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Home >> Lexus >> 2020 >> GS F >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Vehicle Stability Control System - Diagnostic Codes (3 Of 3) And Symptom Tests >> Vehicle Stability Control System >> DTC U0073: Control Module Communication Bus OFF; DTC U0100: Lost Communication with ECM / PCM; DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0124: Lost Communication with Lateral Acceleration Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module [10/2015 - 09/2017] >> Description

DTC U0073: Control Module Communication Bus OFF; DTC U0100: Lost Communication with ECM / PCM; DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0124: Lost Communication with Lateral Acceleration Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module [10/2015 - 09/2017]: Description

The skid control ECU (brake actuator assembly) receives signals from the ECM, steering angle sensor and yaw rate and acceleration sensor via CAN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0073 Control Module Communication Bus OFF Any of the following is detected:
  • A bus OFF state occurs once or more within 0.1 seconds, 10 times in succession. (Sent signals cannot be received.)
  • When the IG1 terminal voltage is between 10 and 17.4 V, a delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor continues for 1 second or more.
  • When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession within 60 seconds:
    • A delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor occurs once or more within 5 seconds.
 CAN communication system
U0100 Lost Communication with ECM / PCM The IG1 terminal voltage is between 10 and 17.4 V and the vehicle speed is 15 km/h (9 mph) or more, data cannot be received from the ECM for 2 seconds or more.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • ECM
U0123 Lost Communication with Yaw Rate Sensor Module Either of the following is detected:
  • When the IG1 terminal voltage is between 10 and 17.4 V and the vehicle speed is 7 km/h (4 mph) or more, data from the yaw rate sensor cannot be received for 1 second or more.
  • When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession within 60 seconds:
    • Data from the yaw rate sensor cannot be received once or more within 5 seconds.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Yaw rate sensor (yaw rate and acceleration sensor)
U0124 Lost Communication with Lateral Acceleration Sensor Module Either of the following is detected:
  • When the IG1 terminal voltage is between 10 and 17.4 V and the vehicle speed is 7 km/h (4 mph) or more, data from the acceleration sensor cannot be received for 1 second or more.
  • When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession with in 60 seconds:
    • Data from the acceleration sensor cannot be received once or more within 5 seconds.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Acceleration sensor (yaw rate and acceleration sensor)
U0126 Lost Communication with Steering Angle Sensor Module Either of the following is detected:
  • When the IG1 terminal voltage is between 10 and 17.4 V, data from the steering angle sensor cannot be received for 1 second or more.
  • When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession with in 60 seconds:
    • Data from the steering angle sensor cannot be received once or more with in 5 seconds.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Spiral cable with sensor sub-assembly
U0073 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition - - - -
Malfunction Status A bus OFF state occurs once or more (Sent signals cannot be received.) ◦ - -
When the IG1 terminal voltage is between 10 and 17.4 V, a delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor continues - ◦ -
When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs - A delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor occurs once or more within 5 seconds. - - ◦
Detection Time Within 0.1 seconds, 10 times in succession 1 second or more. Occurs 10 times in succession within 60 seconds
Number of Trips 1 trip 1 trip 1 trip

HINT: 

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

U0123 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status When the IG1 terminal voltage is between 10 and 17.4 V and the vehicle speed is 7 km/h (4 mph) or more, data from the yaw rate sensor cannot be received ◦ -
When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs
- Data from the acceleration sensor cannot be received once or more within 5 seconds		 - ◦
Detection Time 1 second or more. 10 times in succession within 60 seconds
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.

U0124 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status When the IG1 terminal voltage is between 10 and 17.4 V and the vehicle speed is 7 km/h (4 mph) or more, data from the acceleration sensor cannot be received ◦ -
When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs
- Data from the acceleration sensor cannot be received once or more within 5 seconds		 - ◦
Detection Time 1 second or more. 10 times in succession within 60 seconds
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.

U0126 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status When the IG1 terminal voltage is between 10 and 17.4 V, data from the steering angle sensor cannot be received ◦ -
When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs
- Data from the steering angle sensor cannot be received once or more within 5 seconds		 - ◦
Detection Time 1 second or more. 10 times in succession within 60 seconds
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.

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