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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 C123D-00: IG2 Malfunction [11/2020 - ] >> Description

DTC C123D-00: IG2 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
C123D-00 IG2 Malfunction When communication with the EV control ECU is normal or the vehicle speed is 10 km/h (6 mph) or more, and the IG1 terminal voltage is 10.2 V or more, the IG2 terminal voltage is less than 2.8 V for 4 seconds or more.
  • Open or short in IG2 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)
C123D-00 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition When communication with the EV control ECU is normal -
The vehicle speed is 10 km/h (6 mph) or more -
Malfunction Status The IG1 terminal voltage is 10.2 V or more, the IG2 terminal voltage is less than 2.8 V
Detection Time 4 seconds or more. 4 seconds or more.
Number of Trips 1 trip 1 trip

HINT: 

DTC will be output when conditions for either of the patterns in the table above are met.