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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 C123A-00: IG1 Malfunction [11/2020 - ] >> Description

DTC C123A-00: IG1 Malfunction [11/2020 - ]: Description

Refer to DTC C110E-14.

Refer to DTC C110E-14: Brake Booster Motor "A" Supply Voltage Circuit Short to Ground or Open [11/2020 - 12/2023] , or refer to DTC C110E-14: Brake Booster Motor "A" Supply Voltage Circuit Short to Ground or Open [12/2023 - ] 

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Priority Note
C123A-00 IG1 Malfunction When the IG1 terminal voltage is less than 3.8 V, the IG2 terminal voltage is 10.2 V or more for 4 seconds or more.
  • Open or short in IG1 circuit
  • Improperly connected connector, deformation or corrosion of terminals
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
Brake Booster A Output ECU: No. 1 skid control ECU (brake booster with master cylinder assembly)