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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 C0594-00: Brake Booster Motor "A" Performance [12/2019 - 11/2023] >> Description

DTC C0594-00: Brake Booster Motor "A" Performance [12/2019 - 11/2023]: Description

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

The No. 1 skid control ECU (brake booster with master cylinder assembly) detects decreases in the accumulator pressure according to the data from the accumulator pressure sensor, and then starts and stops the pump motor by operating the motor relay.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Note
C0594-00 Brake Booster Motor "A" Performance The pump motor is operating continuously for 178 seconds or more.
  • Accumulator pressure sensor malfunction
  • Wire harness and connector
  • Brake booster with accumulator pump assembly
  • Foreign matter enters SLA solenoid valve
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
Comes on
  • SAE Code: C0594
  • Output ECU: Both skid control ECUs