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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 65 (Electronically Controlled Brake System (HV) - Diagnostic Codes (10 Of 11)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> DTC C14C6-16: Electronic Brake Booster Control Module "A" Supply Voltage Circuit Voltage Below Threshold [11/2023 - ] >> Monitor Description

Monitor Description

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C14C7 (Case 1): 

  1. When the voltage at IG1 or IG2 drops due to a malfunction in the auxiliary battery and hybrid control system (charging circuit), the No. 2 skid control ECU (brake actuator assembly) judges that there is a drop in the power supply and illuminates the MIL and stores a DTC.

C14C7 (Case 3): 

  1. When the ECU internal voltage is a certain value or less and the brake pedal stroke sensor assembly is invalid for a certain amount of time, the No. 2 skid control ECU (brake actuator assembly) judges that there is a drop in the power supply voltage and illuminates the MIL and stores a DTC.

C14C7 (Case 4): 

  1. When the ECU internal voltage is a certain value or less and the reaction force pressure sensor is invalid for a certain amount of time, the No. 2 skid control ECU (brake actuator assembly) judges that there is a drop in the power supply voltage and illuminates the MIL and stores a DTC.

C14C7 (Case 5 and 7): 

  1. When the ECU internal voltage and pressure sensor power supply voltage is a certain value or less for a certain amount of time, the No. 2 skid control ECU (brake actuator assembly) judges that there is a drop in the power supply voltage and illuminates the MIL and stores a DTC.

C14C7 (Case 6): 

  1. When the ECU internal voltage is a certain value or less and the servo pressure sensor is invalid for a certain amount of time, the No. 2 skid control ECU (brake actuator assembly) judges that there is a drop in the power supply voltage and illuminates the MIL and stores a DTC.

C14C7 (Case 8): 

  1. When any of the following conditions continue for a certain amount of time, the No. 2 skid control ECU (brake actuator assembly) judges that there is a drop in the power supply voltage and illuminates the MIL and stores a DTC.
    • When the ignition switch is off, the ECU internal voltage and BS monitor voltage is certain value or less.
    • When the ignition switch is ON (READY), the ECU internal voltage, BS monitor voltage and IG1 voltage is certain value or less.

C14C7 (Case 9): 

  1. When the ECU internal voltage is a certain value or less and the accumulator pressure sensor is invalid for a certain amount of time, the No. 2 skid control ECU (brake actuator assembly) judges that there is a drop in the power supply voltage and illuminates the MIL and stores a DTC.
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