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Home >> Toyota >> 2017 >> Mirai >> Repair and Diagnosis (Single Page) >> Restraints >> Restraints Control Systems >> Pre-Collision System - Diagnostic Codes & Circuit Tests >> Pre-Collision System >> DTC U0125: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0293: Lost Communication with EV Control System [06/2015 - 11/2018] >> Description
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DTC U0125: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0293: Lost Communication with EV Control System [06/2015 - 11/2018]: Description

The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle. Based on this information, the driving support ECU assembly sends pre-collision system control operation signals. These DTCs are stored when a communication malfunction occurs between the sensors and ECUs that detect crashes, or between ECUs that perform the pre-collision system control.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0125 Lost Communication with Yaw Rate Sensor Module When the power switch is on (IG), a communication error between the airbag ECU assembly (yaw rate sensor) and the driving support ECU assembly is detected for approximately 3.772 seconds.
  • CAN communication system
  • Airbag ECU assembly (yaw rate sensor)
  • Driving support ECU assembly
U0126 Lost Communication with Steering Angle Sensor Module When the power switch is on (IG), a communication error between the steering sensor and the driving support ECU assembly is detected for approximately 4.76 seconds.
  • CAN communication system
  • Steering sensor
  • Driving support ECU assembly
U0129 Lost Communication with Brake System Control Module When the power switch is on (IG), a communication error between the skid control ECU (brake booster with master cylinder assembly) and the driving support ECU assembly is detected for approximately 5.24 seconds.
  • CAN communication system
  • Skid control ECU (brake booster with master cylinder assembly)
  • Driving support ECU assembly
U0142 Lost Communication with Body Control Module "B" When the power switch is on (IG), a communication error between the main body ECU (multiplex network body ECU) and driving support ECU assembly is detected for approximately 15.2 seconds.
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
  • Driving support ECU assembly
U0293 Lost Communication with EV Control System When the power switch is on (IG), a communication error between the EV control ECU and driving support ECU assembly is detected for approximately 4.808 seconds.
  • CAN communication system
  • EV control ECU
  • Driving support ECU assembly
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