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Home >> Lexus >> 2024 >> RC F Track Edition >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Vehicle Stability Control System - Diagnostic Codes (5 Of 5), Symptom & Circuit Tests >> Vehicle Stability Control System >> DTC U0074-88: Control Module Communication Bus "B" Off Bus Off; DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor Module Missing Message; DTC U0132-87: Lost Communication with Suspension Control Module "A" Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message [01/2023 - ] >> Description
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DTC U0074-88: Control Module Communication Bus "B" Off Bus Off; DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor Module Missing Message; DTC U0132-87: Lost Communication with Suspension Control Module "A" Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message [01/2023 - ]: Description

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

DTC No. Detection Item DTC Detection Condition Trouble Area
U0074-88 Control Module Communication Bus "B" Off Bus Off Any of the following is detected:
  • A bus OFF state occurs once or more within 0.1 seconds, 10 times in succession.
  • When the +BS terminal voltage is between 9.5 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 +BS terminal voltage is between 9.5 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
U0100-87 Lost Communication with ECM/PCM "A" Missing Message When the +BS terminal voltage is between 9.5 and 17.4 V and the vehicle speed exceeds 15 km/h (9 mph), data cannot be received from the ECM for 2 seconds or more.
  • CAN communication system
  • ECM
  • Skid control ECU (brake actuator assembly)
U0101-87 Lost Communication with TCM Missing Message When the +BS terminal voltage is between 9.5 and 17.4 V and the vehicle speed exceeds 15 km/h (9 mph), data cannot be received from the TCM (ECM) for 2 seconds or more.
  • CAN communication system
  • TCM (ECM)
  • Skid control ECU (brake actuator assembly)
U0125-87 Lost Communication with Multi-axis Acceleration Sensor Module Missing Message Either of the following is detected:
  • When the +BS terminal voltage is between 9.5 and 17.4 V, data from the acceleration sensor cannot be received for 1 second or more.
  • When the +BS terminal voltage is between 9.5 and 17.4 V, the following occurs 10 times in succession within 60 seconds:
    • Data from the acceleration sensor cannot be received once or more within 5 seconds.
  • CAN communication system
  • Acceleration sensor (yaw rate and acceleration sensor)
  • Skid control ECU (brake actuator assembly)
U0126-87 Lost Communication with Steering Angle Sensor Module Missing Message Either of the following is detected:
  • When the +BS terminal voltage is between 9.5 and 17.4 V, data from the steering angle sensor cannot be received for 1 second or more.
  • When the +BS terminal voltage is between 9.5 and 17.4 V, the following occurs 10 times in succession within 60 seconds:
    • Data from the steering angle sensor cannot be received once or more within 5 seconds
  • CAN communication system
  • Steering angle sensor
  • Skid control ECU (brake actuator assembly)
U0132-87 Lost Communication with Suspension Control Module "A" Missing Message When the +BS terminal voltage is between 9.5 and 17.4 V and the vehicle speed exceeds 15 km/h (9 mph), data cannot be received from the absorber control ECU for 1 second or more.
  • CAN communication system
  • Absorber control ECU
  • Skid control ECU (brake actuator assembly)
U0140-87 Lost Communication with Body Control Module Missing Message When the +BS terminal voltage is between 9.5 and 17.4 V and the vehicle speed is 6 km/h (4 mph) or more, data from the main body ECU (multiplex network body ECU) cannot be received for 2 seconds or more.
  • CAN communication line
  • Main body ECU (multiplex network body ECU)
  • Skid control ECU (brake actuator assembly)
DTC DETECTION CONDITIONS: U0074-88

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition When the +BS terminal voltage is between 9.5 and 17.4 V - ◦ ◦
Malfunction Status A bus OFF state occurs once or more ◦ - -
A delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor continues - ◦ -
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 10 times in succession within 60 seconds
Number of Trips 1 trip 1 trip 1 trip

HINT: 

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

DTC DETECTION CONDITIONS: U0125-87

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition When the +BS terminal voltage is between 9.5 and 17.4 V ◦ ◦
Malfunction Status Data from the acceleration sensor cannot be received ◦ -
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.

DTC DETECTION CONDITIONS: U0126-87

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition When the +BS terminal voltage is between 9.5 and 17.4 V ◦ ◦
Malfunction Status Data from the steering angle sensor cannot be received ◦ -
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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