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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 34 (Electronically Controlled Brake System (HV) - Diagnostic Codes (05 Of 11)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> DTC C0540-16: Brake Pressure Sensor "A" Circuit Voltage Below Threshold; DTC C0540-1F: Brake Pressure Sensor "A" Circuit Intermittent; DTC C0540-29: Brake Pressure Sensor "A" Signal Invalid; DTC C0540-31: Brake Pressure Sensor "A" No Signal; DTC C0540-96: Brake Pressure Sensor "A" Component Internal Failure; DTC C122D-16: Brake Pressure Sensor "A" Supply Voltage Circuit Voltage Below Threshold; DTC C122D-17: Brake Pressure Sensor "A" Supply Voltage Circuit Voltage Above Threshold [12/2019 - ] >> Monitor Description

Monitor Description

WARNING: This page is about a different variant/trim than selected.

C053D (Case 2): 

  1. When no abnormal pressure value is output and the master cylinder pressure sensor output is less than a certain value, the No. 2 skid control ECU (brake actuator assembly) judges that the master cylinder pressure sensor zero point is abnormal, the MIL is illuminated and a DTC is stored.

C0540 (Case 1): 

  1. When an invalid serial communication signal is detected, the No. 2 skid control ECU (brake actuator assembly) judges that communication is abnormal and illuminates the MIL and stores this DTC.

C0540 (Case 2 and 3): 

  1. When the pressure or temperature of a master cylinder pressure sensor exceeds a certain value, the No. 2 skid control ECU (brake actuator assembly) judges that the internal data is abnormal and illuminates the MIL and stores this DTC.

C0540 (Case 4): 

  1. When the master cylinder pressure sensor data is invalid, the No. 2 skid control ECU (brake actuator assembly) judges that the sensor is invalid, the MIL is illuminated and a DTC is stored.

C056B: 

  1. When the master cylinder pressure sensor is normal, the difference between the previous value and current value exceeds a certain value, the No. 2 skid control ECU (brake actuator assembly) judges that there is sensor noise, the MIL is illuminated and a DTC is stored.

C122E: 

  1. When the supply voltage of the master cylinder pressure sensor is a certain value or less, the No. 2 skid control ECU (brake actuator assembly) judges that the power supply voltage of sensor is excessively low, the MIL is illuminated and a DTC is stored.

C122F: 

  1. If any of the following conditions are met for a certain amount of time, the No. 2 skid control ECU (brake actuator assembly) judges that the power supply voltage of sensor is excessively high, and illuminates the MIL and stores this DTC.
    • The power supply voltage of the master cylinder pressure sensor is more than a certain value.
    • The temperature of the master cylinder pressure sensor is more than a certain value.
    • The supply current of the master cylinder pressure sensor is more than a certain value.
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