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Home >> Lexus >> 2017 >> IS 350 Base, AWD >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Vehicle Stability Control System - Diagnostic Codes (5 Of 5) & Symptom Tests (1 Of 2) >> 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 U0151-87: Lost Communication with Restraints Control Module Missing Message [09/2020 - ] >> 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 U0151-87: Lost Communication with Restraints Control Module Missing Message [09/2020 - ]: Description

The skid control ECU (brake actuator assembly) communicates with the following ECUs and sensors 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)
U0151-87 Lost Communication with Restraints Control Module Missing Message When the +BS terminal voltage is between 9.5 and 17.4 V and the vehicle speed exceeds 7 km/h (4 mph), data cannot be received from the airbag sensor assembly for 5 seconds or more.
  • CAN communication system
  • Airbag sensor assembly
  • 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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