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Home >> Toyota >> 2021 >> Mirai Limited >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System - Diagnostic Codes (2 Of 4) >> Electronically Controlled Brake System >> DTC C0594-00: Brake Booster Motor "A" Performance [11/2020 - ] >> Description

DTC C0594-00: Brake Booster Motor "A" Performance [11/2020 - ]: Description

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 DTC Output from Priority 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 pump assembly
  • Foreign matter enters SLA solenoid valve
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
Brake Booster B Output ECU: No. 1 skid control ECU (brake booster with master cylinder assembly)