LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2021 >> LS 500h RWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/O Advanced Park) - Diagnostic Codes (1 Of 3) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Advanced Park) >> DTC C1246: Master Cylinder Pressure Sensor; DTC C1364: Wheel Cylinder Pressure Sensor [10/2020 - 10/2023] >> Description

DTC C1246: Master Cylinder Pressure Sensor; DTC C1364: Wheel Cylinder Pressure Sensor [10/2020 - 10/2023]: 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 MIL 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 less than 0.25 V or higher than 4.53 V 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 higher than 4.53 V 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 higher than 0.85 V.
  • INF Code: 200
    • When not under braking, the master cylinder pressure sensor output voltage 2 (PMC2) is less than 0.33 V or higher than 0.85 V.
  • 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
Comes on
(When only SAE code C053D, C053E, C053F, C0541, C0542, C0543, C056B, C056C, C122C, C122D, C125A or SAE code C14D6 is stored)
  • INF Code -: SAE Code C056B and C056C
  • INF Code 191: SAE Code C122D
  • INF Code 192: SAE Code C053E (Case 1 and 2) and C053F (Case 1 and 2)
  • INF Code 194: SAE Code C125A
  • INF Code 195: SAE Code C0542 (Case 1 and 2) and C0543 (Case 1 and 2)
  • INF Code 199: SAE Code C053D
  • INF Code 200: SAE Code C0541
  • INF Code 201: SAE Code C122C
  • INF Code 206: SAE Code C14D6
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
    • When not under braking, the output voltage of front wheel cylinder pressure sensor RH (PFR) is less than 0.33 V or higher than 0.85 V for 3 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
    • When not under braking, the output voltage of front wheel cylinder pressure sensor LH (PFL) is less than 0.33 V or higher than 0.85 V for 3 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
    • When not under braking, the output voltage of rear wheel cylinder pressure sensor RH (PRR) is less than 0.33 V or higher than 0.85 V for 3 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
    • When not under braking, the output voltage of rear wheel cylinder pressure sensor LH (PRL) is less than 0.33 V or higher than 0.85 V for 3 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
Comes on
(When only SAE code C131B, C131C, C131D, C131E, C131F, C132B, C132C, C132D, C132E, C132F, C1334, C133B, C133C, C133D, C133E, C133F, C134C, C134D, C134E, C134F or SAE code C14D6 is stored)
  • INF Code -: SAE Code C131E, C132E, C133E and C134F
  • INF Code 206: SAE Code C14D6
  • INF Code 221: SAE Code C132F
  • INF Code 222: SAE Code C132C and C132D
  • INF Code 224: SAE Code C132B (Case 2)
  • INF Code 225: SAE Code C132B (Case 1)
  • INF Code 227: SAE Code C131F
  • INF Code 228: SAE Code C131C and C131D
  • INF Code 230: SAE Code C131B (Case 2)
  • INF Code 231: SAE Code C131B (Case 1)
  • INF Code 233: SAE Code C1334
  • INF Code 234: SAE Code C134D and C134E
  • INF Code 236: SAE Code C134C (Case 2)
  • INF Code 237: SAE Code C134C (Case 1)
  • INF Code 239: SAE Code C133F
  • INF Code 240: SAE Code C133C and C133D
  • INF Code 242: SAE Code C133B (Case 2)
  • INF Code 243: SAE Code C133B (Case 1)
DTC DETECTION CONDITIONS: C1364 INF CODE: 224

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition Not braking ◦ ◦ -
Control operating - - ◦
Malfunction Status The front wheel RH sensor output voltage (PFR) is 0.33 V or less ◦ - -
The front wheel RH sensor output voltage (PFR) is 0.85 V or more - ◦ -
The front wheel RH sensor output voltage (PFR) is 0.33 V or less - - ◦
Detection Time 3 seconds or more 3 seconds or more 0.1 seconds or more
Number of Trips 1 trip 1 trip 1 trip
DTC DETECTION CONDITIONS: C1364 INF CODE: 230

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition Not braking ◦ ◦ -
Control operating - - ◦
Malfunction Status The front wheel RH sensor output voltage (PFL) is 0.33 V or less ◦ - -
The front wheel RH sensor output voltage (PFL) is 0.85 V or more - ◦ -
The front wheel RH sensor output voltage (PFL) is 0.33 V or less - - ◦
Detection Time 3 seconds or more 3 seconds or more 0.1 seconds or more
Number of Trips 1 trip 1 trip 1 trip
DTC DETECTION CONDITIONS: C1364 INF CODE: 236

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition Not braking ◦ ◦ -
Control operating - - ◦
Malfunction Status The front wheel RH sensor output voltage (PRR) is 0.33 V or less ◦ - -
The front wheel RH sensor output voltage (PRR) is 0.85 V or more - ◦ -
The front wheel RH sensor output voltage (PRR) is 0.33 V or less - - ◦
Detection Time 3 seconds or more 3 seconds or more 0.1 seconds or more
Number of Trips 1 trip 1 trip 1 trip
DTC DETECTION CONDITIONS: C1364 INF CODE: 242

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition Not braking ◦ ◦ -
Control operating - - ◦
Malfunction Status The front wheel RH sensor output voltage (PRL) is 0.33 V or less ◦ - -
The front wheel RH sensor output voltage (PRL) is 0.85 V or more - ◦ -
The front wheel RH sensor output voltage (PRL) is 0.33 V or less - - ◦
Detection Time 3 seconds or more 3 seconds or more 0.1 seconds or more
Number of Trips 1 trip 1 trip 1 trip