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Home >> Lexus >> 2022 >> LS 500h AWD >> 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] >> Typical Malfunction Thresholds

Typical Malfunction Thresholds

C053D

Power supply voltage ratio of PMC1 and VCM1 Higher than 0.17, or less than 0.066

HINT: 

The power supply voltage ratio is the ratio of the voltage of PMC1 and VCM1.

C053E (CASE 1) AND C542 (CASE 1)

Power supply voltage ratio of PMC and VCM Less than 0.05

HINT: 

The power supply voltage ratio is the ratio of the voltage of PMC and VCM.

C053E (CASE 2) AND C0542 (CASE 2)

All of the following conditions are met -
Power supply voltage ratio of PF and VCM Less than 0.05
Power supply voltage ratio of PR and VCM Less than 0.05
Pressure sensor stuck failure detection trigger signal is met for 0.018 seconds or more Off

HINT: 

The power supply voltage ratio is the ratio of the voltage of PF and VCM or PR and VCM.

C053F (CASE 1) AND C0543 (CASE 1)

Power supply voltage ratio of PMC and VCM Higher than 0.905

HINT: 

The power supply voltage ratio is the ratio of the voltage of PMC and VCM.

C053F (CASE 2) AND C0543 (CASE 2)

All of the following conditions are met -
Power supply voltage ratio of PF and VCM Higher than 0.905
Power supply voltage ratio of PR and VCM Higher than 0.905
Pressure sensor stuck failure detection trigger signal is met for 0.018 seconds or more Off

HINT: 

The power supply voltage ratio is the ratio of the voltage of PF and VCM or PR and VCM.

C0541

Power supply voltage ratio of PMC2 and VCM2 Higher than 0.17, or less than 0.066

HINT: 

The power supply voltage ratio is the ratio of the voltage of PMC2 and VCM2.

C056B, C056C

Difference between the current master cylinder pressure and the previous master cylinder pressure Higher than 7.5 MPa (76.5 kgf/cm2 , 1088 psi) or more
C122C

Ratio of the output value of the master cylinder pressure 1 and master cylinder pressure 2 Within the invalid area (a) or invalid area (b)
GTY815182Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
C122D, C125A

Pressure sensor power supply voltage (VCM) 4.7 V or less, or 5.3 V or more
C131B (CASE 1), C132B (CASE 1), C133B (CASE 1) AND C134C (CASE 1)

Power supply voltage ratio of PWC and VCM 0.905 or less

HINT: 

The power supply voltage ratio is the ratio of the voltage of PWC and VCM.

C131B (CASE 2)

Power supply voltage ratio of PWCFL and VCM2 Higher than 0.17, or less than 0.066

HINT: 

The power supply voltage ratio is the ratio of the voltage of PWCFL and VCM2.

C131C, C132C, C133C AND C134D

Power supply voltage ratio of PWC and VCM Less than 0.05

HINT: 

The power supply voltage ratio is the ratio of the voltage of PWC and VCM.

C131D, C132D, C133D AND C134E

Power supply voltage ratio of PWC and VCM Higher than 0.905

HINT: 

The power supply voltage ratio is the ratio of the voltage of PWC and VCM.

C131E, C132E, C133E AND C134F

Wheel cylinder pressure sensor noise Valid
C131F, C132F, C1334 AND C133F

Pressure sensor power supply voltage (VCM) 4.7 V or less, or 5.3 V or more
C132B (CASE 2)

Power supply voltage ratio of PWCFR and VCM1 Higher than 0.17, or less than 0.066

HINT: 

The power supply voltage ratio is the ratio of the voltage of PWCFR and VCM1.

C133B (CASE 2)

Power supply voltage ratio of PWCRL and VCM1 Higher than 0.17, or less than 0.066

HINT: 

The power supply voltage ratio is the ratio of the voltage of PWCRL and VCM1.

C134C (CASE 2)

Power supply voltage ratio of PWCRR and VCM2 Higher than 0.17, or less than 0.066

HINT: 

The power supply voltage ratio is the ratio of the voltage of PWCRR and VCM2.

C14D6

Both of the following conditions are met -
PMC1 sensor data Invalid
PMC2 sensor data Invalid
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