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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 136 (Electronically Controlled Brake System (HV) - Diagnostic Codes (04 Of 11)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> DTC C052C-14: ABS Pump Motor Control Circuit Short to Ground or Open; DTC C052C-16: ABS Pump Motor Control Circuit Voltage Below Threshold; DTC C052C-17: ABS Pump Motor Control Circuit Voltage Above Threshold; DTC C052C-29: ABS Pump Motor Control Signal Invalid; DTC C052C-49: ABS Pump Motor Control Internal Electronic Failure; DTC C052F-14: ABS Pump Motor Supply Voltage Circuit Short to Ground or Open [10/2021 - 11/2023] >> Monitor Description

Monitor Description

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

C052B (Case 1): 

  1. When overcurrent is detected in the motor circuit and the motor fail-safe relay gate voltage monitor is on, the No. 2 skid control ECU (brake actuator assembly) judges that there is an abnormal gate voltage, the MIL is illuminated and a DTC is stored.

C052B (Case 2): 

  1. When there is a command to turn on the reverse battery protection MOS and the reverse battery protection MOS gate voltage monitor is on, the No. 2 skid control ECU (brake actuator assembly) judges that the gate voltage is abnormal, the MIL is illuminated and a DTC is stored.

C052B (Case 3): 

  1. When the freewheeling MOS overcurrent signal is off, overcurrent is detected in the motor circuit, and the motor relay gate voltage monitor is on, the No. 2 skid control ECU (brake actuator assembly) judges that the gate voltage is abnormal, the MIL is illuminated and a DTC is stored.

C052B (Case 4 and 11): 

  1. When there is a command to turn off the motor relay, motor fail-safe relay, reverse battery protection MOS and freewheeling MOS, and any of the following conditions are met, the No. 2 skid control ECU (brake actuator assembly) judges that the gate voltage is abnormal, the MIL is illuminated and a DTC is stored.
    • The motor relay gate voltage monitor is on.
    • The motor fail-safe relay gate voltage monitor is on
    • The reverse battery protection MOS gate voltage monitor is on.
    • The freewheeling MOS gate voltage monitor is on.

C052B (Case 5, 9 and 12), C052D and C052E (Case 1, 2, 3, 4, 5, 6, 8, and 9): 

  1. When the voltage upstream or downstream of the motor is outside of the specified range, the No. 2 skid control ECU (brake actuator assembly) judges that the gate voltage is abnormal or the motor circuit is malfunctioning, the MIL is illuminated and a DTC is stored.

C052B (Case 6): 

  1. When there is a command to turn on the motor fail-safe relay and the motor fail-safe relay gate voltage monitor is off, the No. 2 skid control ECU (brake actuator assembly) judges that the gate voltage is abnormal, the MIL is illuminated and a DTC is stored.

C052B (Case 7) and C052E (Case 7): 

  1. When there is a command to turn on the freewheeling MOS and the freewheeling MOS gate voltage monitor is off, the No. 2 skid control ECU (brake actuator assembly) judges that the gate voltage is abnormal or the relay is malfunctioning, the MIL is illuminated and a DTC is stored.

C052B (Case 8): 

  1. When there is a command to turn on the motor relay and the motor relay gate voltage monitor is off, the No. 2 skid control ECU (brake actuator assembly) judges that the gate voltage is abnormal, the MIL is illuminated and a DTC is stored.

C052B (Case 10): 

  1. When there is a command to turn on the reverse battery protection MOS and the reverse battery protection MOS gate voltage monitor is off, the No. 2 skid control ECU (brake actuator assembly) judges that the gate voltage is abnormal, the MIL is illuminated and a DTC is stored.

C052B (Case 13): 

  1. When this is no history of motor power supply voltage drop, there is a command to turn on the motor fail-safe relay, and overcurrent is detected in the motor circuit, the No. 2 skid control ECU (brake actuator assembly) judges that there is overcurrent, the MIL is illuminated and a DTC is stored.

C052B (Case 14): 

  1. When there is a command to turn on the motor fail-safe relay and a command to turn off the motor relay, overcurrent is detected in the motor circuit, the No. 2 skid control ECU (brake actuator assembly) judges that there is overcurrent, the MIL is illuminated and a DTC is stored.

C052B (Case 15): 

  1. When a signal indicating overcurrent in the freewheeling MOS is detected, the No. 2 skid control ECU (brake actuator assembly) judges that there is overcurrent, the MIL is illuminated and a DTC is stored.

C052C (Case 1): 

  1. When there is a command to turn on the motor fail-safe relay, the ratio of the voltage upstream to downstream of the motor is more than a certain value, or the voltage upstream of the motor is less than a certain value, the No. 2 skid control ECU (brake actuator assembly) judges that the motor output is abnormal, the MIL is illuminated and a DTC is stored.

C052C (Case 2): 

  1. When there is a command to turn on the motor relay and motor fail-safe relay, and the pulse width modulated (PWM) wave frequency is outside the specified range, the No. 2 skid control ECU (brake actuator assembly) judges that the motor output is abnormal, the MIL is illuminated and a DTC is stored.

C052E (Case 7): 

  1. When there is a command to turn on the motor fail-safe relay and the freewheeling MOS, and the freewheeling MOS gate voltage monitor is off, the No. 2 skid control ECU (brake actuator assembly) judges that the relay is abnormal, the MIL is illuminated and a DTC is stored.

C055B: 

  1. When the voltage at terminal +BM is less than a certain value, the No. 2 skid control ECU (brake actuator assembly) judges that the motor voltage is abnormal, the MIL is illuminated and a DTC is stored.
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