1 and sensor 2, proceed to the next step.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here

    OK

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


    1. Connect an LSPV gauge set.

    2. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      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 Brake pedal released: 0.30 to 0.70 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 Brake pedal released: 0.30 to 0.70 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 Brake pedal released: 0.30 to 0.70 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 Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      FR W/C Sensor
      FL W/C Sensor
      RR W/C Sensor
      RL W/C Sensor

    3. Check the output values of the wheel cylinder pressure sensor at each hydraulic pressure level during the electronically controlled brake system control.

      Tech Tips

      Read Calibration ID using the GTS.

      Standard Voltage (Calibration ID: F1526-53182 and F1526-53192)
      for Front Wheel Cylinder (for Type A Front Brake)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Tester Display)

      FL W/C Sensor

      (Tester Display)
      3.61 (36.8, 524) 1.04 to 1.44 V 1.04 to 1.44 V
      5.36 (54.7, 777) 1.39 to 1.79 V 1.39 to 1.79 V
      for Front Wheel Cylinder (for Type B Front Brake with Solid Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Tester Display)

      FL W/C Sensor

      (Tester Display)
      3.58 (36.5, 519) 1.03 to 1.43 V 1.03 to 1.43 V
      4.77 (48.7, 692) 1.28 to 1.68 V 1.28 to 1.68 V
      for Front Wheel Cylinder (for Type B Front Brake with Ventilated Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Tester Display)

      FL W/C Sensor

      (Tester Display)
      3.09 (31.5, 448) 0.93 to 1.33 V 0.93 to 1.33 V
      4.85 (49.5, 703) 1.29 to 1.69 V 1.29 to 1.69 V
      for Rear Wheel Cylinder (for Type A Front Brake)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Tester Display)

      RL W/C Sensor

      (Tester Display)
      3.71 (37.9, 538) 1.06 to 1.46 V 1.06 to 1.46 V
      5.39 (55.0, 782) 1.40 to 1.80 V 1.40 to 1.80 V
      for Rear Wheel Cylinder (for Type B Front Brake with Solid Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Tester Display)

      RL W/C Sensor

      (Tester Display)
      3.61 (36.8, 524) 1.04 to 1.44 V 1.04 to 1.44 V
      4.85 (49.5, 703) 1.29 to 1.69 V 1.29 to 1.69 V
      for Rear Wheel Cylinder (for Type B Front Brake with Ventilated Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Tester Display)

      RL W/C Sensor

      (Tester Display)
      3.19 (32.6, 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
      Standard Voltage (Calibration ID: Except F1526-53182 and F1526-53192)
      for Front Wheel Cylinder (for Type A Front Brake)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Tester Display)

      FL W/C Sensor

      (Tester Display)
      2.83 (28.9, 410) 0.88 to 1.28 V 0.88 to 1.28 V
      3.89 (39.7, 564) 1.09 to 1.49 V 1.09 to 1.49 V
      for Front Wheel Cylinder (for Type B Front Brake with Solid Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Tester Display)

      FL W/C Sensor

      (Tester Display)
      3.05 (31.1, 442) 0.92 to 1.32 V 0.92 to 1.32 V
      4.82 (49.1, 699) 1.28 to 1.68 V 1.28 to 1.68 V
      for Front Wheel Cylinder (for Type B Front Brake with Ventilated Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      FR W/C Sensor

      (Tester Display)

      FL W/C Sensor

      (Tester Display)
      2.47 (25.2, 358) 0.80 to 1.20 V 0.80 to 1.20 V
      4.82 (49.1, 699) 1.28 to 1.68 V 1.28 to 1.68 V
      for Rear Wheel Cylinder (for Type A Front Brake)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Tester Display)

      RL W/C Sensor

      (Tester Display)
      2.78 (28.3, 403) 0.87 to 1.27 V 0.87 to 1.27 V
      3.90 (39.8, 566) 1.10 to 1.50 V 1.10 to 1.50 V
      for Rear Wheel Cylinder (for Type B Front Brake with Solid Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Tester Display)

      RL W/C Sensor

      (Tester Display)
      2.94 (30.0, 426) 0.90 to 1.30 V 0.90 to 1.30 V
      4.72 (48.1, 685) 1.26 to 1.66 V 1.26 to 1.66 V
      for Rear Wheel Cylinder (for Type B Front Brake with Ventilated Type Rear Disc)

      Hydraulic Pressure

      MPa (kgf/cm2, psi)

      RR W/C Sensor

      (Tester Display)

      RL W/C Sensor

      (Tester Display)
      2.44 (24.9, 354) 0.80 to 1.20 V 0.80 to 1.20 V
      4.75 (48.4, 689) 1.27 to 1.67 V 1.27 to 1.67 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 difference in the output between sensor 1 and sensor 2, proceed to the next step.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here

    OK

  4. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the power switch off.

    4. Turn the power switch on (READY).

    5. Perform a road test.

    6. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      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

    USE SIMULATION METHOD TO CHECK 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

    A

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here