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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 C1020-14: Ignition Switch On/Start Position Circuit Short to Ground or Open [12/2023 - ] >> Description

DTC C1020-14: Ignition Switch On/Start Position Circuit Short to Ground or Open [12/2023 - ]: Description

Refer to DTC C137B-A2.

Refer to DTC C137B-A2: Brake System Control Module "A" System Voltage System Voltage Low [12/2023 - ] 

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Priority Note
C1020-14 Ignition Switch On/Start Position Circuit Short to Ground or Open When the IG1 terminal voltage is less than 3 V, the IG2 terminal voltage is 9.5 V or more for 4 seconds or more.
  • Open or short in IG1 circuit
  • Improperly connected connector, deformation or corrosion of terminals
  • No. 2 skid control ECU (brake actuator assembly)
Brake/EPB A Output ECU: No. 2 skid control ECU (brake actuator assembly)