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Home >> Lexus >> 2023 >> NX 250 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Electronically Controlled Brake System - Diagnostic Codes (5 Of 6)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HEV Model) >> DTC C13D9-09: Brake Pressure Too Low (Brake Booster) Component Failure; DTC C14EC-00: Brake Pressure Control solenoid "C" [11/2021 - ] >> Monitor Description

Monitor Description

WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. However, it is still accessible from the selected car via links, so may be relevant.

C13D9: 

  1. The No. 2 skid control ECU (brake actuator assembly) monitors the relationship between the specified increase in servo pressure and the target brake fluid pressure.

    When the brake pedal is depressed and the relationship between the servo pressure and the target brake fluid pressure is outside of the normal range, the No. 2 skid control ECU (brake actuator assembly) judges that the increasing pressure is abnormal and illuminates the MIL and stores a DTC.

C14EE: 

  1. When the brake pedal is depressed, the No. 1 skid control ECU (brake booster with master cylinder assembly) monitors the servo pressure and increases the servo pressure by driving the linear solenoid (SLA).

    When the brake pedal is depressed, if the actual servo pressure does not change even when the target servo pressure increases for a certain amount of time, the No. 2 skid control ECU (brake actuator assembly) judges that the linear solenoid (SLA) is stuck closed (the pressure increase during initial braking is abnormal) and illuminates the MIL and stores this DTC.

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