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Home >> Lexus >> 2021 >> LC 500 2D Coupe >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System - Diagnostic Codes (Coupe) (3 Of 4) >> Electronically Controlled Brake System >> DTC C1391: Abnormal Leak in Accumulator [09/2018 - ] >> Description

DTC C1391: Abnormal Leak in Accumulator [09/2018 - ]: Description

This DTC is stored if internal or external brake fluid leaks are detected due to improper sealing in the brake actuator assembly. Internal leaks are suspected if the pump motor operates frequently without braking.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1391 Abnormal Leak in Accumulator 591 Either of the following is detected:
  1. Accumulator pressure sensor input does not increase before braking and while the pump motor is operating.
  2. Accumulator pressure sensor input reduction rate exceeds the specification before braking and while the pump motor is not operating.
  • Brake fluid leaks
  • Brake booster with accumulator pump assembly
  • Brake actuator assembly
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