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Home >> Lexus >> 2021 >> LC 500 2D Coupe >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System - Diagnostic Codes (Coupe) (1 Of 4) >> Electronically Controlled Brake System >> DTC C1246: Master Cylinder Pressure Sensor; DTC C1364: Wheel Cylinder Pressure Sensor [09/2018 - 05/2023] >> Description

DTC C1246: Master Cylinder Pressure Sensor; DTC C1364: Wheel Cylinder Pressure Sensor [09/2018 - 05/2023]: Description

The master cylinder pressure sensors and wheel cylinder pressure sensors are built into the brake actuator assembly. They measure their respective pressures and send signals to the skid control ECU assembly.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1246 Master Cylinder Pressure Sensor -
191
192
194
195
197
198
199
200
201
202
205
206
  • INF Code: -
    • 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: 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 0.25 V or less 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 0.25 V or less 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 0.33 V or less or 0.85 V or more.
  • INF Code: 200
    • When not under braking, the master cylinder pressure sensor output voltage 2 (PMC2) is 0.33 V or less or 0.85 V or more.
  • INF Code: 201
    • PMC1 and PMC2 voltages are different when braking.
  • 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 0.25 V or less 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 0.25 V or less or 4.53 V or more continues for 0.05 seconds or more.
  • INF Code: 206
    • Both master cylinder pressure sensor output 1 (PMC1) and master cylinder pressure sensor output 2 (PMC2) power supply voltage are abnormal and 0.2 seconds or more continuously.
  • 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, 206
    • 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: 201
    • Open or short in wire harness
    • Improperly connected connector, deformation or corrosion of terminals
    • Brake actuator assembly
    • Skid control ECU assembly
    • brake master cylinder sub-assembly
  • INF Code: 202, 205
    • Open or short in master cylinder pressure sensor power supply circuit
    • Brake actuator assembly
    • Skid control ECU assembly
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C1364 Wheel Cylinder Pressure Sensor -
221
222
224
225
227
228
230
231
233
234
236
237
239
240
242
243
  • INF Code: -
    • 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: 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
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