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Home >> Lexus >> 2018 >> RX 450h Base >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Electronically Controlled Brake System (Diagnostic Codes) (7 Of 7) & Symptom Tests) >> Electronically Controlled Brake System >> DTC U0073: Control Module Communication Bus Off; DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0120: Lost Communication With Starter / Generator Control Module; 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; DTC U0128: Lost Communication With EPB Module; DTC U0140: Lost Communication with Body Control Module; DTC U0151: Lost Communication With Restraints Control Module; DTC U0293: Lost Communication With Hybrid Vehicle Control System [08/2019 - ] >> Description
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DTC U0073: Control Module Communication Bus Off; DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0120: Lost Communication With Starter / Generator Control Module; 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; DTC U0128: Lost Communication With EPB Module; DTC U0140: Lost Communication with Body Control Module; DTC U0151: Lost Communication With Restraints Control Module; DTC U0293: Lost Communication With Hybrid Vehicle Control System [08/2019 - ]: Description

The skid control ECU assembly receives signals from the hybrid vehicle control ECU assembly, steering angle sensor, parking brake ECU assembly, certification ECU (smart key ECU assembly), yaw rate and acceleration sensor, ECM assembly, airbag sensor assembly and main body ECU (multiplex network body ECU) via CAN communication.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area MIL Note
U0073 Control Module Communication Bus Off 400
401
402
405
407
410
412
  • INF Code: 400
    • Either of the following is detected:
      1. When terminal IG1 voltage is 10 V or more, data from the yaw rate sensor cannot be received for 1 second or more. (Yaw rate sensor response malfunction)
      2. When terminal IG1 voltage is 10 V or more, the condition in which data from the yaw rate sensor cannot be received once or more within 5 seconds, occurs 10 times in succession.
  • INF Code: 401
    • Either of the following is detected:
      1. When terminal IG1 voltage is 10 V or more, data from the acceleration sensor cannot be received for 1 second or more. (Acceleration sensor response malfunction)
      2. When terminal IG1 voltage is 10 V or more, the condition in which data from the acceleration sensor cannot be received once or more within 5 seconds, occurs 10 times in succession.
  • INF Code: 402
    • Either of the following is detected:
      1. When terminal IG1 voltage is 10 V or more, data from the steering angle sensor cannot be received for 1 second or more. (Steering angle sensor response malfunction)
      2. When terminal IG1 voltage is 10 V or more, the condition in which data from the steering angle sensor cannot be received once or more within 5 seconds, occurs 10 times in succession.
  • INF Code: 405, 407, 410, 412
    • CAN communication line has open or short, and cannot perform communication.
  • INF Code: 400, 401
    • CAN communication line
    • Yaw rate and acceleration sensor
    • Skid control ECU assembly
  • INF Code: 402
    • CAN communication line
    • Steering angle sensor
    • Skid control ECU assembly
  • INF Code: 405, 407, 410, 412
    • CAN communication line
    • Skid control ECU assembly
Comes on
  • INF Code 400: SAE Code U0074 (Case 5 and 6)
  • INF Code 401: SAE Code U0074 (Case 3 and 4)
  • INF Code 402: SAE Code U0074 (Case 7 and 8)
  • INF Code 405: SAE Code U0074 (Case 1)
  • INF Code 407: SAE Code U0074 (Case 9)
  • INF Code 410: SAE Code U0074 (Case 2)
  • INF Code 412: SAE Code U0074 (Case 10)
  • Electronically controlled brake system DTC
U0100 Lost Communication With ECM/PCM "A" - Either of the following is detected:
  1. ECM assembly communication is disabled for 2 seconds or more.
  2. ECM assembly communication is disabled once or more per 5 seconds 10 times or more within 60 seconds.
  • CAN communication line
  • ECM assembly
  • Skid control ECU assembly
Comes on -
U0120 Lost Communication With Starter / Generator Control Module 365 Push start switch data is invalid for 3 seconds or more.
  • CAN communication line
  • Certification ECU (Smart key ECU assembly)
  • Skid control ECU assembly
Comes on
  • INF Code 365: SAE Code U1107
  • Electronically controlled brake system DTC
U0123 Lost Communication With Yaw Rate Sensor Module 338
339
  • INF Code: 338
    • When terminal IG1 voltage is 10 V or more, data from the yaw rate sensor cannot be received for 1 second or more.
  • INF Code: 339
    • When terminal IG1 voltage is 10 V or more, the condition in which data from the yaw rate sensor cannot be received once or more within 5 seconds occurs 10 times in succession.
  • CAN communication line
  • Yaw rate sensor (Yaw rate and acceleration sensor)
  • Skid control ECU assembly
Does not come on VSC DTC
U0124 Lost Communication With Lateral Acceleration Sensor Module 319
320
  • INF Code: 319
    • When terminal IG1 voltage is 10 V or more, data from the acceleration sensor cannot be received for 1 second or more.
  • INF Code: 320
    • When terminal IG1 voltage is 10 V or more, the condition in which data from the acceleration sensor cannot be received once or more within 5 seconds occurs 10 times in succession.
  • CAN communication line
  • Acceleration sensor (Yaw rate and acceleration sensor)
  • Skid control ECU assembly
Comes on
  • INF Code 319: SAE Code U0125 (Case 2)
  • INF Code 320: SAE Code U0125 (Case 1)
  • ABS DTC
U0126 Lost Communication With Steering Angle Sensor Module 350
601
  • INF Code: 350
    • When terminal IG1 voltage is 10 V or more, data from the steering angle sensor cannot be received for 1 second or more.
  • INF Code: 601
    • When terminal IG1 voltage is 10 V or more, the condition in which data from the steering angle sensor cannot be received once or more within 5 seconds occurs 10 times in succession.
  • CAN communication line
  • Steering angle sensor
  • Skid control ECU assembly
Does not come on VSC DTC
U0128 Lost Communication With EPB Module 425 With terminal IG1 voltage at 10 V or more, data cannot be received from the electric parking brake ECU for 1 second.
  • CAN communication line
  • Parking brake ECU assembly
  • Skid control ECU assembly
Comes on
  • INF Code 425: SAE Code U1106
  • Brake hold DTC
HINT: EPB: Electric Parking Brake System
U0140 Lost Communication with Body Control Module - Main body ECU (multiplex network body ECU) communication is disabled for 2 seconds or more.
  • CAN communication line
  • Main body ECU (multiplex network body ECU)
  • Skid control ECU assembly
Comes on -
U0151 Lost Communication With Restraints Control Module 450 When terminal IG2 voltage is 9.5 V or more, data from the airbag sensor assembly cannot be received for 5 seconds or more.
  • CAN communication line
  • Airbag sensor assembly
  • Skid control ECU assembly
Does not come on Secondary collision brake DTC
U0293 Lost Communication With Hybrid Vehicle Control System 152
153
Either of the following is detected:
  1. When terminal IG2 voltage is 9.5 V or more, data from the hybrid vehicle control ECU assembly cannot be received for 2 seconds or more.
  2. When terminal IG2 voltage is 9.5 V or more, the condition in which data from the hybrid vehicle control ECU assembly cannot be received once or more within 5 seconds occurs 10 times in succession.
  • CAN communication line
  • Hybrid vehicle control ECU assembly
  • Skid control ECU assembly
Comes on
  • INF Code 152: SAE Code U0293 (Case 1)
  • INF Code 153: SAE Code U0293 (Case 2)
  • Electronically controlled brake system DTC